Why doesn't this simple view modifier work in iOS Swift Playgrounds on iPad Pro

Question

Created Dec ’20

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This code doesn't seem to work correctly. It should spin a system image using a very simple view modifier. Am I doing anything wrong in the code ?

Code Block  swiftimport PlaygroundSupport
import SwiftUI
struct ContentView: View {
    var body: some View {
        Image(systemName: "timer")
            .spinning()
    }
}
struct Spinning: ViewModifier {
    @State var isVisible: Bool = false
    func body(content: Content) -> some View {
        content
            .rotationEffect( Angle(degrees:  isVisible ? 360 : 0 ))
            .animation(Animation.linear(duration: 1).repeatForever(autoreverses: false))
            .onAppear { isVisible = true }
    }
}
extension View {
    func spinning() -> some View {
        self.modifier(Spinning())
    }
}
PlaygroundPage.current.setLiveView( ContentView() )

This app used to be Amazing ... what happened on the last update ?

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Answer 1

Kabe OP

Dec ’20

On Mac OX the code works fine, but if you

run it on the iPad Playgrounds, and
increase duration (i.e. to 4) and set autoreverse to true in line 18,

then you realize that there is a secondary animation which overlays the rotation.

Looks like a bug to me, or at least an inconsistency.

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