SwiftUI navigationBarItems: 'cycle detected through attribute' error on device rotation

Question

I'm getting very strange error messages with Xcode 11.5. Having device rotation support enabled, I get a bunch of error messages telling me "=== AttributeGraph: cycle detected through attribute XY ===" when the app launched in portrait mode and the screen of the simulator gets rotated. It only occurs on the simulator and just with iPhones, not iPads. Also, if I remove "navigationBarItems" the error message doesn't appear. Additionally, the content on the screen looks off (only on the Simulator, again). If I rotate again, the content is as expected.

struct ContentView: View {
    
    var body: some View {
        NavigationView {
            Text("SwiftUI")
                .navigationBarTitle("Welcome")
                .navigationBarItems(trailing:
                    Button("Help") {
                        print("Help tapped!")
                    }
            )
        }
    }
}

Asperi · Accepted Answer · 2020-06-30 03:53:12Z

0

Works fine with Xcode 12 / iOS 14. As a workaround you can try to use stack navigation style for both orientations

struct ContentView: View {

    var body: some View {
        NavigationView {
            Text("SwiftUI")
                .navigationBarTitle("Welcome")
                .navigationBarItems(trailing:
                    Button("Help") {
                        print("Help tapped!")
                    }
            )
        }.navigationViewStyle(StackNavigationViewStyle())    // << here !!
    }
}

answered Jun 30, 2020 at 3:53

Asperi

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1 Comment

leonboe1 Over a year ago

Thank you! However, even with StackNavigationStyle the issue is still present. Maybe Xcode is somehow corrupted for me?

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