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HACKING WITH SWIFT
Ready to take your first steps with app development? We have a massive curriculum that teaches Swift 5.4 with both SwiftUI and UIKit using real-world projects – all free. If you're stuck with a coding problem, we have over 600 searchable answers to common questions, code examples, and Swift tips ARRAYS - A FREE HACKING WITH SWIFT TUTORIAL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
ALGORITHMS – HACKING WITH SWIFT+ A* path finding. The A* algorithm for path finding is not the perfect way to find an optimal route between two nodes in a graph, but it is either the best or darned close most of the time and that makes it a fantastic one to learn for both games and apps alike. CUSTOMIZING BUTTON WITH BUTTONSTYLE In the process of being updated for Xcode 13.0. SwiftUI has a number of styling protocols that allow us to define common styling for views such as Button, ProgressView, Toggle, and more.They all work by allowing us to centralize any number of modifiers that get a view looking the way we want it, and provide modifiers that let us apply the full set of customizations in a single line. HOW TO RUN SOME CODE WHEN STATE CHANGES USING ONCHANGE In the process of being updated for Xcode 13.0. SwiftUI lets us attach an onChange() modifier to any view, which will run code of our choosing when some state changes in our program. This is important, because we can’t always use property observers like didSet with something like @State.. For example, this will print name changes asthey are typed:
WHAT’S THE DIFFERENCE BETWEEN FRAME AND BOUNDS? All UIView subclasses have two properties that at first glance seem similar: frame and bounds.Both return a CGRect – a rectangle containing their X and Y position, plus their width and height – but that doesn’t mean they are the same.. At its simplest, a view’s bounds refers to its coordinates relative to its own space (as if the rest of your view hierarchy didn’t exist), whereas itsEXITING LOOPS
You can exit a loop at any time using the break keyword. To try this out, let’s start with a regular while loop that counts down for a rocket launch: With that change, as soon as countDown reaches 4 the astronaut’s message will be printed, and the rest of the loop gets skipped. SAVE 50% To SCROLLVIEW EFFECTS USING GEOMETRYREADER When we use the frame(in:) method of a GeometryReader, SwiftUI will calculate the view’s current position in the coordinate space we ask for.However, as the view moves those values will change, and SwiftUI will automatically make sure GeometryReader stays updated.. Previously we used DragGesture to store a width and height as an @State property, because it allowed us to adjust other HOW TO FIX “MODIFYING STATE DURING VIEW UPDATE, THIS WILL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HOW TO DELAY AN ANIMATION SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HACKING WITH SWIFT
Ready to take your first steps with app development? We have a massive curriculum that teaches Swift 5.4 with both SwiftUI and UIKit using real-world projects – all free. If you're stuck with a coding problem, we have over 600 searchable answers to common questions, code examples, and Swift tips ARRAYS - A FREE HACKING WITH SWIFT TUTORIAL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
ALGORITHMS – HACKING WITH SWIFT+ A* path finding. The A* algorithm for path finding is not the perfect way to find an optimal route between two nodes in a graph, but it is either the best or darned close most of the time and that makes it a fantastic one to learn for both games and apps alike. CUSTOMIZING BUTTON WITH BUTTONSTYLE In the process of being updated for Xcode 13.0. SwiftUI has a number of styling protocols that allow us to define common styling for views such as Button, ProgressView, Toggle, and more.They all work by allowing us to centralize any number of modifiers that get a view looking the way we want it, and provide modifiers that let us apply the full set of customizations in a single line. HOW TO RUN SOME CODE WHEN STATE CHANGES USING ONCHANGE In the process of being updated for Xcode 13.0. SwiftUI lets us attach an onChange() modifier to any view, which will run code of our choosing when some state changes in our program. This is important, because we can’t always use property observers like didSet with something like @State.. For example, this will print name changes asthey are typed:
WHAT’S THE DIFFERENCE BETWEEN FRAME AND BOUNDS? All UIView subclasses have two properties that at first glance seem similar: frame and bounds.Both return a CGRect – a rectangle containing their X and Y position, plus their width and height – but that doesn’t mean they are the same.. At its simplest, a view’s bounds refers to its coordinates relative to its own space (as if the rest of your view hierarchy didn’t exist), whereas itsEXITING LOOPS
You can exit a loop at any time using the break keyword. To try this out, let’s start with a regular while loop that counts down for a rocket launch: With that change, as soon as countDown reaches 4 the astronaut’s message will be printed, and the rest of the loop gets skipped. SAVE 50% To SCROLLVIEW EFFECTS USING GEOMETRYREADER When we use the frame(in:) method of a GeometryReader, SwiftUI will calculate the view’s current position in the coordinate space we ask for.However, as the view moves those values will change, and SwiftUI will automatically make sure GeometryReader stays updated.. Previously we used DragGesture to store a width and height as an @State property, because it allowed us to adjust other HOW TO FIX “MODIFYING STATE DURING VIEW UPDATE, THIS WILL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HOW TO DELAY AN ANIMATION SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
100 DAYS OF SWIFT
