下面的例子如何（单击在两种颜色之间切换）：

struct ContentView: View {
  @State private var clicked = false
  let color1 = Color.yellow
  let color2 = Color.purple
  
  var body: some View {
    Button() {
      clicked.toggle()
    } label: {
      Rectangle().fill(clicked ? color1 : color2)
    }
    .frame(width: 60, height: 30)
  }
}

你有一套颜色，你必须使用或你想使用一个随机的颜色对每一次点击？
这里有两个选项，只是取消注解你想使用的任何一个：
一个使用设置颜色的数组，另一个使用Color扩展每次获得一个随机颜色：

struct ContentView: View {
    @State private var color: Color = .black
    private var colors: [Color] = [.black, .red, .green, .yellow, .cyan]
    
    var body: some View {
        Button() {
            // pick one of the below options and comment out the other.
            
            // this gets a random color each time
            color = Color.random()
            // this gets a random color from the pre set colors array above.
            // you could also keep track of index and loop over the colors in order and start over if needed.
//            if let randomColor = colors.randomElement() {
//                color = randomColor
//            }
        } label: {
            Rectangle().fill(color)
        }
        .frame(width: 60, height: 30)
    }
}

public extension Color {
    static func random() -> Color {
        Color(
            red: .random(in: 0...1),
            green: .random(in: 0...1),
            blue: .random(in: 0...1),
            opacity: 1
        )
    }
}

你可以使用ButtonStyleisPressed来实现。

Button(){

      } label: {
        Text("Tap")
          .foregroundColor(.white)
      }
      .buttonStyle(ExampleButtonStyle())

struct ExampleButtonStyle: ButtonStyle {

  func makeBody(configuration: Configuration) -> some View {
    configuration.label
      .background {
        Rectangle().fill(configuration.isPressed ? .yellow : .black)
      }
  }
}