[英]How to pass the date picker (or just the date) to show the date on textfield in Swift?
I want show a date picker view on keyboard. 我想在键盘上显示日期选择器视图。 I am doing this using UITextField extension. 我正在使用UITextField扩展名执行此操作。
My code: 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)
}
}
My problem is when I tap "Pronto" button and the function doneDatePicker is executed. 我的问题是,当我点击“ Pronto”按钮并执行了函数doneDatePicker。 I need pass the UIDatePicker (or just the date) to show the date on textfield but I get this error: 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:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIBarButtonItem date]: unrecognized selector sent to instance 0x103488850'
How can I solve this? 我该如何解决?
It is not possible to pass extra parameters through selectors. 无法通过选择器传递额外的参数。 Why you are passing date picker to 为什么要将日期选择器传递给
@objc func doneDatePicker(_ datePicker: UIDatePicker)
Replace 更换
let datePicker = UIDatePicker()
with 与
var datePicker: UIDatePicker!
and put it as shared instance in a singleton class. 并将其作为共享实例放在单例类中。 then access datePicker inside the function. 然后在函数内部访问datePicker。
You should simply subclass UITextField and declare your datepicker as a property of your UITextField, override didMoveToSuperview method and do the customisation there: 您应该仅继承UITextField的子类,并将datepicker声明为UITextField的属性,覆盖didMoveToSuperview方法并在那里进行自定义:
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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