Learn Swift by following 100 days of free tutorials. Welcome to the 100 Days of Swift! This is a free collection of videos, tutorials, tests, and more, all drawn from around my existing work here on Hacking with Swift, and all designed to help you learn Swift. WHAT’S NEW IN XCODE 13? Xcode 13 arrived at WWDC21 and includes a huge range of new features, improvements, and performance enhancements. In this article I’m going to walk you through all the key changes, so you can get up to speed quickly, but before I start I need to make two things clear: First, no, I don’t have WHAT’S NEW IN SWIFTUI FOR IOS 15 Expectations were always going to be high for SwiftUI this year, but the team didn’t disappoint – they’ve shipped a massive collection of improvements and features, including a new AsyncImage view for loading remote images, swipe actions for list rows, pull to refresh, plus shorter, simpler APIs for common uses. Alongside huge improvements to Swift itself (see What's new in Swift ALGORITHMS – HACKING WITH SWIFT+ A* path finding. The A* algorithm for path finding is not the perfect way to find an optimal route between two nodes in a graph, but it is either the best or darned close most of the time and that makes it a fantastic one to learn for both games and apps alike.INOUT PARAMETERS
All parameters passed into a Swift function are constants, so you can’t change them.If you want, you can pass in one or more parameters as inout, which means they can be changed inside your function, and those changes reflect in the original value outside the function.. For example, if you want to double a number in place – i.e., change the value directly rather than returning a new oneEXITING LOOPS
SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
UNDERSTANDING FRAMES AND COORDINATES INSIDE GEOMETRYREADER SwiftUI’s GeometryReader allows us to determine the size and coordinates of views as a function of its own size and coordinates, and it’s the key to creating some of the most remarkable effects in SwiftUI.. You should always keep in mind SwiftUI’s three-step layout system when working with GeometryReader: parent proposes a size for the child, the child uses that to determine its own size ANIMATION: INTRODUCTION SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HOW TO POSITION VIEWS IN A GRID USING LAZYVGRID AND In the process of being updated for Xcode 13.0. New in iOS 14. SwiftUI’s LazyVGrid and LazyHGrid give us grid layouts with a fair amount of flexibility. The simplest possible grid is made up of three things: your raw data, an array of GridItem describing the layout you want, and either a LazyVGrid or a LazyHGrid that brings together your data and your layout. MANUALLY PUBLISHING OBSERVABLEOBJECT CHANGES Classes that conform to the ObservableObject protocol can use SwiftUI’s @Published property wrapper to automatically announce changes to properties, so that any views using the object get their body property reinvoked and stay in sync with their data. That works really well a lot of the time, but sometimes you want a little more control and SwiftUI’s solution is called objectWillChange.HACKING WITH SWIFT
Ready to take your first steps with app development? We have a massive curriculum that teaches Swift 5.4 with both SwiftUI and UIKit using real-world projects – all free. If you're stuck with a coding problem, we have over 600 searchable answers to common questions, code examples, and Swift tips100 DAYS OF SWIFT
Learn Swift by following 100 days of free tutorials. Welcome to the 100 Days of Swift! This is a free collection of videos, tutorials, tests, and more, all drawn from around my existing work here on Hacking with Swift, and all designed to help you learn Swift. ALIGNMENT AND ALIGNMENT GUIDES SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
THE COMPLETE GUIDE TO NAVIGATIONVIEW IN SWIFTUI NavigationView is one of the most important components of a SwiftUI app, allowing us to push and pop screens with ease, presenting information in a clear, hierarchical way for users. In this article I want to demonstrate the full range of ways you can use NavigationView in your apps, including simple things like setting a title and adding buttons, but also programmatic navigation, creating SCROLLVIEW EFFECTS USING GEOMETRYREADER When we use the frame(in:) method of a GeometryReader, SwiftUI will calculate the view’s current position in the coordinate space we ask for.However, as the view moves those values will change, and SwiftUI will automatically make sure GeometryReader stays updated.. Previously we used DragGesture to store a width and height as an @State property, because it allowed us to adjust other CUSTOMIZING BUTTON WITH BUTTONSTYLE In the process of being updated for Xcode 13.0. SwiftUI has a number of styling protocols that allow us to define common styling for views such as Button, ProgressView, Toggle, and more.They all work by allowing us to centralize any number of modifiers that get a view looking the way we want it, and provide modifiers that let us apply the full set of customizations in a single line. HOW TO FIX “MODIFYING STATE DURING VIEW UPDATE, THIS WILL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
SENDING AND RECEIVING CODABLE DATA WITH URLSESSION AND iOS gives us built-in tools for sending and receiving data from the internet, and if we combine it with Codable support then it’s possible to convert Swift objects to JSON for sending, then receive back JSON to be converted back to Swift objects. Even better, when the request completes we can immediately assign its data to properties in SwiftUI views, causing our user interface to update. USING COORDINATORS TO MANAGE SWIFTUI VIEW CONTROLLERS Previously we looked at how we can use UIViewControllerRepresentable to wrap a UIKit view controller so that it can be used inside SwiftUI, in particular focusing on UIImagePickerController.However, we hit a problem: although we could show the image picker, we didn’t get notified when the user selected an image. EDITING/DELETING ITEMS FROM A LIST IN A SHEET VIEW SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HACKING WITH SWIFT
