IQKeyboardManager工具栏空白按钮的VoiceOver禁用方法求助

我在应用中使用IQKeyboardManager管理键盘，已配置以下属性且运行正常：

IQKeyboardManager.shared().toolbarPreviousBarButtonItemAccessibilityLabel = "previous"
IQKeyboardManager.shared().toolbarNextBarButtonItemAccessibilityLabel = "next"
IQKeyboardManager.shared().toolbarDoneBarButtonItemAccessibilityLabel = "ok"

目前遇到的问题是：键盘顶部工具栏的中间区域存在一个空白按钮（推测是自动纠错或文本建议相关字段），需要禁用它的VoiceOver识别功能。截图显示键盘工具栏左侧为「上一步」「下一步」按钮，右侧是「完成」按钮，中间有一块无视觉内容但可被VoiceOver识别的交互区域。

以下是几种可行的解决思路：

• 直接定位并禁用目标视图的VoiceOver属性
  通过监听键盘弹出事件，遍历IQKeyboardManager的工具栏子视图，找到中间的空白按钮并关闭其可访问性标识：

  NotificationCenter.default.addObserver(forName: UIKeyboardDidShowNotification, object: nil, queue: .main) { _ in
      guard let toolbar = IQKeyboardManager.shared().keyboardToolbar else { return }
      for subview in toolbar.subviews {
          // 根据位置特征匹配中间区域的按钮
          let midX = toolbar.frame.midX
          if subview.frame.origin.x > midX - 60 && subview.frame.origin.x < midX + 60,
             subview is UIButton {
              subview.isAccessibilityElement = false
              subview.accessibilityElementsHidden = true
          }
      }
  }
  

• 检查IQKeyboardManager的内置配置
  尝试调整IQKeyboardManager的相关开关，看是否能直接隐藏这个空白区域：

  • 尝试设置shouldShowToolbarPlaceholder = false（若当前版本支持该属性），关闭工具栏占位元素
  • 针对输入框设置autocorrectionType = .no，禁用自动纠错功能，看是否能消除该空白按钮

• 自定义工具栏替换默认实现
  关闭IQKeyboardManager的自动工具栏，手动为输入框添加自定义工具栏，完全控制按钮元素：

  IQKeyboardManager.shared().enableAutoToolbar = false
  
  // 示例：为UITextField添加自定义工具栏
  func setupCustomToolbar(for textField: UITextField) {
      let toolbar = UIToolbar()
      toolbar.sizeToFit()
      
      let prevBtn = UIBarButtonItem(title: "上一步", style: .plain, target: self, action: #selector(prevTextField))
      let nextBtn = UIBarButtonItem(title: "下一步", style: .plain, target: self, action: #selector(nextTextField))
      let doneBtn = UIBarButtonItem(title: "完成", style: .done, target: self, action: #selector(dismissKeyboard))
      let flexibleSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
      
      toolbar.items = [prevBtn, nextBtn, flexibleSpace, doneBtn]
      textField.inputAccessoryView = toolbar
  }
  
  @objc func prevTextField() {
      // 实现上一步逻辑
  }
  
  @objc func nextTextField() {
      // 实现下一步逻辑
  }
  
  @objc func dismissKeyboard() {
      UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
  }
  

内容的提问来源于stack exchange，提问作者Akif