在 TextField 问题中输入 DatePicker [英] Inputting DatePicker in TextField problems

问题描述

我试图让用户选择一个日期并将其显示在文本字段中.我在网上找到了很多答案，但似乎没有一个有效.如果它们已经过时，我不会.我在选择器部分的datePickerView.addTarget"上遇到错误.当我运行应用程序时，我点击文本字段，然后出现我想要的键盘.但是一旦我更改日期，应用程序就会崩溃.

I'm trying to let the user pick a date and let it display in a text field. I've found so many answers online but none of them seem to work. I don't if they are outdated. I'm getting an error on "datePickerView.addTarget" in the selector part. When I run the app, I tap on the text field and the keyboard appears which is what I want. But the app crashes as soon as I change the date.

任何帮助将不胜感激！

@IBAction func dateFieldEditing(sender: UITextField) {

    let datePickerView:UIDatePicker = UIDatePicker()

    datePickerView.datePickerMode = UIDatePickerMode.Date

    sender.inputView = datePickerView

    datePickerView.addTarget(self, action:Selector("handleDatePicker"),forControlEvents: UIControlEvents.ValueChanged)

}


func handleDatePicker (sender: UIDatePicker){

    let formatter = NSDateFormatter()
    formatter.dateStyle = .LongStyle
    dateField.text = formatter.stringFromDate(sender.date)
}

推荐答案

以下工作，假设您有一个 UITextField 和 UIDatePicker 通过 Interface Builder 绑定为 IBOutlets.不需要设置 sender.inputView.

The following works, assuming that you have a UITextField and UIDatePicker bound as IBOutlets via Interface Builder. Setting sender.inputView was unnecessary.

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var datePicker: UIDatePicker?
    @IBOutlet weak var textField: UITextField?

    func handleDatePicker (sender: UIDatePicker) {
        let formatter = NSDateFormatter()
        formatter.dateStyle = .LongStyle
        textField!.text = formatter.stringFromDate(sender.date)
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        self.datePicker!.datePickerMode = UIDatePickerMode.Date
        datePicker!.addTarget(self, action:#selector(handleDatePicker(_:)), forControlEvents: UIControlEvents.ValueChanged)
    }
}

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