![]() ![]() Then report back here with your feedback ID and I can make sure it gets to the right folks as soon as possible. In the sheet that appears, click "Generate Report" in the bottom left of the sheetĪttach (or make from the folder) the resulting zip file to the bug (will be named something like previews-diagnostics-0123456789.zip) When you get an error in Xcode Previews, an error banner appears in the canvasĬlick the "Diagnostics" button in that banner We will need the diagnostics Xcode Previews generates in order to make sure we understand the error the previews system is encountering. If that still doesn't resolve issue then probably best next step will be to file a feedback with diagnostics. To start from a fresh slate you can use the terminal app and run xcrun simctl -set previews delete all. ![]() Sorry to hear you are having problems getting previews working.īased upon your description of the situation I am guessing that maybe there is something ending up in the app's data container that is causing the problem. If I run the app in the emulator it does load but also takes a very long time to start. It is obviously better to extract it from the official source yourself, but I think the archives are signed. There are also publicly hosted GitHub repositories with these folders, a quick search will turn them up. Using xcrun simctl shutdown all followed by scrub simctl erase all ( although this does seem to cause it to fail more quickly )Ĭlearing the contents of my ~/Library/Xcode/UserData/Previews folder.Īt some point trying all of these something did work because I was briefly able to use it, but the next time I restarted the problem was back. You can add support for iOS 14.5 (and watchOS 7.4) by copying the relevant DeviceSupport folders from Xcode 12.5 to Xcode 12.4. The app "myApp.app" did not launch on "iPhone 11" in 15 seconds. For information about Xcode Cloud releases, see Xcode Cloud release notes. For more information, visit Apple Developer Program. If you're going to use an older Xcode version, turn off automatic updates on your device. Membership includes access to beta OS releases, advanced app capabilities, and tools to develop, test, and distribute apps and Safari extensions. Search these forums for those posts, and you might find a workaround. The app only contains an Image and a couple of ToolbarItems, there's no logic there yet and the spinner keeps on spinning long after the build is complete.Ĭlicking on Diagnostics gives little more information:Ĭode Block AppLaunchTimeoutError: Failed to launch app "myApp.app" in reasonable time I have seen multiple questions on these forums about people unable to install apps built with Xcode 13.4.1 on devices running iOS 15.6. I am trying to get started with SwiftUI but whenever I try to start the preview window I see a spinner for a minute or more ( it's currently been spinning for around 10 minutes ) followed by the message Failed to launch app "myApp.app" in reasonable time. ![]()
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