Ready to take your first steps with app development? We have a massive curriculum that teaches Swift 5.4 with both SwiftUI and UIKit using real-world projects – all free. If you're stuck with a coding problem, we have over 600 searchable answers to common questions, code examples, and Swift tips LEARN SWIFT WITH FREE TUTORIALS And that's only the free stuff. Whether you want to learn faster, jumpstart your career, take on more advanced topics, or just want to support the site, there's a100 DAYS OF SWIFT
Learn Swift by following 100 days of free tutorials. Welcome to the 100 Days of Swift! This is a free collection of videos, tutorials, tests, and more, all drawn from around my existing work here on Hacking with Swift, and all designed to help you learn Swift. ALIGNMENT AND ALIGNMENT GUIDES SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
LOADING RESOURCES FROM YOUR APP BUNDLE When we use Image views, SwiftUI knows to look in your app’s asset catalog to find the artwork, and it even automatically adjusts the artwork so it loads the correct picture for the current screen resolution – that’s the @2x and @3x stuff we looked at earlier.. For other data, such as text files, we need to do more work. This also applies if you have specific data formats such as XML or THE COMPLETE GUIDE TO NAVIGATIONVIEW IN SWIFTUI NavigationView is one of the most important components of a SwiftUI app, allowing us to push and pop screens with ease, presenting information in a clear, hierarchical way for users. In this article I want to demonstrate the full range of ways you can use NavigationView in your apps, including simple things like setting a title and adding buttons, but also programmatic navigation, creating SCROLLVIEW EFFECTS USING GEOMETRYREADER When we use the frame(in:) method of a GeometryReader, SwiftUI will calculate the view’s current position in the coordinate space we ask for.However, as the view moves those values will change, and SwiftUI will automatically make sure GeometryReader stays updated.. Previously we used DragGesture to store a width and height as an @State property, because it allowed us to adjust other HOW TO FIX “MODIFYING STATE DURING VIEW UPDATE, THIS WILL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
SENDING AND RECEIVING CODABLE DATA WITH URLSESSION AND iOS gives us built-in tools for sending and receiving data from the internet, and if we combine it with Codable support then it’s possible to convert Swift objects to JSON for sending, then receive back JSON to be converted back to Swift objects. Even better, when the request completes we can immediately assign its data to properties in SwiftUI views, causing our user interface to update. EDITING/DELETING ITEMS FROM A LIST IN A SHEET VIEW SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
100 DAYS OF SWIFT
Learn Swift by following 100 days of free tutorials. Welcome to the 100 Days of Swift! This is a free collection of videos, tutorials, tests, and more, all drawn from around my existing work here on Hacking with Swift, and all designed to help you learn Swift. LEARN SWIFT WITH FREE TUTORIALS And that's only the free stuff. Whether you want to learn faster, jumpstart your career, take on more advanced topics, or just want to support the site, there's aTEST YOUR SWIFT
It's hard to know what you don't know, so how can you figure out what holes you have in your knowledge? Simple: take the final example from the 100 Days of Swift – it's a 100-question test that covers a vast range of Swift and iOS, and will identify your weak spots in under anhour. Once you've
WHAT’S NEW IN XCODE 13? Xcode 13 arrived at WWDC21 and includes a huge range of new features, improvements, and performance enhancements. In this article I’m going to walk you through all the key changes, so you can get up to speed quickly, but before I start I need to make two things clear: First, no, I don’t have WHAT’S NEW IN SWIFTUI FOR IOS 15 Expectations were always going to be high for SwiftUI this year, but the team didn’t disappoint – they’ve shipped a massive collection of improvements and features, including a new AsyncImage view for loading remote images, swipe actions for list rows, pull to refresh, plus shorter, simpler APIs for common uses. Alongside huge improvements to Swift itself (see What's new in Swift ARRAYS - A FREE HACKING WITH SWIFT TUTORIAL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HOW TO ENABLE PULL TO REFRESH In the process of being updated for Xcode 13.0. New in iOS 15. SwiftUI’s refreshable() modifier lets you attach functionality to a List to be triggered when the user drags down far enough. iOS will automatically show an activity indicator for as long as it takes for your code to finish running.. To get started, simply add a refreshable() modifier to your list where you do your work, like this: HOW TO TAKE ACTION WHEN THE USER SUBMITS A TEXTFIELD In the process of being updated for Xcode 13.0. New in iOS 15. SwiftUI has an onSubmit() modifier that can be attached to any view in your hierarchy, and will run a function of your choose when the user has finished entering text into a TextField or SecureField.. For example, we could ask the user to enter their password, then run some code whenthey press return:
HOW TO LOAD A REMOTE IMAGE FROM A URL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HOW TO MARK CONTENT AS PRIVATE USING PRIVACYSENSITIVE SwiftUI lets us mark some parts of our view as containing sensitive information, which in practice allows us to hide or show it more easily using redaction. To use this feature in your code, first add the privacySensitive() modifier to any views that should be hidden, then apply the .redacted(reasonHACKING WITH SWIFT
Ready to take your first steps with app development? We have a massive curriculum that teaches Swift 5.4 with both SwiftUI and UIKit using real-world projects – all free. If you're stuck with a coding problem, we have over 600 searchable answers to common questions, code examples, and Swift tips100 DAYS OF SWIFT
