ios - UIPickerView - 不适用于 UITextView TouchUp

Question

我有一个包含三个 UITextView 的表单。我想在点击文本字段时显示一个 UIPickerView。我已经为它写了下面的代码-

@IBAction func selectServiceBook(_ sender: UITextField) {

    let message = "\n\n\n\n\n\n"
    let alert = UIAlertController(title: "Select Service Book", message: message, preferredStyle: UIAlertControllerStyle.alert)
    alert.isModalInPopover = true

    let pickerFrame = UIPickerView(frame: CGRect(x: 20, y: 20, width: 200, height: 140)) // CGRectMake(left, top, width, height) - left and top are like margins
    pickerFrame.tag = 666
    //set the pickers datasource and delegate
    pickerFrame.delegate = self

    //Add the picker to the alert controller
    alert.view.addSubview(pickerFrame)
    let okAction = UIAlertAction(title: "OK", style: .default, handler: {
        (alert: UIAlertAction!) -> Void in
        self.ServiceBook.text = self.selectedServiceBook
    })
    alert.addAction(okAction)
    self.present(alert, animated: true, completion: {
        self.ServiceBook.text = self.selectedServiceBook
    })
}

这会完成两个字段的工作，但在点击 ServiceBook 时，键盘会打开，而不是选择器 View 。当我点击屏幕上的其他任何地方时，会弹出选择器 View 。所以我的假设不是 EditingDidBegin，而是指 EditingDidEnd 事件。

我如何检查并确认？

Answer 1

这里是例子

let myPickerProject = [ "Project 1", "Project 2", "Project 3", "Project 4", "Project 5", "Project 6"] // to feed row
pickerProject.delegate = self
let pickerProject = UIPickerView()
let txtFiled = UITextField.init(frame: <#T##CGRect#>)
txtFiled.inputView = pickerProject
func numberOfComponents(in pickerView: UIPickerView) -> Int {
     return 1
} 
func pickerView( _ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
     return myPickerProject.count
}

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

func pickerView( _ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    let selectedvalue = myPickerProject[row]
}