SwiftUI：如何使TextField成为第一响应者？

目前似乎还不太可能，但是您可以自己实现类似的功能。

您可以创建一个自定义文本字段并添加一个值，使其成为第一响应者。

struct CustomTextField: UIViewRepresentable {    class Coordinator: NSObject, UITextFieldDelegate {        @Binding var text: String        var didBecomeFirstResponder = false        init(text: Binding<String>) { _text = text        }        func textFieldDidChangeSelection(_ textField: UITextField) { text = textField.text ?? ""        }    }    @Binding var text: String    var isFirstResponder: Bool = false    func makeUIView(context: UIViewRepresentableContext<CustomTextField>) -> UITextField {        let textField = UITextField(frame: .zero)        textField.delegate = context.coordinator        return textField    }    func makeCoordinator() -> CustomTextField.Coordinator {        return Coordinator(text: $text)    }    func updateUIView(_ uiView: UITextField, context: UIViewRepresentableContext<CustomTextField>) {        uiView.text = text        if isFirstResponder && !context.coordinator.didBecomeFirstResponder  { uiView.becomeFirstResponder() context.coordinator.didBecomeFirstResponder = true        }    }}

注意：

didBecomeFirstResponder

SwiftUI

您将像这样使用它…

struct ContentView : View {    @State var text: String = ""    var body: some View {        CustomTextField(text: $text, isFirstResponder: true) .frame(width: 300, height: 50) .background(Color.red)    }}

PS我添加了一个，

frame

TextField

更多关于

Coordinators

在Xpre 11.4上测试