我创建了两个按钮。一个称为Weight，另一个称为Age。这两个按钮都将相同的UITextField设置为第一响应者。但是，如果触摸了Weight按钮，键盘类型就变成了数字小键盘;如果触摸Age按钮，则键盘类型变为UIPickerView。代码如下：

@IBOutlet var weightButton: UIButton!
@IBOutlet var ageButton: UIButton!
@IBOutlet var userInput: UITextField!

let agePicker = UIPickerView()
let ageAsString =  ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18"]
var selectedAge: Double?

override func viewDidLoad() {
    super.viewDidLoad()
    createAgePicker()
}

//ButtonsClicked
@IBAction func weightSearch(_ sender: Any) {
    wieghtResponse()
}

@IBAction func ageSearch(_ sender: Any) {
    ageResponse()
}

func userInputResponse() {
    userInput.inputView = nil
    if weightButton.isTouchInside {
        userInput.inputView = nil
        userInput.keyboardType = UIKeyboardType.numberPad
        userInput.becomeFirstResponder()
    } else if ageButton.isTouchInside {
        userInput.inputView = nil
        userInput.inputView = agePicker
        userInput.becomeFirstResponder()
    }

//CreateAgePicker
func createAgePicker() {
    agePicker.delegate = self
    agePicker.backgroundColor = .white
    agePicker.tintColor = .clear
}
//Components
@available(iOS 2.0, *)
func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}
//Rows
@available(iOS 2.0, *)
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return ageAsString.count
}
//Labels
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return ageAsString[row]
}

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我遇到的问题是，当我单击Age按钮时，拾取器视图加载。但是，当我单击Weight按钮时，输入视图不会恢复为数字键盘，而是保持为选择器。有什么建议吗