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)

Beyond buttons – using advanced pickers

In this recipe, we will learn how to implement pickers—namely, Picker, Toggle, Slider, Stepper, and DatePicker. Pickers are typically used to prompt the user to select from a set of mutually exclusive values. Toggle views are used to switch between on/off states. Slider views are used for selecting a value from a bounded linear range of values. As with Slider views, Stepper views also provide a UI for selecting from a range of values. However, steppers use the + and signs to allow users to increment the desired value by a certain amount. Finally, DatePicker views are used for selecting dates.

Getting ready

Create a new SwiftUI project named PickersApp.

How to do it…

Let's create a SwiftUI project that implements various pickers. Each picker will have a @State variable to hold the current value of the picker. The steps are given here:

  1. In the ContentView.swift file, create @State variables...