Скачать или смотреть How to Fix UIViewControllerRepresentable Crashes in Xcode 14 and iOS 16

Discover the solution to resolve `UIViewControllerRepresentable` crashes while creating Xcode previews in SwiftUI and UIKit. Learn the best practices to avoid these errors in your iOS development.
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This video is based on the question https://stackoverflow.com/q/72775055/ asked by the user 'Mary Doe' ( https://stackoverflow.com/u/14934238/ ) and on the answer https://stackoverflow.com/a/72775233/ provided by the user 'Asperi' ( https://stackoverflow.com/u/12299030/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix UIViewControllerRepresentable Crashes in Xcode 14 and iOS 16

Creating seamless previews for your view controllers can significantly enhance your development experience in Xcode. However, many developers have encountered frustrations with UIViewControllerRepresentable crashing when attempting to use it with iOS 16 in Xcode 14. In this post, we’ll explore the issue you're facing and provide a clear solution to ensure that your previews run smoothly.

The Problem: Crashes when Using UIViewControllerRepresentable

When trying to create Xcode previews for your view controller, you may run into errors that lead to crashes. This issue can manifest particularly when:

You are not using Storyboards and rely solely on programmatic creation of your view controller.

You misconstrue Swift's struct and class paradigms, especially with regard to how UIViewControllerRepresentable is implemented.

For instance, your initial attempt may look something like this:

[[See Video to Reveal this Text or Code Snippet]]

Here, the use of a class for the UIViewControllerRepresentable is causing the crashes.

The Solution: Embrace Structs in UIViewControllerRepresentable

To fix the crash issue, you need to switch from using a class for your representable to using a struct. SwiftUI requires that UIViewControllerRepresentable be implemented with structs due to the way it manages state and lifecycle events. Here’s a step-by-step guide to revise your code:

Step 1: Change Your Representable Type

Instead of defining your UIViewControllerRepresentable as a class, create it as a struct:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Update the Preview Provider

Now, modify your preview provider to reference the new struct instead:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Here is the complete corrected version of your code that should work flawlessly:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By switching from a class to a struct for your UIViewControllerRepresentable, you not only avoid crashes when generating previews in Xcode 14 and iOS 16, but you also adhere to best practices in SwiftUI development. This minor adjustment can save you a lot of time and frustration in the long run. Happy coding!