SwiftUI Animation

animetion.swift

import SwiftUI

var sw = UIScreen.main.bounds.width

struct ContentView: View {
    
    @State var drive:Bool = true
    
    var body: some View {
        ZStack{
            Circle()
                .stroke(style: StrokeStyle(lineWidth: 20))
                .frame(width: sw*0.8, height: sw*0.8)
                .foregroundColor(.gray)
            
            Circle()
                .stroke(style: StrokeStyle(lineWidth: 4,dash:[20,20]))
                .frame(width: sw*0.8, height: sw*0.8)
                .foregroundColor(.white)
               
            Image("car")
                .resizable()
                .frame(width: 30, height: 30)
                .offset(x:-sw*0.4,y:0)
                .rotationEffect(.degrees(drive ? 360:0))
                .animation(Animation.linear(duration: 4).repeatForever(autoreverses: false))
                .onAppear{
                    self.drive.toggle()
                }

        }
        
      
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}