当存在多个UITextField时，从UIDatePicker返回值

Question

我有多个UITextField，其中一些会使用＆＃39; UIDatePicker＆＃39;。如何在不必在textField.text = formatter.stringFromDate(datePicker.date)函数中编写datePickerChanged代码的情况下从UIDatePicker返回值？

func textFieldDidBeginEditing(textField: UITextField) {
    switch textField.tag {

        //tag = 3 is the text field that needs the date
    case 3:
        let datePicker = UIDatePicker()
        textField.inputView = datePicker
        datePicker.addTarget(self, action: "datePickerChanged:", forControlEvents: .ValueChanged)
        //textField.text = value returned from datePickerChanged
    default: break
    }
}

func datePickerChanged(datePicker: UIDatePicker) {
    let formatter = NSDateFormatter()
    formatter.dateStyle = .MediumStyle
    let dateTextValue = formatter.stringFromDate(datePicker.date)
    // how can I return (dateTextValue)?
}

Answer 1

您可以创建一个名为currentTextField的变量，并在您的案例陈述中将textField分配给currentTextField。然后你的datePickerChanged（_ :)函数可以使用currentTextField来设置日期。