Question

我正在做一个手提,我正在使用日期挑选人,并在提交的文本中展示选定日期。现在,我想更新案文领域,因为选定日期在选址上有所变化。

hOw可以这样做。给我一些解决办法。

Thanks in advance.

Answer 1

You can be notified of UIDatePicker changes by simply adding a target & action for the control event UIControlEventValueChanged. Check the UIDatePicker reference for more details.

简单执行将考虑这样的问题:

 [picker addTarget:self 
            action:@selector(datePickerValueChanged:)
  forControlEvents:UIControlEventValueChanged];

and then...

   - (void)datePickerValueChanged:(id)sender{
        UIDatePicker *picker = (UIDatePicker *)sender;
        NSString *dateString;

        dateString = [NSDateFormatter localizedStringFromDate:[picker date]
                                                    dateStyle:NSDateFormatterMediumStyle 
                                                    timeStyle:NSDateFormatterNoStyle];

        [textField setText:dateString];


}

Answer 2

将这一行动与<条码>日光机值变化>连接起来。如变更日期,将在<条码>中显示。

-(IBAction)pkrValueChange:(UIDatePicker*)sender{

    textField.text = [[sender date] description];

}

Answer 3

<>Swift 4.2 Xcode 10.1

datePicker.addTarget(self, action: #selector(datePickerValueChanged), for: .valueChanged)

@objc
private func datePickerValueChanged() {
    let dateFormatter = DateFormatter()
    dateFormatter.dateStyle = .medium
    dateFormatter.timeStyle = .short
    let dateString = dateFormatter.string(from: datePicker.date)
    yourTextField.text = "(dateString)"
}

友情链接