MacOS 上的 SwiftUI：检测焦点变化并以编程方式强制焦点变化

Question

我想检测 Focus Change 并强制执行 Focus Change.
在这个简单的示例中，我想检测用户是否点击了其中一个文本字段。
另一方面，我想用一个按钮以编程方式设置焦点。

struct ContentView: View {

  @State private var textA = ""
  @State private var textB = ""

  @State private var focusableA = false
  @State private var focusableB = false

    var body: some View {
      VStack{
        HStack{
          TextField("Field A", text: $textA)
          .focusable(focusableA, onFocusChange: {f in print ("FocusChange A \(f)")})
          TextField("Field V", text: $textB)
          .focusable(focusableB, onFocusChange: {f in print ("FocusChange B \(f)")})
        }
        HStack{
          Button(action: {self.focusableA = true; self.focusableB = false }) 
          {Text("Set Focus to A")}
          Button(action: {self.focusableB = true; self.focusableA = false }) 
          {Text("Set Focus to B")
          }
        }
    }
    .frame(maxWidth: .infinity, maxHeight: .infinity)
  }
}

上面的代码不起作用，怎么办。

Answer 1

I want to detect, if a user clicks in one of the textfields.

这是一个例子

TextField("Title", text: boundText, onEditingChanged: { editing in
            if editing {
                print(">> start editing, got focus")
            } else {
                print(">> end editing, lost focus")
            }
        })

I want so set the focus programaticly with a Button

SwiftUI 本身暂时不为此提供 API。 .focusable 赋予能力可以聚焦视图，默认情况下不是这样（例如文本），但不是强制设置焦点。

MacOS 上的 SwiftUI：检测焦点变化并以编程方式强制焦点变化

SwiftUI on MacOS: Detect Focus Change and force Focus Change programaticly

keyboard

macos

focus

swiftui