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 and hiding sections in forms

Forms provide a means of getting information from the user. Long forms can, however, discourage users from providing information. Users not completing a form may mean fewer people signing up for your app or providing payment information.

In this recipe, we will learn how to show/hide an additional address section of a form based on user input.

Getting ready

Create a SwiftUI Project named SignUp.

How to do it…

We will create a signup form with sections for various user input. The additional address sections will be shown or hidden based on how long the user has lived at their current address. Use the following steps:

  1. Create a new SwiftUI View called signUpView:

    a. Press + N.

    b. Select SwiftUI View.

    c. Click Next.

    d. Click on the Save As field and enter the text signUpView.

    e. Click Finish.

  2. Declare and initialize the @State variables that will be used in the form:
    @State private var fname = ""
    @State...