When running Xcode 12.0 beta (12A6159) on both macOS 10.15.5 and the latest Big Sur beta, live preview of SwiftUI designs fail with the following:
AppLaunchTimeoutError: Failed to launch app "DemoApp.app" in reasonable time
The app "DemoApp.app" did not launch on "iPhone Xʀ" in 15 seconds.
Diagnostic output reads as follows:
bundle identifier: com. example.DemoApp
device UDID: BB7A7CF8-7F03-4CB3-A206-7406ACE23305
path: /Users/demo/Library/Developer/Xcode/DerivedData/DemoApp-fnkrhbehrcwouubnnjadkynbkgeh/Build/Intermediates.noindex/Previews/iOS/Products/Debug-iphonesimulator/DemoApp.app
I've tried this with multiple simulator configurations (for example iPhone 11 running iOS 14, iPhone SE running iOS 13 and so on).
I was wondering if anyone else has seen this or has suggestions for ways to solve the problem.
technc
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Last seen
User for