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)

Using gestures with TabView

In the preceding recipe, we learned how to switch between tabs using the navigation pane at the bottom of the screen. However, when building an app, the client may want something else to trigger the navigation. Navigation between TabView tabs can be performed programmatically. In this recipe, we will use a tap gesture to trigger the transition from one tab to another, but the concept can be generalized to any other programmatic trigger.

Getting ready

Create a SwiftUI app for iOS and name it TabViewWithGestures.

How to do it

We will implement a screen with two TabView structs where the user would be able to transition between tabs by using the tab bar at the bottom of the screen or by clicking on some text. The steps are as follows:

  1. Click on the ContentView.swift file to open it in the editor window.
  2. Add an @State variable that holds the value of the currently selected tab. The variable should be located just above the body variable...