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SwiftUI Cookbook

SwiftUI Cookbook

By : Giordano Scalzo, Nzokwe
4.8 (10)
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SwiftUI Cookbook

SwiftUI Cookbook

4.8 (10)
By: Giordano Scalzo, 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)
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Disabling/enabling items in a form

Forms may contain required and optional fields. Some fields may have additional requirements that need to be met. For example, the password fields may be required to contain at least eight characters. When developing an app, we may want to enable or disable the submit button based on the form requirements, thus allowing the users to submit a form only when it meets all our requirements.

In this recipe, we will create a sign-in page where the submit button gets enabled only if the user enters some content in the username and password fields.

Getting ready

Create a SwiftUI project and name it FormFieldDisabable.

How to do it…

We will create a SwiftUI view with a username field, password field, and a submit button. The submit button will be disabled unless the user enters some text in the username and password fields. The steps are as follows:

  1. Create a new SwiftUI view file named LoginView:

    a. Press + N.

    b. Select...

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