How to use DatePicker in iOS

UIDatePicker *_datePickerView = [[UIDatePicker alloc] initWithFrame:CGRectZero];

            _datePickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;

            _datePickerView.datePickerMode = UIDatePickerModeDate;

           

            CGRect pickerRect = CGRectMake(    0.0, 480, 320, 250);

            _datePickerView.frame = pickerRect;

            _datePickerView.hidden = YES;

            _datePickerView.datePickerMode = UIDatePickerModeDate;

            // in case we previously chose the Counter style picker, make sure

            // the current date is restored

            NSDate *today = [NSDate date];

            _datePickerView.date = today;

            _datePickerView.datePickerMode = UIDatePickerModeDate;

            [_datePickerView addTarget:self action:@selector(updateLabel:) forControlEvents:UIControlEventValueChanged];

           

            [parent.view addSubview:_datePickerView];

-(void)updateLabel:(id)sender

{

    NSDateFormatter *df = [[NSDateFormatter alloc] init];

    df.dateStyle = NSDateFormatterMediumStyle;

   

    NSCalendar *calendar = [NSCalendar currentCalendar];

    int year   =    [[calendar components:NSYearCalendarUnit    fromDate:[_datePickerView date]] year];

    int month  =    [[calendar components:NSMonthCalendarUnit   fromDate:[_datePickerView date]] month];

    int day    =    [[calendar components:NSDayCalendarUnit     fromDate:[_datePickerView date]] day];

   

    NSString *date = [NSString stringWithFormat:@"%d/%d/%d",year, month, day];//[df stringFromDate:_datePickerView.date]];

   

    [_birthdayLabel setTitle:date forState:UIControlStateNormal];

   

    /* the following allows you to choose the date components

     NSCalendar *calendar = [NSCalendar currentCalendar];

    

     int hour   =    [[calendar components:NSHourCalendarUnit    fromDate:[datePicker date]] hour];

     int minute =    [[calendar components:NSMinuteCalendarUnit  fromDate:[datePicker date]] minute];

    

     int year   =    [[calendar components:NSYearCalendarUnit    fromDate:[datePicker date]] year];

     int month  =    [[calendar components:NSMonthCalendarUnit   fromDate:[datePicker date]] month];

     int day    =    [[calendar components:NSDayCalendarUnit     fromDate:[datePicker date]] day];

     */

}