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SwiftUI Cookbook

SwiftUI Cookbook

By : Giordano Scalzo, Nzokwe
4.3 (20)
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SwiftUI Cookbook

SwiftUI Cookbook

4.3 (20)
By: Giordano Scalzo, Nzokwe

Overview of this book

SwiftUI provides an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based cookbook, you’ll cover the foundations of SwiftUI as well as the new SwiftUI 3 features introduced in iOS 15 and explore a range of essential techniques and concepts that will help you through the development process. The cookbook begins by explaining how to use basic SwiftUI components. Once you’ve learned the core concepts of UI development, such as Views, Controls, Lists, and ScrollViews, using practical implementations in Swift, you'll advance to adding useful features to SwiftUI using drawings, built-in shapes, animations, and transitions. You’ll understand how to integrate SwiftUI with exciting new components in the Apple development ecosystem, such as Combine for managing events and Core Data for managing app data. Finally, you’ll write iOS, macOS, and watchOS apps by sharing the same SwiftUI codebase. By the end of this SwiftUI book, you'll have discovered a range of simple, direct solutions to common problems encountered when building SwiftUI apps.
Table of Contents (17 chapters)
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Transforming shapes

In the Creating basic animations recipe, you can see that SwiftUI is able to animate the change of common characteristics, such as position, color, size, and so on. But what if the feature we want to animate is not part of the framework?

In this recipe, we'll create a triangular shape whose height is equal to the width times a fraction of the width. When we tap on the triangle, we set that multiplier to a random number, making the height change.

How can we instruct SwiftUI to animate the change of the multiplier? We'll see that the code needed is simple but that the underlying engine is quite sophisticated.

Getting ready

This recipe doesn't need any external resources, so let's just create a SwiftUI project called AnimateTriangleShape in Xcode.

How to do it…

We are going to implement a triangle shape where the height is equal to a fraction of the width. Then, when tapping on the shape, the multiplier will randomly change...

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