Unknown progress indicator view

UnknownProgressIndicator.swift

struct UnknownProgressIndicator: View {
    var size: CGFloat = 100
    var primaryColor = Color(red: 1.0, green: 0.5, blue: 0.4)
    var bgColor = Color(red: 0.155, green: 0.041, blue: 0.3)
    var animationCycleTime: CGFloat = 3.5
    
    @State private var rotation: CGFloat = 90
    
    var body: some View {
       Circle()
            .fill(bgColor)
            .frame(width: size, height: size)
            .overlay {
                Circle()
                    .fill(primaryColor)
                    .frame(width: size * 0.62, height: size * 0.62)
                    .overlay {
                        Image(systemName: "questionmark")
                            .resizable()
                            .aspectRatio(contentMode: .fill)
                            .frame(width: size * 0.18, height: size * 0.18)
                            .fontWeight(.bold)
                    }
            }
            .overlay {
                Circle()
                    .trim(from: 0.0, to: 0.5)
                    .stroke(
                        AngularGradient(
                            gradient: Gradient(colors: [bgColor, primaryColor]),
                            center: .center,
                            startAngle: .degrees(0),
                            endAngle: .degrees(180)
                        ),
                        style: StrokeStyle(lineWidth: size * 0.09, lineCap: .round)
                    )
                    .rotationEffect(.degrees(rotation))
                    .padding(.all, (size * 0.09)/2)
            }
            .clipShape(Circle())
            .onAppear {
                withAnimation(.linear(duration: animationCycleTime).repeatForever(autoreverses: false)) {
                    rotation += 360
                }
            }
            
    }
}

#Preview {
    UnknownProgressIndicator()
}