swift - 当我选择不同的 UITextField 时如何更改 UIPickerViewData？

Question

我想在点击 UITextField 时显示 UIPickerView。

我用 UIPickerView 创建了一个“地方”UITextField。

但是，我不知道如何使用 UIPickerView 制作另一个 UITextField。

我尝试使用“switch”，但 UITextField 不是一个值，所以我无法使用“switch”来做到这一点。

当我选择不同的 UITextField 时，我想更改 UIPickerViewData。

我该怎么办？

这是代码。

谢谢!

@IBOutlet weak var place: UITextField!
@IBOutlet weak var product: UITextField!
@IBOutlet weak var number: UITextField!

let placeArray = ["A", "B", "C", "D", "E", "F"]
let productArray = ["Apple", "Banana", "Grape"]
let numberArray = ["1", "2", "3", "4", "5", "6"]

var pickerView = UIPickerView()
var textField: UITextField!

func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    return placeArray.count
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    place.text = placeArray[row]
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return placeArray[row]
}



override func viewDidLoad() {
    super.viewDidLoad()

    pickerView.delegate = self
    pickerView.dataSource = self

    let tapGesture = UITapGestureRecognizer(target: self, action: #selector(displayPickerView))
    tapGesture.numberOfTapsRequired = 1
    place.addGestureRecognizer(tapGesture)

}


@objc private func displayPickerView() {
    if textField == nil {
        self.textField = UITextField(frame: .zero)
        textField.inputView = self.pickerView
        self.view.addSubview(textField)
    }
    textField.becomeFirstResponder()
}

Answer 1

非常简单的方法来做到这一点。

var placePickerView = UIPickerView()
var productPickerView = UIPickerView()
var numberPickerView = UIPickerView()

override func viewDidLoad() {
super.viewDidLoad()

placePickerView.delegate = self
placePickerView.dataSource = self
place.inputView = placePickerView

productPickerView.delegate = self
productPickerView.dataSource = self
product.inputView = productPickerView

numberPickerView.delegate = self
numberPickerView.dataSource = self
number.inputView = numberPickerView

}

func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    var numberOfRows: Int = 1
    if pickerView == placePickerView {
    numberOfRows = placeArray.count
    } else if pickerView == productPickerView {
        numberOfRows = productArray.count
    } else if pickerView == numberPickerView {
        numberOfRows = numberArray.count
    }
    return numberOfRows
}

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if pickerView == placePickerView {
        place.text = placeArray[row]
    } else if pickerView == productPickerView {
        productType.text = productArray[row]
    } else if pickerView == numberPickerView {
        transactionType.text = numberArray[row]
    } 
}

func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    var title: String?
    if pickerView == placePickerView {
        title = placeArray[row]
    } else if pickerView == productPickerView {
        title = productArray[row]
    } else if pickerView == numberPickerView {
        title = numberArray[row]
    }
    return title
}