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SwiftUI Cookbook

SwiftUI Cookbook

By : Giordano Scalzo, Nzokwe
4.3 (20)
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SwiftUI Cookbook

SwiftUI Cookbook

4.3 (20)
By: Giordano Scalzo, 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)
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Debugging an app based on Combine

It's a common idea that debugging reactive code is more difficult than debugging imperative code. Unfortunately, this is not completely wrong: partly because of the nature of the code and partly because the development tools are not sophisticated enough to follow this new paradigm.

Combine, however, implements a few convenient ways to help us understand what happens in our streams.

In this recipe, we'll learn about three techniques we can use to debug a Combine stream. I admit that all three are a bit basic; however, they are a starting point and should be enough to help us understand how to deal with errors in the streams.

Getting ready

Create a SwiftUI app called DebuggingCombine in Xcode.

How to do it…

Given the limited possibilities of debugging Combine, we will not be implementing a sophisticated app. Instead, we will be implementing a trivial three-button app that calls the three possible ways of debugging Combine...

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