https://github.com/timac/fb9687147-swiftui-animation-deinit-thread

This sample Xcode project demonstrates a SwiftUI issue (FB9687147)
https://github.com/timac/fb9687147-swiftui-animation-deinit-thread

Last synced: 6 days ago
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This sample Xcode project demonstrates a SwiftUI issue (FB9687147)

• Host: GitHub
• URL: https://github.com/timac/fb9687147-swiftui-animation-deinit-thread
• Owner: Timac
• Created: 2021-10-08T09:03:56.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2021-10-08T09:18:33.000Z (over 3 years ago)
• Last Synced: 2024-11-16T13:04:37.495Z (2 months ago)
• Language: Swift
• Size: 4.18 MB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Dei: DeinitInThread/DeinitInThread.xcodeproj/project.pbxproj

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README

        
## Description

This simple Xcode project demonstrates an issue with SwiftUI where a View animation triggers deinit in a thread. This issue has been reported as FB9687147 to Apple.

![](video.mov)

## Steps to Reproduce

- Download the sample Xcode project DeinitInThread

- Open this project in Xcode 13.0

- Compile and run this project on iOS 15.0 on a device or simulator

- Tap on the button `Switch to Sample View`

- Tap on the button `Switch to Content View`

Result: In the Xcode console you will see a warning that the deinit is called in a thread

```

"**** DEINIT running in some thread {number = 8, name = (null)}"

```

## Reproducibility

- This issue can be reproduced with Xcode 13.0 when running on iOS 15.0 on a device or simulator.

- This issue was not yet tested on iOS 15.1 beta.

## Details

- The Xcode project contains 2 SwiftUI views.

- A button lets you switch from one view to the second view with an animation.

- If the view has a viewModel, the `deinit` for the viewModel is called in a thread rather than in the main thread:

```

struct ContentView: View {

	@EnvironmentObject var appState: AppState

	var body: some View {

		VStack(spacing: 0) {

			switch appState.contentType {

				case .homeScreen:

					Button {

						appState.contentType = .contact

					} label: {

						Text("Switch to Sample View")

					}

				default:

					SampleView()

			}

		}.animation(.default, value: appState.contentType)

	}

}

```