Book Image

SwiftUI Cookbook - Second Edition

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook - Second Edition

By: Giordano Scalzo, Edgar 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)

Applying a delay to a view modifier animation to create a sequence of animations

We have reached version 3 of SwiftUI, but still there is no way of joining different animations together to create a sequence of animations. This will surely be fixed in a later SwiftUI version, but at the moment, we can implement a sequence of animations using a delay.

As you should know, there are two ways of defining an animation:

  • Using the .animation() view modifier
  • Using the withAnimation function

In this recipe, we'll see how to use the .animation() view modifier, and we'll cover the withAnimation function in the next recipe, Applying a delay to a withAnimation function to create a sequence of animations.

Getting ready

Let's create a SwiftUI project in Xcode called DelayedAnimations.

How to do it…

In our app, we will create a sequence of three animations on a rectangle:

  • A change of the vertical offset
  • A change of scale
  • A 3D rotation...