ios - 如何确保在文本字段中仅选择选择器数据

Question

我在 UITextfield 中使用以下代码作为选择器函数，我应该如何确保选择数组中的值并且没有其他数据输入我分享了下面的代码，我使用“guard”来检查字段是否为空代码

var spinneCPickerData: [String] = ["1", "2", "3", "4", "5"]
@IBOutlet var pickerfield: UITextField!
    
override func viewDidLoad() {
    super.viewDidLoad()
            
    let spinnerCPicker = UIPickerView()
    spinnerCPicker.delegate = self
    pickerfield = spinnerCPicker
}
    
func numberOfComponents(in pickerView: UIPickerView) -> Int {
    return 1
}
        
func pickerView( _ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {      
    return spinneCPickerData.count
}
        
func pickerView( _ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
    return spinneCPickerData[row]
}
        
func pickerView( _ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    pickerfield.text = spinneCPickerData[row] as String
    view.endEditing(true)
}

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    // This method is triggered whenever the user makes a change to the picker selection.
    // The parameter named row and component represents what was selected.
}
    
func setdata() {
    guard let text data = PostCategoryField.text, !postcategory.isEmpty,  else {
        self.view.makeToast("Please Enter the Category!")
        return
    }
}

Answer 1

您需要将 inputView 设置为您的 pickerfield。

像这样你可以做...

声明一个属性pickerView

 private let pickerView = UIPickerView(frame: .init(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 216))

在viewDidLoad方法中设置委托(delegate)和数据源。

    pickerView.dataSource = self
    pickerView.delegate = self
    pickerfield.inputView = pickerView

因此，当 pickerfield 成为第一响应者时，选择器 View 将代替键盘显示。

因此用户必须从选择器 View 中选择一个值

更新

您可以通过以下方式通过 if-let 来完成此操作。您需要将此代码放在要验证文本字段值的位置。

//When pickerfield.text value is one of the value of spinneCPickerData array
if let txt = pickerfield.text, spinneCPickerData.contains(txt) {

       print("the textfield'd value is from the array")
 }