如何通过日期选择器（或只是日期）在Swift中的文本字段上显示日期？ [英] How to pass the date picker (or just the date) to show the date on textfield in Swift?

问题描述

我想在键盘上显示日期选择器视图。我正在使用UITextField扩展名进行此操作。

I want show a date picker view on keyboard. I am doing this using UITextField extension.

我的代码：

extension UITextField {

//... other functions

func showDatePicker(){
    let datePicker = UIDatePicker()
    datePicker.datePickerMode = .date

    let toolbar = UIToolbar();
    toolbar.sizeToFit()

    let doneButton = UIBarButtonItem(title: "Pronto", style: UIBarButtonItemStyle.plain, target: self, action: #selector(UITextField.doneDatePicker(_:)))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancelar", style: UIBarButtonItemStyle.plain, target: self, action: #selector(UITextField.donePicker))
    toolbar.setItems([cancelButton,spaceButton,doneButton], animated: false)

    self.inputAccessoryView = toolbar

    self.inputView = datePicker

}

@objc func doneDatePicker(_ datePicker: UIDatePicker){

    let formatter = DateFormatter()
    formatter.dateFormat = "dd/MM/yyyy"
    self.text = formatter.string(from: datePicker.date)
    self.endEditing(true)
}
}

我的问题是当我点击 Pronto按钮时n并执行函数doneDatePicker。我需要传递UIDatePicker（或只是日期）以在文本字段上显示日期，但出现此错误：

My problem is when I tap "Pronto" button and the function doneDatePicker is executed. I need pass the UIDatePicker (or just the date) to show the date on textfield but I get this error:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIBarButtonItem date]: unrecognized selector sent to instance 0x103488850'

我该如何解决？

推荐答案

您应该简单地将UITextField子类化，并将datepicker声明为UITextField的属性，并覆盖didMoveToSuperview方法并在那里进行自定义：

You should simply subclass UITextField and declare your datepicker as a property of your UITextField, override didMoveToSuperview method and do the customisation there:

class DateField: UITextField {
    var date: Date?
    let datePicker = UIDatePicker()
    let formatter = DateFormatter()
    override func didMoveToSuperview() {
        datePicker.datePickerMode = .date
        formatter.dateStyle = .short
        let toolbar = UIToolbar()
        toolbar.sizeToFit()
        let done = UIBarButtonItem(title: "Pronto", style: .plain, target: self, action: #selector(doneAction))
        let space = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
        let cancel = UIBarButtonItem(title: "Cancelar", style: .plain, target: self, action: #selector(cancelAction))
        toolbar.setItems([cancel,space,done], animated: false)
        inputAccessoryView = toolbar
        inputView = datePicker
    }
    @objc func cancelAction(_ sender: UIBarButtonItem) {
        endEditing(true)
    }
    @objc func doneAction(_ sender: UIBarButtonItem) {
        date = datePicker.date
        text = formatter.string(from: datePicker.date)
        endEditing(true)
    }
}

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