使用Xcode 12，您可以使用.onChange修饰符监听切换按钮的更改，每当用户切换按钮时，您可以将其切换回上一个状态，如果用户不是高级用户，则显示purchase this表单。

.onChange(self.feature.isEnabled) { isEnabled in
                    if isEnabled && shouldShowPurchaseSheet {
                        // toggle back if you want the button to go to the inactive state
                        // show the sheet
                    }
                }

您可以将disabled修改器添加到Toggle。

struct ContentView: View {

    @State private var feature = PaidFeature()
    @EnvironmentObject var model: Model

    var body: some View {
        Toggle(isOn: self.$feature.isEnabled) {
            Text("Hello, World!")
        }.disabled(!model.hasUserPaid)
    }
}

我想应该是

var body: some View {
    Toggle(isOn: self.$feature.isEnabled) {
        Text("Hello, World!")
    }
    .disabled(!model.hasUserPaid)     // << here !!
}

**更新：**带显示表的替代变体演示。在Xcode 12 / iOS 14下测试

为简单起见，所有演示的所有状态都保留在视图中

struct DemoView: View {
    @State private var feature = false
    @State private var paid = false
    @State private var showPurchase = false

    var body: some View {
        Toggle(isOn: $feature) {
            Text("Hello, World!")
        }
        .allowsHitTesting(paid)
        .contentShape(Rectangle())
        .simultaneousGesture(TapGesture().onEnded {
            if !self.paid {
                self.showPurchase = true
            }
        })
        .sheet(isPresented: $showPurchase) {
            Text("Purchase this")
                .onDisappear {
                    self.paid = true
                }
        }
    }
}

You can use condition in body查看

if self.model.hasUserPaid == true {
   Toggle(isOn: self.$feature.isEnabled)) {
      Text("Hello, World!")
   }
} else {
   Toggle(isOn: .constant({default Bool})) {
      Text("Hello, World!")
   }
}