AnimatedView.swift

struct AnimatedView: View {
  @State var percentComplete: CGFloat = 0.0

  var body: some View {
    Ellipse()
      .trim(from: 0, to: self.percentComplete)
      .stroke(Color.purple, style: StrokeStyle(lineWidth: 20, lineCap: .round))
      .frame(width: UIScreen.main.bounds.width / 2, height: UIScreen.main.bounds.width)
      .animation(.easeOut(duration: 2.0))
      .onAppear {
        self.percentComplete = 0.7
    }
  }
}