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 2: Going Beyond the Single Component with Lists and Scroll Views

In this chapter, we'll learn how to display lists in SwiftUI. List views are similar to UITableViews in UIKit but are significantly simpler to use. No storyboards or prototype cells are required, and we do not need to know how many rows there are. SwiftUI's lists are designed to be modular so that you can build bigger things from smaller components.

We'll also look at lazy stacks and lazy grids, which are used to optimize the display of large amounts of data by loading only the subset of the content that is currently being displayed or is about to be displayed. Lastly, we'll take a look at how to present hierarchical data in an expanding list with sections that can be expanded or collapsed.

By the end of this chapter, you will understand how to display lists of static or dynamic items, add or remove rows from lists, edit lists, add sections to list views, and much more.

In this chapter, we will cover the following recipes:

  • Using scroll views
  • Creating a list of static items
  • Using custom rows in a list
  • Adding rows to a list
  • Deleting rows from a list
  • Editing a list
  • Moving rows in a list
  • Adding sections to a list
  • Using LazyHStack and LazyVStack (iOS 14+)
  • Using LazyHGrid and LazyVGrid (iOS 14+)
  • Using ScrollViewReader (iOS 14+)
  • Using expanding lists (iOS 14+)
  • Using DisclosureGroup to hide and show content (iOS 14+)