Objective c 解除popover后如何确定从UIDatePicker中选择的日期？

我目前有一个popover

DatePickerViewController

，它是我在storyboard中创建的，它有一个UIDatePicker。我希望能够关闭popover并将日期发送到我的原始视图

ViewController

，但我不确定如何执行此操作。我知道如何从UIDatePicker获取日期，我只是不知道当popover被解除时如何获取数据

我正在

ViewController

中尝试此操作，但从未显示NSLog输出

- (void) popoverControllerDidDismissPopover:(UIPopoverController *)popoverController {
    NSDate *selectedDate = ((DatePickerViewController *) popoverController.contentViewController).datePicker.date;
    NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *dateComponents = [calendar components:(NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit) fromDate:selectedDate];
    int selectedYear = [dateComponents year];
    int selectedMonth = [dateComponents month];
    int selectedDay = [dateComponents day];

    self.dateLabel.text = [NSString stringWithFormat:@"%d/%d/%d",selectedMonth,selectedDay,selectedYear];

    NSLog(@"hello world"); // never shows up
}

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我必须在prepareforsgue中设置delegate=self：

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:@"toDatePicker"]) {
    UIStoryboardPopoverSegue *popoverSegue;
    popoverSegue = (UIStoryboardPopoverSegue *)segue;

    UIPopoverController *popoverController;
    popoverController = popoverSegue.popoverController;
    popoverController.delegate=self;
}
}

---

我已将

ViewController

设置为

UIPopoverControllerDelegate