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2 views160 pages

Swiftui by Tutorials Declarative App Development On The Apple Ecosystem 4Th Edition Antonio Bello Newest Edition 2025

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© © All Rights Reserved
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SwiftUI by Tutorials SwiftUI by Tutorials

SwiftUI by Tutorials
By Antonio Bello, Bill Morefield, Audrey Tam & Sarah Reichelt

Copyright ©2021 Razeware LLC.

Notice of Rights
All rights reserved. No part of this book or corresponding materials (such as text,
images, or source code) may be reproduced or distributed by any means without
prior written permission of the copyright owner.

Notice of Liability
This book and all corresponding materials (such as source code) are provided on an
“as is” basis, without warranty of any kind, express of implied, including but not
limited to the warranties of merchantability, fitness for a particular purpose, and
noninfringement. In no event shall the authors or copyright holders be liable for any
claim, damages or other liability, whether in action of contract, tort or otherwise,
arising from, out of or in connection with the software or the use of other dealing in
the software.

Trademarks
All trademarks and registered trademarks appearing in this book are the property of
their own respective owners.

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SwiftUI by Tutorials

Table of Contents: Overview


Book License ............................................................................................. 13
Before You Begin ................................................................ 14
What You Need ........................................................................................ 15
Book Source Code & Forums ............................................................. 16
Section I: Diving Into SwiftUI ......................................... 20
Chapter 1: Introduction ........................................................... 21
Chapter 2: Getting Started ..................................................... 24
Chapter 3: Diving Deeper Into SwiftUI.............................. 53
Chapter 4: Testing & Debugging ........................................... 84
Section II: Building Blocks of SwiftUI ........................ 112
Chapter 5: Intro to Controls: Text & Image ................... 113
Chapter 6: Controls & User Input ..................................... 156
Chapter 7: Introducing Stacks & Containers ................ 206
Section III: State & Data Flow ...................................... 249
Chapter 8: State & Data Flow — Part I ............................ 250
Chapter 9: State & Data Flow – Part II ............................ 279
Chapter 10: More User Input & App Storage ............... 304
Chapter 11: Gestures ............................................................. 351
Chapter 12: Accessibility ...................................................... 379
Section IV: Navigation & Data Display...................... 422
Chapter 13: Navigation ......................................................... 423

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Chapter 14: Lists ...................................................................... 454


Chapter 15: Advanced Lists ................................................. 481
Chapter 16: Grids .................................................................... 503
Chapter 17: Sheets & Alert Views ..................................... 522
Section V: UI Extensions ................................................ 544
Chapter 18: Drawing & Custom Graphics...................... 545
Chapter 19: Animations & View Transitions ................. 577
Chapter 20: Complex Interfaces ........................................ 615
Section VI: SwiftUI for macOS..................................... 643
Chapter 21: Building a Mac App ........................................ 644
Chapter 22: Converting an iOS App to macOS ............ 674
Conclusion .............................................................................................. 705

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Table of Contents: Extended


Book License . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
What You Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Book Source Code & Forums . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
About the Authors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
About the Editors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Section I: Diving Into SwiftUI . . . . . . . . . . . . . . . . . . . . . . 20


Chapter 1: Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Book structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
About this book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Chapter 2: Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Creating your UI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Updating the UI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Making reusable views. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Presenting an alert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Making it prettier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Challenge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Chapter 3: Diving Deeper Into SwiftUI . . . . . . . . . . . . . . . . . . . . . . 53
Views and modifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Neumorphism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Creating a neumorphic button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Creating a beveled edge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
“Debugging” dark mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Modifying font . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

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Adapting to the device screen size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78


Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Chapter 4: Testing & Debugging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Different types of tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Debugging SwiftUI apps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Adding UI tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Creating a UI Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Accessing UI elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Reading the user interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Fixing the bug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Adding more complex tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Simulating user interaction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Testing multiple platforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Debugging views and state changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
Challenge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Section II: Building Blocks of SwiftUI . . . . . . . . . . . . . 112


Chapter 5: Intro to Controls: Text & Image . . . . . . . . . . . . . . . . . 113
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
Brief overview of stack views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
More on Image . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
Splitting Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Label: Combining Image and Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Chapter 6: Controls & User Input . . . . . . . . . . . . . . . . . . . . . . . . . . 156
A simple registration form. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

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Creating the registration view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164


Power to the user: the TextField . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Taps and buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Toggle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Handling the Focus and the Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Other controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Chapter 7: Introducing Stacks & Containers . . . . . . . . . . . . . . . 206
Layout and priorities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Stack views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
Back to Kuchi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
The Lazy Stacks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

Section III: State & Data Flow . . . . . . . . . . . . . . . . . . . . . 249


Chapter 8: State & Data Flow — Part I . . . . . . . . . . . . . . . . . . . . . 250
MVC: The Mammoth View Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
A functional user interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
State . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254
Using binding for two-way reactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278
Chapter 9: State & Data Flow – Part II . . . . . . . . . . . . . . . . . . . . . 279
The art of observation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280
Sharing in the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284
Object Ownership . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
Understanding environment properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