Learn Swift by following 100 days of free tutorials. Welcome to the 100 Days of Swift! This is a free collection of videos, tutorials, tests, and more, all drawn from around my existing work here on Hacking with Swift, and all designed to help you learn Swift. LEARN SWIFT WITH FREE TUTORIALS And that's only the free stuff. Whether you want to learn faster, jumpstart your career, take on more advanced topics, or just want to support the site, there's aTEST YOUR SWIFT
It's hard to know what you don't know, so how can you figure out what holes you have in your knowledge? Simple: take the final example from the 100 Days of Swift – it's a 100-question test that covers a vast range of Swift and iOS, and will identify your weak spots in under anhour. Once you've
HOW TO RUN SOME CODE WHEN STATE CHANGES USING ONCHANGE Updated for Xcode 12.5. New in iOS 14. SwiftUI lets us attach an onChange() modifier to any view, which will run code of our choosing when some state changes in our program. This is important, because we can’t always use property observers like didSet with something like @State.. For example, this will print name changes as they are typed:EXITING LOOPS
You can exit a loop at any time using the break keyword. To try this out, let’s start with a regular while loop that counts down for a rocket launch: With that change, as soon as countDown reaches 4 the astronaut’s message will be printed, and the rest of the loop gets skipped. SAVE 50% To ALIGNMENT AND ALIGNMENT GUIDES SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
CODABLE CHEAT SHEET
Codable was one of the cornerstone features of Swift 4.0, bringing with it incredibly smooth conversion between Swift data types and JSON. It then got even better in Swift 4.1 thanks to new functionality being added, and I expect even greater things to come in the future. In this article I want to provide quick code samples to help you solve answer common questions and solve common HOW TO USE DYNAMIC MEMBER LOOKUP IN SWIFT HOW TO FIX “MODIFYING STATE DURING VIEW UPDATE, THIS WILLSWIFTUI STATE OBJECTSWIFTUI STATE BINDINGSWIFTUI CHANGE VIEWNAVIGATION VIEW SWIFTUISWIFTUI VIEW BUILDERSWIFTUI STATE INIT SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HACKING WITH SWIFT
Ready to take your first steps with app development? We have a massive curriculum that teaches Swift 5.4 with both SwiftUI and UIKit using real-world projects – all free. If you're stuck with a coding problem, we have over 600 searchable answers to common questions, code examples, and Swift tips100 DAYS OF SWIFT
Learn Swift by following 100 days of free tutorials. Welcome to the 100 Days of Swift! This is a free collection of videos, tutorials, tests, and more, all drawn from around my existing work here on Hacking with Swift, and all designed to help you learn Swift. LEARN SWIFT WITH FREE TUTORIALS And that's only the free stuff. Whether you want to learn faster, jumpstart your career, take on more advanced topics, or just want to support the site, there's aTEST YOUR SWIFT
It's hard to know what you don't know, so how can you figure out what holes you have in your knowledge? Simple: take the final example from the 100 Days of Swift – it's a 100-question test that covers a vast range of Swift and iOS, and will identify your weak spots in under anhour. Once you've
HOW TO RUN SOME CODE WHEN STATE CHANGES USING ONCHANGE Updated for Xcode 12.5. New in iOS 14. SwiftUI lets us attach an onChange() modifier to any view, which will run code of our choosing when some state changes in our program. This is important, because we can’t always use property observers like didSet with something like @State.. For example, this will print name changes as they are typed:EXITING LOOPS
You can exit a loop at any time using the break keyword. To try this out, let’s start with a regular while loop that counts down for a rocket launch: With that change, as soon as countDown reaches 4 the astronaut’s message will be printed, and the rest of the loop gets skipped. SAVE 50% To ALIGNMENT AND ALIGNMENT GUIDES SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
CODABLE CHEAT SHEET
Codable was one of the cornerstone features of Swift 4.0, bringing with it incredibly smooth conversion between Swift data types and JSON. It then got even better in Swift 4.1 thanks to new functionality being added, and I expect even greater things to come in the future. In this article I want to provide quick code samples to help you solve answer common questions and solve common HOW TO USE DYNAMIC MEMBER LOOKUP IN SWIFT HOW TO FIX “MODIFYING STATE DURING VIEW UPDATE, THIS WILLSWIFTUI STATE OBJECTSWIFTUI STATE BINDINGSWIFTUI CHANGE VIEWNAVIGATION VIEW SWIFTUISWIFTUI VIEW BUILDERSWIFTUI STATE INIT SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
ABOUT PAUL HUDSON
You can email me at paul@hackingwithswift.com or tweet me @twostraws. I'm happy to deliver talks and workshops at conferences, or be a guest on podcasts – let me know how I can help! “Programming is an art. Don't spend all your time sharpening your pencil when you should be drawing.”. PAUL HUDSON. UIACTIVITYVIEWCONTROLLER BY EXAMPLE UIKit has one main class for sharing content from our apps, and it has a flexible design that lets other services connect to it. This class, UIActivityViewController, can handle sharing text, URLs, image, and more, and is also able to add our app’s own services alongside the others. In this article I'll walk through some complete examples of using UIActivityViewController, partly so you can THE ULTIMATE GUIDE TO WKWEBVIEW WKWebView is a powerhouse on iOS, providing high-performance web rendering wherever and whenever you need.. In this article I’ve put together 15 of the most common use cases for WKWebView, and provided hands-on code solutions for each of them.So, if you want to solve a specific problem, or if you just want to see what WebKit is capableof, read on!
UNDERSTANDING FRAMES AND COORDINATES INSIDE GEOMETRYREADER SwiftUI’s GeometryReader allows us to determine the size and coordinates of views as a function of its own size and coordinates, and it’s the key to creating some of the most remarkable effects in SwiftUI.. You should always keep in mind SwiftUI’s three-step layout system when working with GeometryReader: parent proposes a size for the child, the child uses that to determine its own size COMPARISON OPERATORS Swift has several operators that perform comparison, and these work more or less like you would expect in mathematics. Let’s start with a couple of example variables so we have something to work with: SAVE 50% To celebrate WWDC21, all our books and bundles are half price, soyou can take your
HOW TO RUN CODE AFTER A DELAY USING ASYNCAFTER() AND There are two ways to run code after a delay using Swift: GCD and perform(_:with:afterDelay:), but GCD has the advantage that it can run arbitrary blocks of code, whereas the perform() method runs methods.. So, using GCD we can write something that runs code after a HOW TO DETECT IBEACONS SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
HOW TO SEND AN EMAIL SAVE 50% To celebrate WWDC21, all our books and bundles are half price, so you can take your Swift knowledge further without spending big!Get the Swift Power Pack to build your iOS career faster, get the Swift Platform Pack to builds apps for macOS, watchOS, and beyond, or get the Swift Plus Pack to learn advanced design patterns, testingskills, and more.
THE DEFER KEYWORD IN SWIFT: TRY/FINALLY DONE RIGHT The defer keyword in Swift: try/finally done right. Paul Hudson September 23rd 2019 @twostraws. Swift's defer keyword lets us set up some work to be performed when the current scope exits. For example, you might want to make sure that some temporary resources are cleaned up once a method exits, and defer will make sure that happens no matter how that exit happens. FIXING THE KEYBOARD: NOTIFICATIONCENTER Press Shift+Cmd+K to disable the hardware keyboard and use the on-screen one. Having our view adjust to the presence of a keyboard is tricky, because there are a number of situations you need to cope with. For example, various keyboards are different heights, the user can rotate their device at will, they can connect a hardware keyboardwhen
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LEARN SWIFT TODAY
Join over 40,000 readers today YOUR COMPLETE HANDS-ON GUIDE Go from zero to hero with my comprehensive, real-world Swift tutorialprojects.
-------------------------__
100% IOS 12
You can always be guaranteed you're learning the latest, greatest Apple technologies because all my tutorials are written for iOS 12.__
100% SWIFT 5.0
Don't waste time with old tutorials – all my books are written for the latest version of Swift, and come with free lifetime Swift updates.
__
100% PRACTICAL
You learn Swift while you make real-world iOS projects, which means you get to apply your new skills immediately and see them work incontext.
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100% PROVEN
Hacking with Swift is one of the most popular Swift tutorial series online, and now you can learn Swift here too – completely free! “Great to see free intro to Swift programming content that is sowell done!”
Chris Lattner, creator of SwiftWELCOME!
------------------------- My name is Paul Hudson, and I wrote Hacking with Swift to help you learn to make apps for iOS, macOS, watchOS, and more. On this site you can find my free Swift tutorials , lots of other awesome Swift books I wrote, a huge collection of Swift example code , plus Swift news, tips, and tutorials to help take your learning further. I've already helped thousands of people to learn Swift coding, and I'd love to help you too. Feel free to get in touch if you have questions – you can email me at paul@hackingwithswift.com or tweet me@twostraws .
Want to know more about me? Click here . SUBSCRIBE TO MY NEWSLETTER Get an immediate $5 off the Hacking with Swift e-book sent to your inbox, plus more discounts in the future! -------------------------Subscribe
HOW IT WORKS
------------------------- Admit it: you're thinking, "this can't be free; what's the catch?"__
START FOR FREE
I've written 40 complete iOS tutorials that teach you Swift 5.0 from scratch while you build real projects. THEY ARE ALL AVAILABLE ONLINE TO READ FOR FREE. I cover my hosting costs with adverts.__
LEARN FAST
My approach teaches you Swift programming incredibly quickly, and you end up with a HUGE LIBRARY OF FINISHED PROJECTS that are yours to develop further or ship to the App Store.__
GO FURTHER
I SELL OTHER BOOKS THAT CONTINUE TEACHING YOU SWIFT CODING. I'm confident that after you've read Hacking with Swift you'll have learned so much you want to support my work by buying a book. Programming is an art. Don't spend all your time sharpening your pencil when you should be drawing. -------------------------COURSES
------------------------- I've written a range of books that help you build your skills from beginner through to advanced. __ Need help choosing? I've written a _lot_ of books, so it can sometimes be hard to know where to start. To make things easier, I've highlighted a few common kinds of reader and recommended books for each of them. If you have further questions, don't hesitate to email me at paul@hackingwithswift.com or tweet me @twostraws.
