Book Image

SwiftUI Essentials – iOS 14 Edition

By : Neil Smyth
Book Image

SwiftUI Essentials – iOS 14 Edition

By: Neil Smyth

Overview of this book

Do you want to create iOS apps with SwiftUI, Xcode 12, and Swift 5.3, and want to publish it on the app store? This book helps you achieve these skills with a step-by-step approach. This course first walks you through the steps necessary to set up an iOS development environment together and introduces Swift Playgrounds to learn and experiment with Swift—specifically, the Swift 5.3 programming language. After establishing key concepts of SwiftUI and project architecture, this course provides a guided tour of Xcode in SwiftUI development mode. The book also covers the creation of custom SwiftUI views and explains how these views are combined to create user interface layouts, including the use of stacks, frames, and forms. One of the more important skills you’ll learn is how to integrate SwiftUI views into existing UIKit-based projects and explain the integration of UIKit code into SwiftUI. Finally, the book explains how to package up a completed app and upload it to the app store for publication. Along the way, the topics covered in the book are put into practice through detailed tutorials, the source code for which is also available for download. By the end of this course, you will be able to build your own apps for iOS 14 using SwiftUI and publish it on the app store. The code files for the book can be found here: https://www.ebookfrenzy.com/retail/swiftui-ios14/
Table of Contents (56 chapters)
56
Index

36.2 Implicit Animation

Many of the built-in view types included with SwiftUI contain properties that control the appearance of the view such as scale, opacity, color and rotation angle. Properties of this type are animatable, in that the change from one property state to another can be animated instead of occurring instantly. One way to animate these changes to a view is to use the animation() modifier (a concept referred to as implicit animation because the animation is implied for any modifiers applied to the view that precede the animation modifier).

To experience basic animation using this technique, modify the ContentView.swift file in the AnimationDemo project so that it contains a Button view configured to rotate in 60 degree increments each time it is tapped:

struct ContentView : View {

    

    @State private var rotation: Double = 0

 

    var body: some View {

    ...