Question 131423 in Xcode Question posted in
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Xcode 13 will not show Preview

I have a brand new 21 Macbook Pro with the M1 Pro chip. I installed Xcode from the app store, and I have also installed Xcode beta. I am completely up to date on Monterey as well.

I am building a swift UI app and I cannot get preview to work at all.

I get the following error.

== PREVIEW UPDATE ERROR:

    MessageSendFailure: Message send failure for send previewInstances message to agent
    
    ==================================
    
    |  RemoteHumanReadableError
    |  
    |  LoadingError: failed to load library at path "/Users/user/Library/Developer/Xcode/DerivedData/Test-gfnknimtrrhvztavjffxvzjvrvmo/Build/Intermediates.noindex/Previews/Test/Intermediates.noindex/Test.build/Debug-iphonesimulator/Test.build/Objects-normal/arm64/SwiftUIView.2.preview-thunk.dylib": Optional(dlopen(/Users/user/Library/Developer/Xcode/DerivedData/Test-gfnknimtrrhvztavjffxvzjvrvmo/Build/Intermediates.noindex/Previews/Test/Intermediates.noindex/Test.build/Debug-iphonesimulator/Test.build/Objects-normal/arm64/SwiftUIView.2.preview-thunk.dylib, 0x0002): tried: '/Users/brandon/Library/Developer/Xcode/DerivedData/Test-gfnknimtrrhvztavjffxvzjvrvmo/Build/Intermediates.noindex/Previews/Test/Products/Debug-iphonesimulator/SwiftUIView.2.preview-thunk.dylib' (no such file), '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/Users/user/Library/Developer/Xcode/DerivedData/Test-gfnknimtrrhvztavjffxvzjvrvmo/Build/Intermediates.noindex/Previews/Test/Intermediates.noindex/Test.build/Debug-iphonesimulator/Test.build/Objects-normal/arm64/SwiftUIView.2.preview-thunk.dylib' (no such file), '/Users/user/Library/Developer/Xcode/DerivedData/Test-gfnknimtrrhvztavjffxvzjvrvmo/Build/Intermediates.noindex/Previews/Test/Intermediates.noindex/Test.build/Debug-iphonesimulator/Test.build/Objects-normal/arm64/SwiftUIView.2.preview-thunk.dylib' (no such file), '/usr/lib/SwiftUIView.2.preview-thunk.dylib' (no such file))

I have tried to reinstall xcode, reboot you name it.

I can get simulator to work…

Any ideas?

Tags:

4

Answers


  1. 0

    I had the same problem and found a solution here:
    https://developer.apple.com/forums/thread/691237

    I was not signed in to GitHub so as suspected, it does not play a role.

    It seems Xcode got in to an invalid state. I suspect that simply disabling and enabling automatic signing would resolve the issue but I also cleared the Container folder for my project as suggested in the post.

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  2. 0

    Same issue and resolved it by change Mac’s user name to lowercase.
    Username->username

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  3. 0

    Nothing I tried worked, including running:

    • sudo xcodebuild -license in the terminal
    • Deleting derived data
    • Sign in again to GitHub
    • Restarts

    Only when I toggled Automatically refresh canvas (Editor > Canvas) I got preview back.
    Preview was failing on a new default projects as well.

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  4. 0

    I had the same problem because I downloaded a GitHub project (an existing SwiftUI project) and I didn’t create a new SwiftUI project from scratch. I notice the SwiftUI view doesn’t had the PreviewProvider struct at the bottom:

    struct SwiftUIView_Previews: PreviewProvider {
    static var previews: some View {
        SwiftUIView()
    }
}

    After adding the PreviewProvider struct, Xcode showed the Preview.

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