通过实时预览 (SwiftUI) 执行操作/使用手势

Question

我有 CustomToggle，我想通过 Live Preview 测试它。问题是通过 Live Preview 轻敲切换没有任何作用，但在运行 Simulator.

时效果很好

struct CustomToggle: View {
    @Binding var isOn: Bool

    // ... displaying CustomToggle view
    // ... and toggling isON onTapGesture

}

struct CustomToggle_Previews: PreviewProvider {
    @State static var isOn = true
    static var previews: some View {
        CustomToggle(isOn: $isOn)
    }
}

Answer 1

您可以为此定义一个结构：

struct StatefulPreviewWrapper<Value, Content: View>: View {
    @State var value: Value
    var content: (Binding<Value>) -> Content

    var body: some View {
        content($value)
    }

    init(_ value: Value, content: @escaping (Binding<Value>) -> Content) {
        self._value = State(wrappedValue: value)
        self.content = content
    }
}

然后像这样在预览中使用它：


struct CustomToggle_Previews: PreviewProvider {
    static var previews: some View {
        StatefulPreviewWrapper(false) { CustomToggle(isOn: [=11=]) }
    }
}

通过实时预览 (SwiftUI) 执行操作/使用手势

Performing actions / working with gestures via Live Preview (SwiftUI)

action

preview

gesture

swiftui