SwiftUI

Question

我有一个带有 @FocusState 变量的父视图，我想将其传递给包含 TextField 的子视图。我希望能够从子视图中更改 FocusState，但出现错误 Cannot assign to property: 'self' is immutable 和 Cannot assign value of type 'Bool' to type 'FocusState<Bool>.Binding'。

父视图：

struct ParentView: View {
    @State private var text: String
    @FocusState private var isEditing: Bool
    
    var body: some View {
        ChildView($text, $isEditing)
    }
}

struct ChildView: View {
    @Binding var text: String
    var isEditing: FocusState<Bool>.Binding
    
    init(_ text: Binding<String>, _ isEditing: FocusState<Bool>.Binding) {
        self._text = text
        self.isEditing = isEditing
    }
    
    var body: some View {
        TextField("Username", text: $text)
            .focused(isEditing)
        
        Button("Click me!") {
            isEditing = false  // Error here
        }
    }
}

非常感谢！

Answer 1

只需通过绑定到包装值进行赋值，例如

Button("Click me!") {
    isEditing.wrappedValue = false  // << here !!
}

SwiftUI - 子视图的可变@FocusState？

SwiftUI - Mutable @FocusState for child view?

ios

swift

iphone

ios15