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)

Showing a sheet modally

The Modality design technique can be used to present content in a temporary mode that's separate from the user's previous content and requires an explicit action to exit. Modals can help focus on a self-contained task or set of closely related tasks.

In this recipe, we will learn how to present a sheet modally and how to add navigation items to the modal.

Getting ready

Create a SwiftUI app named ModalViewApp.

How to do it

We shall create two SwiftUI views named ModalView and ModalWithNavView that would be displayed modally when a button is clicked. The steps are as follows:

  1. In ContentView.swift, between the struct declaration and the body variable, add two state variables, showModal and sheetWithNav. The state variables will be used to trigger the sheet presentation:
    @State private var showModal = false
    @State private var sheetWithNav = false;
  2. Add a VStack and a button that changes the value of our showModal variable to true...