Book Image

SwiftUI Cookbook

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook

By: Giordano Scalzo, Edgar Nzokwe

Overview of this book

SwiftUI is an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, right from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based book, you’ll work with SwiftUI and explore a range of essential techniques and concepts that will help you through the development process. The recipes cover the foundations of SwiftUI as well as the new SwiftUI 2.0 features introduced in iOS 14. Other recipes will help you to make some of the new SwiftUI 2.0 components backward-compatible with iOS 13, such as the Map View or the Sign in with Apple View. The cookbook begins by explaining how to use basic SwiftUI components. Then, you’ll learn the core concepts of UI development such as Views, Controls, Lists, and ScrollViews using practical implementation in Swift. By learning drawings, built-in shapes, and adding animations and transitions, you’ll discover how to add useful features to the SwiftUI. When you’re ready, 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 while 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 found in building SwiftUI apps.
Table of Contents (15 chapters)

Applying a delay to a withAnimation function to create a sequence of animations

As we mentioned in the previous recipe, SwiftUI doesn't have a way to define a chain of animations yet, but this can be simulated using delay animations.

As mentioned in the previous recipe, 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 withAnimation function. We covered the .animation view modifier in the previous recipe, Applying a delay to a view modifier animation to create a sequence of animations.

Getting ready

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

How to do it…

To illustrate the delay applied to the withAnimation function, we are going to implement an app that presents three text elements that appear and disappear in sequence when tapping on a button...