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)

Chapter 3: Viewing while Building with SwiftUI Preview

Developing an application requires several interactions between clients and developers. The clients may sometimes request minor changes, such as colors, fonts, and the position of items in the design. Previously, developers would need to update their design in Xcode and recompile all the code. iOS 13 solves this problem by introducing canvas previews. Previews allow the instant review and update of design changes without recompiling the whole code.

In this chapter, we will learn how to make effective use of Xcode previews to speed up the UI development time. The chapter includes the following recipes:

  • Previewing the layout in dark mode
  • Previewing the layout at different dynamic type sizes
  • Previewing the layout in a navigation view
  • Previewing the layout on different devices
  • Using previews in UIKit
  • Using mock data for previews