Question

是否可以使用SwiftUI在动作关闭中获得按钮本身？

struct ContentView: View {
    var body: some View {
        Button("test") {
            // change the color of button when user is tapping on it
        }
    }
}

Answer 1

方法如下：

struct ContentView: View {
    @State var color = Color.red
    var body: some View {
        Button("test") {
            self.color = Color.green
        }.background(color)
    }
}

Answer 2

如果要访问按钮的属性，则可以创建自定义ButtonStyle。

使用其configuration设置所需的行为。

struct CustomButtonStyle: ButtonStyle {
    func makeBody(configuration: Self.Configuration) -> some View {
        configuration.label
            .frame(minWidth: 0, maxWidth: .infinity)
            .padding()
            .foregroundColor(.white)
            .background(LinearGradient(gradient: Gradient(colors: [.red, .orange]), startPoint: .leading, endPoint: .trailing))
            .cornerRadius(40)
            .scaleEffect(configuration.isPressed ? 0.9 : 1)
    }
}

以上示例摘自此处：SwiftUI Tip: ButtonStyle and Animated Buttons

根据您的情况，可以对其进行调整以设置自定义背景：

.background(configuration.isPressed ? Color.red : Color.blue)

Answer 3

是的...我也自己弄清楚

struct ContentView: View {
    @State var buttonColor: Color = Color.clear
    var body: some View {
        Button(action: {
            self.buttonColor = Color(red: Double.random(in: 0...1),
                                     green: Double.random(in: 0...1),
                                     blue: Double.random(in: 0...1))
        }, label: {
            Text("Button").background(buttonColor)
        })
    }
}

如何使用SwiftUI在动作关闭中获取按钮本身？

3 个答案: