SwiftUI - 反转布尔绑定 [英] SwiftUI - Invert a boolean binding

问题描述

我在 swiftUI 视图中有一个绑定.类似的东西:

I have a binding in a swiftUI view. Something along the lines of :

struct MyCoolView: View { 
    @ObservedObject var viewModel: ViewModel

    var body: some View { 
        Text("Here is a cool Text!").sheet(isPresented: $viewModel.MyProperty) { 
                            SomeModalView()}
        }
} 

我希望 isPresented 使用存储在属性中的内容的 相反 布尔值.

I want the isPresented to use the opposite boolean value of what is stored in the property.

Swift 不会让我做类似的事情

Swift wont let me just do something like

.sheet(isPresented: !$viewModel.MyProperty) 

(它给了我一个关于无法将 Binding 转换为 Bool 的错误)

(It gives me an error about cannot convert Binding <Bool> to Bool)

有没有关于如何处理这个问题的想法?

Any thoughts on how to deal with this?

推荐答案

您可以自行构建绑定:

Text("Here is a cool Text!").sheet(isPresented:
         Binding<Bool>(get: {return !self.viewModel.MyProperty},
                       set: { p in self.viewModel.MyProperty = p})
          { SomeModalView()} } 

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