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)

Beyond buttons – how to use advanced pickers

In this recipe, we will learn how to implement the pickers, namely, Picker, Toggle, Slider, Stepper, and DatePickers. Pickers are typically used to prompt the user to select from a set of mutually exclusive values; Toggles are used to switch between on/off states; and Sliders are used to select a value from a bounded linear range of values. Like Sliders, Steppers also provide the user interface for selecting from a range of values. However, Steppers use a + and sign to allow the users to increment the desired value by a certain amount. Finally, DatePickers are used to select dates.

Getting ready

Create a new SwiftUI project named PickersApp.

How to do it…

  1. In ContentView.swift, create @State variables to hold the values selected from Pickers and other controls. Place the variables between the ContentView struct and the body:
        @State var choice = 0