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Chapter 10: More User Input & App Storage. . . . . . . . . . . . . . . 304


Creating the Settings View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305
The Stepper Component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 310
The Toggle Component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
The Date Picker Component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315
The Color picker component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
The picker component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 328
The tab bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
App storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 340
SceneStorage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Chapter 11: Gestures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Adding the learn feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 352
Your first gesture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369
Custom gestures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Combining gestures for more complex interactions . . . . . . . . . . . . . . . . 375
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378
Chapter 12: Accessibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379
Using VoiceOver on a device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380
Accessibility in SwiftUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384
Accessibility API . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386
RGBullsEye . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
Adapting to user settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
Kuchi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401
MountainAirport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414
Truly testing your app’s accessibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421

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Section IV: Navigation & Data Display . . . . . . . . . . . . 422


Chapter 13: Navigation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 423
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
Navigating through a SwiftUI app . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424
Creating navigation views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 426
Polishing the links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 432
Using navigation links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 434
Extending the hierarchy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 436
Adding items to the navigation bar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438
Navigation via code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441
Sharing the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
Using tabbed navigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 447
Setting tabs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 449
Setting tab badges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 451
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 453
Chapter 14: Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 454
Iterating through data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 455
Making your data work better with iteration . . . . . . . . . . . . . . . . . . . . . . . 458
Improving performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460
Setting the scroll position in code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462
Creating lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 466
Building search results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468
Building a hierarchical list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 471
Grouping list items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480
Chapter 15: Advanced Lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481
Adding swipe actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 482
Pull to refresh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 487

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SwiftUI by Tutorials

Updating views for time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 492


Searchable lists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502
Chapter 16: Grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503
Building grids the original way . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 504
Creating a fixed column grid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507
Building flexible grids. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509
Interacting between views and columns . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512
Building adaptive grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515
Using sections in grids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521
Chapter 17: Sheets & Alert Views . . . . . . . . . . . . . . . . . . . . . . . . . . 522
Displaying a modal sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523
Programmatically dismissing a modal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525
Creating an alert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 528
Adding an action sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 531
Using alerts as action sheets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 536
Showing a popover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 540
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 543
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 543

Section V: UI Extensions . . . . . . . . . . . . . . . . . . . . . . . . . . 544


Chapter 18: Drawing & Custom Graphics . . . . . . . . . . . . . . . . . . 545
Using shapes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546
Using GeometryReader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 554
Using gradients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 556
Adding grid marks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559
Using paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 561
Building the pie chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 564

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Adding a legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567


Fixing performance problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 570
Drawing high-performance graphics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 571
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 575
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 576
Chapter 19: Animations & View Transitions . . . . . . . . . . . . . . . 577
Animating state changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 578
Adding animation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 579
Animation types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 582
Eased animations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 584
Spring animations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 586
Removing and combining animations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 589
Animating from state changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 591
Animating shapes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 592
Cascading animations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 594
Extracting animations from the view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 595
Animating paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 596
Animating view transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600
Linking view transitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 605
Making Canvas animations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 614
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 614
Chapter 20: Complex Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . 615
Building reusable views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 616
Showing flight progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 619
Adding inline drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 621
Using keypaths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 629
Using the timeline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 632
Integrating with other frameworks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 634
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642
Where to go from here . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 642

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SwiftUI by Tutorials

Section VI: SwiftUI for macOS . . . . . . . . . . . . . . . . . . . . 643


Chapter 21: Building a Mac App . . . . . . . . . . . . . . . . . . . . . . . . . . . . 644
The default document app . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645
Setting up the app for Markdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 646
Markdown and HTML . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650
Adding the HTML preview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 652
Adding a settings window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 657
Changing and creating menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 660
Creating a toolbar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664
Markdown in AttributedStrings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 670
Installing the app . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 672
Challenge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 672
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 673
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 673
Chapter 22: Converting an iOS App to macOS . . . . . . . . . . . . . 674
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 675
Setting up the Mac app . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 676
Fixing the build errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 679
Styling the sidebar . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 683
NavigationViews in macOS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 686
Displaying the data views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 688
Flight Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 692
Searching for flights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 695
Last viewed flight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 698
Awards view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 699
Flight Timeline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 703
Challenge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 703
Key points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704
Where to go from here? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 704
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705

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L Book License

By purchasing SwiftUI by Tutorials, you have the following license:

• You are allowed to use and/or modify the source code in SwiftUI by Tutorials in as
many apps as you want, with no attribution required.

• You are allowed to use and/or modify all art, images and designs that are included
in SwiftUI by Tutorials in as many apps as you want, but must include this
attribution line somewhere inside your app: “Artwork/images/designs: from
SwiftUI by Tutorials, available at www.raywenderlich.com”.

• The source code included in SwiftUI by Tutorials is for your personal use only. You
are NOT allowed to distribute or sell the source code in SwiftUI by Tutorials
without prior authorization.

• This book is for your personal use only. You are NOT allowed to sell this book
without prior authorization, or distribute it to friends, coworkers or students; they
would need to purchase their own copies.

