Book Image

SwiftUI Cookbook - Second Edition

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook - Second Edition

By: Giordano Scalzo, Edgar Nzokwe

Overview of this book

SwiftUI provides an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based cookbook, you’ll cover the foundations of SwiftUI as well as the new SwiftUI 3 features introduced in iOS 15 and explore a range of essential techniques and concepts that will help you through the development process. The cookbook begins by explaining how to use basic SwiftUI components. Once you’ve learned the core concepts of UI development, such as Views, Controls, Lists, and ScrollViews, using practical implementations in Swift, you'll advance to adding useful features to SwiftUI using drawings, built-in shapes, animations, and transitions. 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 by 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 encountered when building SwiftUI apps.
Table of Contents (17 chapters)

Implementing a stretchable header in SwiftUI

A stretchable header is a well-known effect where, on top of a scroll view, there is an image that scales up when the user slides down the entries.

An example can be found on the artist page of the Spotify app. But in general, it is so common that you are expecting it when a page has a big image as a banner on top of a list of items.

In this recipe, we'll implement a skeleton of the artist page on the Spotify app, and we'll see that this effect is easy to implement in SwiftUI too.

Getting ready

Let's create a SwiftUI app called StretchableHeader and add the two images – avatar.jpg and header.jpg – which you can find in the GitHub repo at https://github.com/PacktPublishing/SwiftUI-Cookbook-2nd-Edition-/tree/main/Resources/Chapter08/recipe10:

Figure 8.17 – Importing the images

How to do it…

We are going to implement two components, one for each row and the other...