I have just recently started using Swiftui and have the following question: I would like to convert the current time to an analog view. But when I use the code below, I always get an error message at the angle. What is the reason that it does not work?

struct Hand: Shape {
  let inset: CGFloat
  let angle: Angle

  func path(in rect: CGRect) -> Path {
    let rect = rect.insetBy(dx: inset, dy: inset)
    var path = Path()
    path.move(to: CGPoint(x: rect.midX, y: rect.midY))
    path.addRoundedRect(in: CGRect(x: rect.midX - 4, y: rect.midY - 4, width: 8, height: 8), cornerSize: CGSize(width: 8, height: 8))
    path.move(to: CGPoint(x: rect.midX, y: rect.midY))
    path.addLine(to: position(for: CGFloat(angle.radians), in: rect))
    return path
}

  private func position(for angle: CGFloat, in rect: CGRect) -> CGPoint {
    let angle = angle - (.pi/2)
    let radius = min(rect.width, rect.height)/2
    let xPosition = rect.midX   (radius * cos(angle))
    let yPosition = rect.midY   (radius * sin(angle))
    return CGPoint(x: xPosition, y: yPosition)
}
}

struct TickHands: View {
    @State private var currentDate = Date()

    let timer = Timer.publish(every: 0.5, on: .main, in: .common).autoconnect()

    var body: some View {
     ZStack {
        Hand(inset: 50, angle: currentDate.hourAngle)
            .stroke(lineWidth: 4)
            .foregroundColor(.black)
        Hand(inset: 22, angle: currentDate.minuteAngle)
            .stroke(lineWidth: 4)
            .foregroundColor(.black)
        Hand(inset: 10, angle: currentDate.secondAngle)
            .stroke(lineWidth: 2)
            .foregroundColor(.gray)
    }
    .onReceive(timer) { (input) in
        self.currentDate = input
    }}}

CodePudding user response：

Based on the link you provided, It looks like the author of the article did not provide some extensions. Add the following extensions to your code (preferable in a new file), and you should be good