"<i>Map Binding<\/i>地图绑定<\/b><SomeType?><i>to Binding<\/i>绑定<\/b><Bool>"

Question

我的视图中有这行代码：

@State private var selectedConversation: DbConversation? = nil

Answer 1

您可以定义 Binding 属性并包装您的 State 属性：

private var isPresented: Binding<Bool> {
    Binding(
        get: { selectedConversation != nil },
        set: { value in
            if !value {
                selectedConversation = nil
            }
        }
    )
}

Answer 2

您可以在用于isPresented<\/code>的didSet<\/code>中更新第二个属性

@State private var selectedConversation: DbConversation? = nil {
    didSet {
        isSelected = selectedConversation != nil
    }
}
@State var isSelected = false