SOLVED: Remove Xcode live preview data?

@pd95 HWS+

Aug '20

Hi everybody

While developing and testing my SwiftUI views, I have created files in the documents directory of the simulator which is running the live preview.

Is there any easy way to clear the apps container? I tried to "Clean build folder", which didn't help. As the simulator is not visible and cannot controlled in the same way as a regular iOS simulator, I cannot simply delete my app.

Sometimes the content disappears... but I do not understand exactly when. I tried to stop/start the live preview, restarting Xcode, ...

Has somebody found a solution?

kr Philipp

@destari

Oct '20

Two places to look:

Derived Data: Xcode -> Preferences -> Locations -> Derived Data ^^ that will tell you where the folder is. Then you can look into the folder named YourAppName-{some long string of characters}/Index/...

If you are storing data in CoreData, you can look here:

~/Library/Containers/{your.bundle.identifier}/Data/Library/Application Support/{YourAppName}

Hope that helps!

@nashysolutions

Dec '20

Try clearing the data model completely.

Setup a do catch for your core data persistent stack and pass the error into a fatalError message

} catch {
    fatalError("The database failed to load: \(error)")
}

This will then print the error in ~/Library/Logs/DiagnosticReports

The printed error should show you a URL where you can find the .sqlite file.

Delete the directory at the /preview level.

I also deleted the /preview folder that had a 'dateModified' of today, because my error was specifically 'failed migration'. So I figured the model from the referenced (older) folder was trying to migrate to the current.

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