SwiftUI - Button

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• 本文来自
  http://www.coolketang.com/hdjc/swiftUI/

• 官方文档 SwiftUI Button
  https://developer.apple.com/documentation/swiftui/button

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---

struct ContentView: View
{
    var body: some View
    {
        VStack
        {
            Button("First button")
            {
                print("---First button action.")
            }
            
            Button(action:
            {
                print("---Second button action.")
            }) {
                Text("Second button")
            }
            
            Button(action:
            {
                print("---Third button action.")
            }) {
                Image(systemName: "clock")
                Text("Third button")
            }
            .foregroundColor(Color.white)
            .background(Color.blue)
            
            Button(action:
            {
                print("---padding for button.")
            }){
                Text("Default padding")
            }
            .padding(30)
            .background(Color.yellow)
            
            Button(action:
            {
                print("---padding for label.")
            }){
                Text("Default padding")
                    .padding(30)
                    .background(Color.pink)
            }
            
            Button(action:
            {
                print("---Button with image.")
            }){
                VStack
                {
                    Image(systemName: "star")
                    Text("Button with image")
                }
                .padding()
                .background(Color.yellow)
            }
        }
    }
}

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Show Sheet

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struct ContentView : View
{
    @State var isPresented = false
    
    var body: some View
    {
        VStack
        {
            Button("Show modal")
            {
                self.isPresented = true
            }.sheet(isPresented: $isPresented, content:
            {
                MyDetailView(message: "Model window")
            })
        }
    }
}

struct MyDetailView: View
{
    let message: String

    var body: some View
    {
        VStack
        {
            Text(message)
                .font(.largeTitle)
        }
    }
}