All materials provided with this book are provided on an “as is” basis, without
warranty of any kind, express or implied, including but not limited to the warranties
of merchantability, fitness for a particular purpose and noninfringement. In no event
shall the authors or copyright holders be liable for any claim, damages or other
liability, whether in an action or contract, tort or otherwise, arising from, out of or in
connection with the software or the use or other dealings in the software.

All trademarks and registered trademarks appearing in this guide are the properties
of their respective owners.

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Before You Begin

This section tells you a few things you need to know before you get started, such as
what you’ll need for hardware and software, where to find the project files for this
book, and more.

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i What You Need

To follow along with this book, you’ll need the following:

• A Mac running macOS Monterey (12.0) or later.

• Xcode 13.1 or later. Xcode is the main development tool for iOS. You’ll need
Xcode 13.1 or later to make use of SwiftUI and the latest features explained
throughout the book. You can download the latest version of Xcode from Apple’s
developer site here: apple.co/2asi58y — If you have an Apple Developer account,
you can also download any Xcode version here: apple.co/3GWcz96.

Note: The code covered in this book was developed and tested with Swift 5.5,
macOS Monterey and Xcode 13.1 — so even though you can work with slightly
earlier versions of them, we encourage you to update to those versions to
follow along the book without unexpected errors.

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ii Book Source Code &
Forums

Where to download the materials for this book


The materials for this book can be cloned or downloaded from the GitHub book
materials repository:

• https://github.com/raywenderlich/sui-materials/tree/editions/4.0

Forums
We’ve also set up an official forum for the book at https://
forums.raywenderlich.com/c/books/swiftui-by-tutorials. This is a great place to ask
questions about the book or to submit any errors you may find.

raywenderlich.com 16
SwiftUI by Tutorials About the Team

About the Authors


Antonio Bello is an author of this book. Antonio has spent most of
his life writing code, and he’s gained a lot of experience in several
languages and technologies. A few years ago he fell in love with
iOS development, and that’s what he mostly works on since then,
although he’s always open for challenges and for playing with new
toys. He believes that reputation is the most important skill in his
job, and that “it cannot be done” actually means “it can be done,
but it’s not economically convenient.” When he’s not working, he’s
probably playing drums or making songs in his small, but well
fitted, home recording studio.

Bill Morefield is an author of this book. Bill has spent most of his
professional life writing code. At some point he has worked in
almost every language other than COBOL. He bought his first
Apple computer to learn to program for the iPhone and got hooked
on the platform. He manages the web and mobile development
team for a college in Tennessee, where he still gets to write code.
When not attached to a keyboard he enjoys hiking and
photography.

Audrey Tam is an author of this book. As a retired computer


science academic, she’s a technology generalist with expertise in
translating new knowledge into learning materials. Audrey now
teaches short courses in iOS app development to non-
programmers, and attends nearly all Melbourne Cocoaheads
monthly meetings. She also enjoys long train journeys, knitting,
and trekking in the Aussie wilderness.

Sarah Reichelt is an author of this book. She got hooked onto


trying to make computers do what she told them a very long time
ago and has never stopped loving it. She was inspired by Swift and
now by SwiftUI to learn a new approach to this, and is a keen
evangelist for developing Mac apps. When not at her computer,
Sarah loves coffee, puzzles, reading and cooking - the day hasn’t
started until the first cup of coffee is drunk and the crossword is
done!

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SwiftUI by Tutorials About the Team

About the Editors


Pablo Mateo is the final pass editor for this book. He is Delivery
Manager at at one of the biggest Banks in the world, and was also
founder and CTO of a Technology Development company in
Madrid. His expertise is focused on web and mobile app
development, although he first started as a Creative Art Director.
He has been for many years the Main Professor of the iOS and
Android Mobile Development Masters Degree at a well-known
technology school in Madrid (CICE). He has a masters degree in
Artificial Intelligence & Machine-Learning and is currently
learning Quantum Computing at MIT.

Gustavo Graña is a Tech Editor for this book. He started coding


coding 20 years ago to solve daily problems he faced in the early
2000 to communicate, first with mIRC scripting language, but it
quickly evolved into a broader interest in other areas of
technology. He works with mobile since 2010 and with Swift since
2014. He is motivated by making an impact on the day-to-day with
technology, trying to make life easier for others. Outside the area
of technology, Gustavo is always eager to know how to have a
healthier life.

Jeremy Greenwood is a Tech Editor for this book. He brings over


20 years of experience in tech, building, testing, and innovating
digital products. His natural curiosity to understand the ins and
outs of his craft have given him expertise in all layers of the stack,
from hardware circuitry and embedded protocols to visual
experiences. Jeremy is passionate about taking product ideas from
the drawing board to digital screens and finds joy in the
opportunity to impact users through software. He is keen on the
details which elevate a project from ordinary to extraordinary.
When not working on software, Jeremy can most likely be found in
the woods on a trail, dreaming about creative solutions to everyday
problems.

raywenderlich.com 18
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