About iOS 14 Widget

I would like to create a widget with a half-circular progress bar.

Like this:


struct HalvedCircularBar: View {
  @State var progress: CGFloat = 0.5
  var body: some View {
    VStack {
      ZStack {
        Circle()
          .trim(from: 0.0, to: 0.5)
          .stroke(Color.blue, style: StrokeStyle(lineWidth: 12.0, dash: [8]))
          .frame(width: 200, height: 200)
          .rotationEffect(Angle(degrees: -180))
        Circle()
          .trim(from: 0.0, to: progress/2)
          .stroke(Color.blue, lineWidth: 12.0)
          .frame(width: 200, height: 200)
          .rotationEffect(Angle(degrees: -180))
        Text("\(Int(self.progress*100))%")
          .font(.custom("HelveticaNeue", size: 20.0))
      }
    }
  }
}

It's ok in the playground and app, but it cannot appear in the widget. When I removed the  ".trim(from: 0.0, to: 0.5)" ,the circle appeared in the widget.

Why is the trim() method not available in ios14 widget ?