An iOS Developer's Guide to SwiftUI: Design and build beautiful apps quickly and easily with minimum code

Cover....1 Title Page....2 Copyright and Credits....2 Contributors....4 Table of Contents....8 Preface....16 Part 1: Simple Views....24 Chapter 1: Exploring the Environment – Xcode, Playgrounds, and SwiftUI....26 Technical requirements....27 Exploring SwiftUI with Xcode....27 A brief tour of Xcode....27 Your first SwiftUI project....41 Creating a SwiftUI project....41 Creating a multi-platform project....45 Previews and the simulator....48 Playgrounds....52 The app submission process....55 Certificates....55 Mobile provisioning profiles....56 The application submission process....57 Summary....59 Chapter 2: Adding Basic UI Elements and Designing Layouts....60 Technical requirements....60 Reusing views code....60 More about Text....66 Managing space in SwiftUI....68 The padding modifier....68 The .frame modifier....69 The .alignment modifier....70 The Spacer....74 The Divider....77 Digging deeper into stacks....78 Overview of stacks....78 HStack....81 ZStack....81 Summary....87 Chapter 3: Adding Interactivity to a SwiftUI View....88 Technical requirements....89 Passing values at view creation....89 Responding to a button tap....90 Property wrappers....93 Limitations of @State....94 Changing a view appearance dynamically using modifiers....96 Bidirectional binding with Picker....99 Final notes on Subviews and @Binding, Classes, and @ObservableObject....101 Summary....106 Part 2: Scrollable Views....108 Chapter 4: Iterating Views, Scroll Views, FocusState, Lists, and Scroll View Reader....110 Technical requirements....110 Iterating views....110 Hiding or showing the keyboard in a form using @FocusState....117 Scroll views....119 Controlling scrolling programmatically using ScrollViewReader....123 Summary....127 Chapter 5: The Art of Displaying Grids....128 Technical requirements....128 Displaying grids in iOS....129 The Grid view....129 Creating a simple static grid....134 Lazy grids....139 Using GridItem to control the layout of LazyVGrid....142 Scrolling horizontally and sizing the grid automatically....143 Conditional formatting of a view....144 Reacting to device rotation....147 Summary....149 Part 3: SwiftUI Navigation....150 Chapter 6: Tab Bars and Modal View Presentation....152 Technical requirements....152 Creating a standard tab bar....152 Creating custom tab bars....159 Adapting your code to different versions of the operating system....167 The hitchhiker’s guide to modal navigation....168 Showing a modal sheet....168 Showing alerts....173 The popover....175 Presentation detents....179 Summary....181 Chapter 7: All About Navigation....182 Technical requirements....182 Navigation as a concept in iOS and other platforms....182 Showing a tab bar title with NavigationView....184 Presenting views with NavigationLink (pre-iOS 16)....186 Adding buttons to NavigationView and activating navigation programmatically....189 Using navigationDestination with NavigationStack....195 Using NavigationPath to control the navigation stack....197 NavigationSplitView – multicolumn navigation....200 Direct navigation stack manipulation with NavigationPath....204 Saving and loading the navigation stack....207 Summary....210 Part 4: Graphics and Animation....212 Chapter 8: Creating Custom Graphics....214 Technical requirements....214 Creating custom modifiers....214 Drawing with the Canvas....218 Using CALayers in SwiftUI....224 Custom layout....227 Summary....230 Chapter 9: An Introduction to Animations in SwiftUI....232 Technical requirements....233 Gestures....233 Basic gestures....233 Creating implicit animations....236 Explicit SwiftUI animations....239 Transitions....245 The .transition() modifier....246 The matchedGeometryEffect modifier....249 Summary....252 Part 5: App Architecture....254 Chapter 10: App Architecture and SwiftUI Part I: Practical Tools....256 Diagrams....257 Dependency inversion....258 Clean Architecture....264 Different ways to decouple....267 Initializer injection....268 Method injection....269 Property injection....270 A matter of state....271 iOS 17 changes in state management....274 Other ways to chop your code....275 Summary....277 Chapter 11: App Architecture and SwiftUI Part II – the Theory....278 Keeping it light enough....279 Conflict and the role of the architect....283 What good software architecture is and what it is not....287 Don’t be shy; ask an expert!....290 The origin of software patterns....294 Agency theory and bad architecture....296 Clean Architecture....297 TCA, The Composable Architecture....301 Summary....304 Part 6: Beyond Basics....306 Chapter 12: Persistence with Core Data....308 What is persistency?....308 What is Core Data?....312 Understanding Core Data framework classes....314 Using Core Data with SwiftUI....316 Creating a Core Data project....317 Working with the data model file....325 Core Data migrations....329 The SQLite data file....331 CloudKit....334 Summary....335 Chapter 13: Modern Structured Concurrency....336 A brief introduction to concurrency....337 Understanding traditional concurrency mechanisms....338 Threads....338 Callbacks and event loops....339 GCD....339 What is structured concurrency?....340 Using the async/await syntax....341 Understanding tasks....348 Task groups....350 Asynchronous streams....358 Actors....363 MainActor....365 Bridging old GCD and structured concurrency....368 Summary....369 Chapter 14: An Introduction to SwiftData....370 Technical requirements....371 Understanding the differences between SwiftData and Core Data....371 SwiftData and SwiftUI....372 Exploring changes in the binding mechanisms....373 Creating a data model....377 Understanding relationships in SwiftData....383 One-to-one relationships....383 One-to-many relationships....384 Many-to-one relationships....384 Many-to-many relationships....385 Cascading deletion rules....386 Fetching data....386 Filtering data with predicates....386 Summary....387 Chapter 15: Consuming REST Services in SwiftUI....388 Technical requirements....389 An overview of REST....389 Ports....396 Understanding REST requests in Swift....396 Codable, Encodable, and Decodable protocols....398 Using URLSession....403 Implementing HTTP methods....404 Setting headers....404 Handling errors....405 URLProtocol....411 Summary....415 Chapter 16: Exploring the Apple Vision Pro....416 Technical requirements....416 Tools for visionOS development....417 An overview of Unity and RealityKit....418 First steps with visionOS development....421 Summary....433 Index....434 Other Books You May Enjoy....443