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)

Adding actions to alert buttons

We may want to display alerts with more than just an OK button to confirm the alert has been read. In some cases, we may want to present a Yes or No choice to the user. For example, if the user wanted to delete an item in a list, we may want to present an alert where clicking on yes deletes the item and clicking on no does not change anything.

In this recipe, we will look at how to add a secondary button to alerts.

Getting ready

Create a SwiftUI app named AlertsWithActions.

How to do it

We will implement an alert with two buttons and an action. The alert will get triggered by a tap gesture on some text. The steps are as follows:

  1. Create a @State variable that determines if the alert is displayed or not. Place the variable just below the ContentView struct declaration:
    @State private var changeText = false
  2. Create a @State variable to hold the text to be displayed on the screen. Give it an initial value of Tap to Change Text: