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)

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

There are a couple of images that we will use in this recipe, both of them courtesy of crommelincklars on Flickr (https://www.flickr.com/photos/142899511@N03).

Let's create a SwiftUI app called StretchableHeaderApp 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/tree/master/Resources/Chapter07/recipe11:

...