swiftui - SwiftUI 显示/关闭键盘

Question

下面的这段代码完美地显示和隐藏了 TextField 键盘，除了在运行代码时一直向我显示这个警告消息，有没有人可以帮助避免这个警告？

import UIKit
import SwiftUI

struct FirstResponderTextFiels: UIViewRepresentable {

    @Binding var text: String
    let placeholder: String
    @Binding var showKeyboard: Bool
    
    
    // Create the coordinator
    class Coordinator: NSObject, UITextFieldDelegate {
        
        @Binding var text: String
        @Binding var showKeyboard: Bool
        var becameFirstResponder = false
        
        init(text: Binding<String>, showKeyboard: Binding<Bool>) {
            self._text = text
            self._showKeyboard = showKeyboard
        }
        func textFieldDidChangeSelection(_ textField: UITextField) {
            text = textField.text ?? ""
        }
        
    }
    
    func makeCoordinator() -> Coordinator {
        return Coordinator(text: $text, showKeyboard: $showKeyboard)
    }
    
    
    // Create the textfield
    func makeUIView(context: Context) -> some UIView {
        let textField = UITextField()
        textField.delegate = context.coordinator
        textField.placeholder = placeholder
        return textField
    }
    
    func updateUIView(_ uiView: UIViewType, context: Context) {
        
        if context.coordinator.showKeyboard {
            uiView.becomeFirstResponder()
            context.coordinator.showKeyboard = false
        }
    }
    
}

警告信息

标签： swiftuikeyboard

Answer 1

在查看代码后，我发现如果我删除这部分代码它没有任何效果，它工作正常

    func updateUIView(_ uiView: UIViewType, context: Context) {
    
    if context.coordinator.showKeyboard {
        uiView.becomeFirstResponder()
       context.coordinator.showKeyboard = false   // <--- Remove it
    }
}