* NEW TO SWIFT? Start with Hacking with Swiftor Swift
in Sixty Seconds . These will teach you the fundamentals of Swift and iOS development so you can get started as fast as possible. * WANT TO GROW YOUR SWIFT SKILLS? Start with Pro Swiftand Swift Design
Patterns
, then
follow up with either Advanced iOS Volume Oneor Advanced
iOS Volume Two
. You would
also benefit from Hacking with Swift Live: Series 1 , which covers a range of advanced techniques. * WANT TO GET A JOB AS AN APP DEVELOPER? Start with Pro Swiftand Swift Design
Patterns
, then
follow up with Swift Coding Challenges. You
may also need to read Objective-C for Swift Developers depending on the job. * WANT TO WORK ON OTHER PLATFORMS? I have books for macOS, watchOS
, and
tvOS , plus
two books on server-side Swift: Kituraand Vapor
.
* WANT TO LEARN FOR FREE? All of Hacking with Swift is available online for free, as is all of Swift in Sixty Seconds . You should also check out my Swift Knowledge Base , Swift coding tests , and Swiftinterview questions
– they are
all available free!
This table should help you choose a book based on your desired skilllevel:
Swift in Sixty SecondsBEGINNER
Beyond Code
BEGINNER
Dive Into SpriteKit
BEGINNER
Hacking with Swift
BEGINNER TO INTERMEDIATE Hacking with watchOS BEGINNER TO INTERMEDIATEHacking with tvOS
BEGINNER TO INTERMEDIATEHacking with macOS
BEGINNER TO INTERMEDIATEServer-Side Swift
BEGINNER TO INTERMEDIATEPro Swift
INTERMEDIATE TO ADVANCED Swift Coding Challenges INTERMEDIATE TO ADVANCED Swift Design Patterns INTERMEDIATE TO ADVANCEDTesting Swift
INTERMEDIATE TO ADVANCED Advanced iOS: Volume One INTERMEDIATE TO ADVANCED Advanced iOS: Volume Two INTERMEDIATE TO ADVANCED Objective-C for Swift DevelopersADVANCED
HACKING WITH SWIFT Start learning Swift 5.0 with the series that started it all: 1600 pages of tutorials teaching you Swift from scratch, with exclusive extra content available in the downloadedition.
LEVEL: BEGINNER – INTERMEDIATE ------------------------- Read for free __ Buy Download SWIFT IN SIXTY SECONDS Want to get started with Swift, but find yourself short on time? This course teaches you the fundamentals of Swift programming in 60-second chunks.LEVEL: BEGINNER
------------------------- Read for free __ Buy Download PRO SWIFT Watch advanced videos that will level up your Swift knowledge: functional programming, protocol-oriented programming, value types, closures, operator overloading, and more. LEVEL: INTERMEDIATE - ADVANCED -------------------------View Details __
SWIFT DESIGN PATTERNS Learn smart, idiomatic techniques to design great Swift apps, from using MVC effectively through to MVVM, delegation, protocols, and more. LEVEL: INTERMEDIATE - ADVANCED -------------------------View Details __
TESTING SWIFT If you're serious about writing great code, you need to be serious about writing great tests. Testing Swift is designed to guide you through unit tests, UI tests, TDD, and much more!LEVEL: INTERMEDIATE
-------------------------View Details __
SWIFT CODING CHALLENGES Work through real Swift coding problems that help strengthen your skills – perfect for finding and filling holes in your Swift knowledge, and preparing for iOS interviews. LEVEL: INTERMEDIATE - ADVANCED -------------------------View Details __
PRACTICAL iOS 12 Build powerful real-world projects using Apple's latest iOS – there is no faster way to get up to speed. LEVEL: INTERMEDIATE - ADVANCED -------------------------View Details __
ADVANCED iOS: VOLUME 1 Build awesome, real-world projects using APIs introduced in iOS 10, and learn about speech transcription, SiriKit, iMessage apps, the new rich media notifications, and more. LEVEL: INTERMEDIATE - ADVANCED -------------------------View Details __
ADVANCED iOS: VOLUME TWO Build powerful real-world projects using powerful technologies like Core ML, ARKit, PDFKit, drag and drop, CoreNFC, and more.
