Question

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，但它只会在第一次更新今天的日期。用户更改日期，但文本字段不会继续更新。有什么问题？

这就是我调用Datepicker并控制输入到文本字段的日期的方法：

 @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)
}

Answer 1

您的handleDatePicker方法每次调用时都会实例化一个新的DatePicker。{}您需要向函数添加一个参数以传递发件人（在DatePicker中创建的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)
}

Answer 2

Swift 4.2版本

@IBAction func onEditDob(_ 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"
        dob.text = dateFormatter.string(from: sender.date)
}

Answer 3

    let selectedDate = datePicker.date
    print(selectedDate)
    let formatter = DateFormatter()
    formatter.dateFormat = "dd/MM/yyyy"
    let strDate = formatter.string(from: selectedDate)
    self.labelDate.text = strDate

Answer 4

datePicker = UIDatePicker(frame:CGRect(x: 0, y: self.view.frame.size.height-180 , width: self.view.frame.size.width, height: 200))
    self.view.addSubview(datePicker)
    datePicker.datePickerMode = UIDatePickerMode.dateAndTime
    datePicker.isHidden = true
    button.isSelected = false
    datePicker.addTarget(self, action: #selector(self.dateSelected), for: UIControlEvents.valueChanged)

 @objc func dateSelected()
{
    let dateformatter1 = DateFormatter()
    dateformatter1.dateFormat = "ccc, d MMM yyy"

    let dateString1 = dateformatter1.string(from: datePicker.date)
    print("Date Selected \(dateString1)")
    labelDate.text = dateString1

    let dateformatter2 = DateFormatter()
    dateformatter2.dateFormat = "dd-MM-yyyy"
    let dateString2 = dateformatter2.string(from: datePicker.date)
    print("Date Selected \(dateString2)")


    let dateformatter3 = DateFormatter()
    dateformatter3.dateFormat = "dd/MM/yyyy"
    let dateString3 = dateformatter3.string(from: datePicker.date)
    print("Date Selected \(dateString3)")

    let dateformatter4 = DateFormatter()
    dateformatter4.dateFormat = "dd MMMM yyyy hh:mm a"
    let dateString4 = dateformatter4.string(from: datePicker.date)
    print("Date Selected \(dateString4)")

}

DatePicker and NSDateFormat上的这篇文章对我帮助很大。

Swift：使用UIDatePicker作为UITextField inputView不更新

4 个答案: