IOS 14中的UIDatePicker在键盘中显示背景tabBar

// 创建UITextField作为输入框
let textField = UITextField(frame: CGRect(x: 0, y: 0, width: 200, height: 40))

// 创建UIDatePicker作为输入视图
let datePicker = UIDatePicker()
datePicker.datePickerMode = .dateAndTime

// 创建UIToolbar作为输入框上方的工具栏
let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 44))

// 创建一个关闭按钮
let closeButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(closePicker))

// 将关闭按钮添加到工具栏
toolbar.setItems([closeButton], animated: false)

// 将UIDatePicker设置为UITextField的输入视图
textField.inputView = datePicker

// 将UIToolbar设置为UITextField的输入框上方的工具栏
textField.inputAccessoryView = toolbar

// 关闭按钮的点击事件
@objc func closePicker() {
    textField.resignFirstResponder() // 关闭键盘
}

// 将UITextField添加到视图中
view.addSubview(textField)