Swift:使用 UIDatePicker 作为 UITextField inputView 不更新 [英] Swift: using UIDatePicker as UITextField inputView not updating

问题描述

我有一个文本字段，当它被选中时，会弹出一个日期选择器而不是键盘，但它第一次只更新今天的日期.用户更改了日期，但文本字段不会继续更新.有什么问题?

I have a textfield and when it is selected a datepicker pops up instead of a keyboard, but it only updates with todays date the first time. The user changes the date, but the textfield does not continue to update. What is the problem?

这就是我调用 Datepicker 并控制输入到我的文本字段中的日期的方式:

This is how I call the Datepicker and control the date being inputted into my textfield:

 @IBAction func dp(sender: UITextField) {
    var DatePickerView  : UIDatePicker = UIDatePicker()
    DatePickerView.datePickerMode = UIDatePickerMode.Date
    textfieldjobdate.inputView = DatePickerView
    DatePickerView.addTarget(self, action: Selector("handleDatePicker"), forControlEvents: UIControlEvents.ValueChanged)    
}

func handleDatePicker() {
    var DatePickerView  : UIDatePicker = UIDatePicker()
    var dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "dd MMM yyyy"
    textfieldjobdate.text = dateFormatter.stringFromDate(DatePickerView.date)
}

推荐答案

您的 handleDatePicker 方法在每次被调用时都会实例化一个新的 DatePicker.需要给函数添加一个参数，传入发送方(func dp中创建的DatePicker)

Your handleDatePicker method is instantiating a new DatePicker each time it's called. You need to add a parameter to the function to pass in the sender (the DatePicker created in func dp)

@IBAction func dp(_ sender: UITextField) {
    let datePickerView = UIDatePicker()
    datePickerView.datePickerMode = .date
    sender.inputView = datePickerView
    datePickerView.addTarget(self, action: #selector(handleDatePicker(sender:)), for: .valueChanged)
}

@objc func handleDatePicker(sender: UIDatePicker) {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd MMM yyyy"
    textfieldjobdate.text = dateFormatter.string(from: sender.date)
}

这篇关于Swift:使用 UIDatePicker 作为 UITextField inputView 不更新的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！