ViewModifier/视图修饰符, ButtonStyle/按钮样式的使用

1. ViewModifier 视图修饰符

1.1 创建默认按钮视图修饰符 ViewModifierBootcamp.swift

import SwiftUI/// 默认按钮修饰符
struct DefaultButtonViewModifier: ViewModifier{let bcakgroundColor: Colorfunc body(content: Content) -> some View {content.foregroundColor(.white).frame(height: 55).frame(maxWidth: .infinity).background(bcakgroundColor).cornerRadius(10).shadow(radius: 10)}
}// 扩展 View
extension View {func withDefaultButtonFormatting(backgroundColor: Color = .blue) -> some View{modifier(DefaultButtonViewModifier(bcakgroundColor: backgroundColor))}
}/// 视图修饰符
struct ViewModifierBootcamp: View {var body: some View {VStack(spacing: 10) {Text("Hello,world!").font(.headline).withDefaultButtonFormatting(backgroundColor: .orange)Text("Hello,everyone!").font(.subheadline).withDefaultButtonFormatting()Text("Hello !!!").font(.title).withDefaultButtonFormatting(backgroundColor: .red)}.padding()}
}struct ViewModifierBootcamp_Previews: PreviewProvider {static var previews: some View {ViewModifierBootcamp()}
}

1.2 效果图:

2. ButtonStyle 自定义按钮样式

2.1 创建按下按钮样式，ButtonStyleBootcamp.swift

import SwiftUI///  按下按钮样式
struct PressableButtonStyle: ButtonStyle{let scaledAmount: CGFloatinit(scaledAmount: CGFloat) {self.scaledAmount = scaledAmount}func makeBody(configuration: Configuration) -> some View {configuration.label// 缩放.scaleEffect(configuration.isPressed ? scaledAmount : 1.0)// 点亮度//.brightness(configuration.isPressed ? 0.05 : 0).opacity(configuration.isPressed ? 0.86 : 1)}
}/// 扩展 View
extension View{/// 按钮的样式func withPressableStyle(scaledAmount: CGFloat = 0.9) -> some View{buttonStyle(PressableButtonStyle(scaledAmount: scaledAmount))}
}/// 按钮样式
struct ButtonStyleBootcamp: View {var body: some View {Button {} label: {Text("Click Me").font(.headline).withDefaultButtonFormatting()}.withPressableStyle(scaledAmount: 0.86).padding(40)}
}struct ButtonStyleBootcamp_Previews: PreviewProvider {static var previews: some View {ButtonStyleBootcamp()}
}