直接看代码案例快速入手SwiftUI

本文介绍Button，Image，Toggle。

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Button

struct ButtonContentView: View {
    
    @GestureState private var isPressed = false
    
    @State private var isButtonEnabled = false

    var body: some View {
        VStack {
            Button("Click me", action: {
                print("Button clicked")
            })
            Button(action: {
                print("Button clicked")
            }) {
                Text("Custom button")
                    .padding()
                    .background(Color.blue)
                    .foregroundColor(.white)
                    .cornerRadius(10)
            }
            Button(action: {
                print("Image button clicked")
            }) {
                Image(systemName: "star.fill")
            }
            Button(action: {
                print("Image text button clicked")
            }) {
                HStack {
                    Image(systemName: "star.fill")
                    Text("Image text button")
                }
            }
            Button(action: {
                print("Button clicked")
            }) {
                Text("Long press button")
                    .scaleEffect(isPressed ? 0.5 : 1)
                    .animation(.easeInOut(duration: 0.9), value: isPressed)
            }
            .simultaneousGesture(LongPressGesture(minimumDuration: 0.5)
                .updating($isPressed) { value, state, _ in
                    state = value
                    print(value)
                    print("LongPress button clicked")
                }
            )

            Button(action: {
                print("Click on the enable/disable button")
            }) {
                Text("Enable/Disable button")
            }
            .disabled(!isButtonEnabled)
        }
    }
}

struct ButtonContentView_Previews: PreviewProvider {
    static var previews: some View {
        ButtonContentView()
    }
}

Image

struct ImageContentView: View {
    var body: some View {
        VStack {
            Image("moon")
            Image(systemName: "star.fill")
            Image("moon")
                .renderingMode(.original)
            Image("moon")
                .resizable()
                .frame(width: 100, height: 100)
//            Image("moon")
//                .resizable()
//                .scaledToFit()
//            Image("moon")
//                .resizable()
//                .scaledToFill()
            
            Image("desk")
                .frame(width: 100, height: 100)
                .clipped()
//            Image("moon")
//                .resizable()
//                .clipShape(Circle())
            Image("moon")
                .shadow(color: .gray, radius: 5, x: 0, y: 5)
            Image("moon")
                .opacity(0.5)
        }
    }
}

struct ImageContentView_Previews: PreviewProvider {
    static var previews: some View {
        ImageContentView()
    }
}

Toggle

struct ToggleContentView: View {
    @State private var isOn = false

    var body: some View {
        VStack {
            Toggle("Switch", isOn: $isOn)

            Toggle(isOn: $isOn) {
                Text("Custom switch")
            }
            .toggleStyle(SwitchToggleStyle(tint: .red))

            HStack {
                Text("Horizontal arranged switch").lineLimit(1)
                Spacer()
                Toggle("", isOn: $isOn)
            }

            Toggle("Switch", isOn: $isOn)
                .onChange(of: isOn) { value in
                    print("Change in on/off status: \(value)")
                }
        }
    }
}

struct ToggleContentView_Previews: PreviewProvider {
    static var previews: some View {
        ToggleContentView()
    }
}