LEVEL: INTERMEDIATE - ADVANCED -------------------------View Details __
DIVE INTO SPRITEKIT Learn to build high-performance games for iPad with a unique twist: _you_ get to choose what should happen in each game. It's your game – you decide!LEVEL: BEGINNER
-------------------------View Details __
HACKING WITH macOS Power up your desktop by learning to build macOS apps – I'll teach you everything you need to know, while helping you build real-world projects that take full advantage of macOS. LEVEL: BEGINNER – INTERMEDIATE -------------------------View Details __
HACKING WITH watchOS Build powerful, useful apps for Apple's tiniest devices – this book gives you everything you need to make great apps that quite literally never leave your user's side. LEVEL: BEGINNER – INTERMEDIATE -------------------------View Details __
HACKING WITH tvOS Build for the biggest screen of all – take full advantage of the Siri remote and build incredible apps and games using UIKit, SpriteKit, and more! LEVEL: BEGINNER – INTERMEDIATE -------------------------View Details __
SERVER-SIDE SWIFT Transfer your Swift skills to the server and learn to build awesome web apps, APIs, and websites all using Swift. LEVEL: BEGINNER - INTERMEDIATE -------------------------View Details __
OBJECTIVE-C FOR SWIFT DEVELOPERS Round out your iOS coding knowledge with Apple's original language – this whole book has been designed to teach you Objective-C as quickly as possible by building on yourSwift skills.
LEVEL: ADVANCED
-------------------------View Details __
BEYOND CODE Learn the meta skills you need to be a better coder: regular expressions, Unix command line tools, Git source control, Scrum project management, and more.LEVEL: BEGINNER
-------------------------View Details __
VIDEOS Buy recordings of online video workshops that teach specific advanced topics, all in 1080p high definition – it's an incredibly convenient way to learn. LEVEL: INTERMEDIATE – ADVANCED -------------------------View Details __
MERCHANDISE Buy some Swift-themed gifts for yourself or your favorite programmer friend and you'll learn Swift faster. Probably.LEVEL: ALL
-------------------------View Details __
REVIEWS
------------------------- “The projects in this course are created in a way to expose you to real-world code – very practical and extensible! Highlyrecommended.”
__ __ __ __ __
MARC AUPONT on _Hacking with Swift_ “Just finished reading Swift Design Patterns. It's awesome, just like other books by Paul. It helped me a lot to understand some iOSaspects deeply.”
__ __ __ __ __
ANTON NOVOSELOV on _Swift DesignPatterns_
“Paul's is a warranty of quality. He writes books at a speed that always surprises me for its timing and effectiveness. This book represents all that!”__ __ __ __ __
MARIO ESPOSITO on _Hacking withwatchOS_
“I'm a huge fan of Paul Hudson – more than an in-depth source of technical information, its super easy to understand and learning from him is inspiring!”__ __ __ __ __
JULIO RYUUZAKI on _Hacking withmacOS_
“Paul Hudson is a Swift community treasure. I regularly turn to Pro Swift and Paul's other books for reference and inspiration. Thankyou!”
__ __ __ __ __
JOHN GALLAUGHER on _Pro Swift_ “I love the work Paul does. He has a real talent for making complex topics obtainable, fun, and engaging!”__ __ __ __ __
CALEB BASINGER on _Hacking withSwift_
“The entire Hacking with Swift series is great! Swift Coding Challenges forces me to think abstractly and dig into the code morethan ever.”
__ __ __ __ __
DAN O’LEARY on _Swift CodingChallenges_
“Paul's book does an amazing job teaching beginners how to use server-side Swift in an effective, testable, efficient way.”__ __ __ __ __
JIMMY MCDERMOTT on _Server-Side Swift_Read More __
FAQ
Q: WILL I GET UPDATES WHEN NEW SWIFT VERSIONS ARE RELEASED? A: Yes! Your purchase is covered by the most awesome book updates policy in existence: books get updates for new Swift versions completely free, for the life of the book. Click here to read my book update policy in full . Q: WHAT VERSION OF SWIFT DO YOU USE IN YOUR COURSES? A: I use Xcode 10 and Swift 5.0 in all books, except for Objective-C for Swift Developers – that uses Objective-C, obviously. Q: I'M A BEGINNER – WHAT BOOKS ARE SUITABLE FOR ME? A: No matter what your level of Swift experience, I've got a book to help you learn. This should help you decide where to start: Swift in Sixty SecondsBEGINNER
Beyond Code
BEGINNER
Dive Into SpriteKit
BEGINNER
Hacking with Swift
BEGINNER TO INTERMEDIATE Hacking with watchOS BEGINNER TO INTERMEDIATEHacking with tvOS
BEGINNER TO INTERMEDIATEHacking with macOS
BEGINNER TO INTERMEDIATEServer-Side Swift
BEGINNER TO INTERMEDIATEPro Swift
INTERMEDIATE TO ADVANCED Swift Coding Challenges INTERMEDIATE TO ADVANCED Swift Design Patterns INTERMEDIATE TO ADVANCEDTesting Swift
INTERMEDIATE TO ADVANCED Advanced iOS: Volume One INTERMEDIATE TO ADVANCED Advanced iOS: Volume Two INTERMEDIATE TO ADVANCED Objective-C for Swift DevelopersADVANCED
Q: WHY SHOULD I BUY YOUR BOOKS RATHER THAN SOMEONE ELSE'S? A: My books form the most comprehensive project-based Swift tutorials in existence, but if you're looking for something a bit extra then there are three things you should know: * All books come with a Lifetime Swift Update Policy , so you can buy with confidence knowing you'll get updates for free in the future. * My Swift Frequent Flyer Club delivers rewards for readers who buy multiple books – there's a growing library of bonus content to enjoy! * All books you buy come with a completion certificate so you can track your career development progress. I consider it a privilege that so many readers choose my books when there are so many others out there, and I want to make sure I always deliver above your expectations. Q: HOW CAN I READ HACKING WITH SWIFT OFFLINE / WITHOUT ADS? A: You can buy the premium Hacking with Swift book set for just $40. You get the same projects you can find online here, as well as 600 tips and tricks from my Swift Knowledge Base, and more. Q: I CAN ALREADY PROGRAM SWIFT – WILL YOU TEACH ME NEW STUFF? A: I wrote a separate book and video course called Pro Swift which teaches advanced Swift coding. It covers functional programming, MVVM, reference and value types, closures, operator overloading, and much more, and includes 96 videos walking you through the techniques. While Hacking with Swift definitely touches on more advanced topics as you proceed, Pro Swift is all advanced, all thetime.
NOTE: You don't need to have read Hacking with Swift in order to get the most out of Pro Swift, but it certainly helps! Q: IS KNOWING SWIFT ENOUGH? DO I ALSO NEED TO KNOW OBJECTIVE-C? A: It's true that most iOS jobs want some Objective-C knowledge, because there are over a million apps written in the language. To help you learn, I wrote a book called Objective-C for Swift Developers , which is designed to help you transfer your skills from Swift to Objective-C as quickly aspossible.
Q: DO ANY OF YOUR BOOKS OVERLAP? A: No – they are all designed to be unique, standalone books. Q: CAN I BUY YOUR BOOKS ON IBOOKS? A: Yes, you can buy my books on the iBooks Store. For more information and links to the full range, click here . Please note: If you buy the original Hacking with Swift book through iBooks you don't get the bonus content, because it's not compatible with the iBooks Store. If you want the bonus content please click here to buy through Gumroad . Q: DO YOU OFFER ANY DISCOUNTS? A: I try to keep my books priced as low as possible; if you look around, you'll find other courses sell for twice as much, despite offering far less content. However, if you sign up to my monthly Swift newsletter you'll get discountsevery month.
If you're looking for the biggest discount of all, see the very nextquestion…
Q: CAN I BUY YOUR BOOKS IN A BUNDLE? A: Yes, and the bundles are a great way to save even more money on mylow prices:
* My first six books are available in the Swift Power Pack at a big discount – you get all six for just $150, which is a 32% saving on their regular price. * The next six books are available in the Swift Platform Pack , also for $150, which is a 37% saving on their regular price. Even better, if you buy any of the books from a bundle individually, you can upgrade to the full bundle at a later date just by paying the difference – email me and I can generate the discount for you. Q: WHAT IS THE SWIFT FREQUENT FLYER CLUB YOUR BOOKS TALK ABOUT? A: Everyone who buys any of my books gets access to bonus content as part of my Swift Frequent Flyer Club. Click here to claim yours! Q: WILL YOU COME AND SPEAK AT MY CONFERENCE / USER GROUP / PODCAST? A: I'm happy to deliver talks and short sessions at conferences and user groups, although you'll need to cover my travel costs from the UK. I also run hands-on Swift training courses lasting from one day to five days – please email paul@hackingwithswift.com and let me knowwhat you need.
I'm always happy to speak on podcasts about Swift, iOS, macOS, or other similar topics – get in touch! Q: WHAT ARE "PULP FICTION BRACKETS"? A: Pulp Fiction brackets are < and >, also known as "angle brackets." Q: WHY DO YOU INSIST ON TEACHING USING PROJECTS? This series has been built on the back of my personal motto: "Programming is an art. Don't spend all your time sharpening your pencil when you should be drawing." We'll be doing some "sharpening" but a heck of a lot more "drawing" – if that doesn't suit your way of learning, Hacking with Swift isn't for you. Q: WHAT SHOULD I DO IF I SPOT A MISTAKE? A: If it's a typo or a coding error, please do email me at paul@hackingwithswift.com or find me on Twitter @twostraws . However, please keep in mind that these projects were designed to be simple and digestible learning examples, not fool-proof, App Store-ready perfections. That means sometimes there are bugs that exist because some longer or more difficult code has been removed or simplified – you're welcome to fix these in your own projects, but I think it would just confuse learners to fix them here. Q: DOES HACKING WITH SWIFT HAVE ANY FIREFLY REFERENCES? I WANT FIREFLY REFERENCES. WHERE ARE THE FIREFLY REFERENCES? A: They are, quite literally, all in the official Swift reference fromApple. Shiny!
Click here to visit the Hacking with Swift store >>__
@twostraws
__
paul@hackingwithswift.com Swift, the Swift logo, Xcode, Instruments, Cocoa Touch, Touch ID, AirDrop, iBeacon, iPhone, iPad, Safari, App Store, watchOS, tvOS, Mac and macOS are trademarks of Apple Inc., registered in the U.S. and other countries. Pulp Fiction is copyright © 1994 Miramax Films. Hacking with Swift is ©2019 Paul Hudson.Privacy Policy
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