swiftuixcode11

SwiftUI: Automatic Preview Updating Error "Failed to build ContentView.swift"

I'm trying to run the Automatic Preview in Xcode 11, however even though the project builds successfully, the automatic preview fails giving me the error Failed to build ContentView.swift. Failed to code sign ContentView.swift.

I have just created the project without any modifications to the auto generated code. Even the code signing has also been set properly. Note I'm using the Free Apple Developer Account. Could this cause any problem?

Following is the code from ContentView.swift file:

import SwiftUI

struct ContentView : View {
    var body: some View {
        Text("Hello World")
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
#endif
Solution

  • First select the Xcode using following command

    sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

    Then run

    sudo xcodebuild -license

    Hope it is helpful