iphone - Xcode 保存要在标签中显示的 UIDatepicker

Question

以下代码用于显示我的 UIDatepicker:

- (IBAction)showActionSheet:(id)sender {
    NSString *title = UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation) ? @"\n\n\n\n\n\n\n\n\n" : @"\n\n\n\n\n\n\n\n\n\n\n\n" ;
    UIActionSheet *actionSheet = [[UIActionSheet alloc] 
                                  initWithTitle:[NSString stringWithFormat:@"%@%@", title, NSLocalizedString(@"Please Select A Date", @"")]
                                  delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"I've Made My Choice", nil];
    [actionSheet showInView:self.view];
    UIDatePicker *datePicker = [[[UIDatePicker alloc] init] autorelease];
    datePicker.datePickerMode = UIDatePickerModeDate;
    [actionSheet addSubview:datePicker];
}

一切正常，但我想做的是将用户的选择显示到我命名为“label1 ”的标签中。有人可以帮忙吗？谢谢!

更新:

这是更新后的代码:

- (IBAction)showActionSheet:(id)sender {
NSString *title = UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation) ? @"\n\n\n\n\n\n\n\n\n" : @"\n\n\n\n\n\n\n\n\n\n\n\n" ;
UIActionSheet *actionSheet = [[UIActionSheet alloc] 
                              initWithTitle:[NSString stringWithFormat:@"%@%@", title, NSLocalizedString(@"Please Select A Date", @"")]
                              delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:@"I've Made My Choice", nil];
[actionSheet showInView:self.view];
UIDatePicker *datePicker = [[[UIDatePicker alloc] init] autorelease];
datePicker.datePickerMode = UIDatePickerModeDate;
[actionSheet addSubview:datePicker];
[datePicker addTarget:self
               action:@selector(updateLabel:)
     forControlEvents:UIControlEventValueChanged];  

}

- (void)updateLabel:(id)sender {
NSDateFormatter *df = [[NSDateFormatter alloc] init];
df.dateStyle = NSDateFormatterMediumStyle;
label1.text = [NSString stringWithFormat:@"%@",[df stringFromDate:datePicker.date]];
[df release];


/* 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];
 */

}
这对于 .m 来说，我的 .xib 也正确绑定(bind)了“标签”:) 每当我选择日期时就会得到一个(空)值:(

Answer 1

.h

#import <UIKit/UIKit.h>
@interface YourViewController : UIViewController {
    IBOutlet UILabel *label1;
}
@property (nonatomic, retain) UILabel *label1;
@end

.m

@implementation YourViewController
@synthesize label1;
/*
     All of your code goes here
 */
@end

界面生成器

<小时/>

还将以下内容添加到您的 showActionSheet:

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

这应该会从 datePicker 更新您的标签:

-(void)updateLabel:(id)sender
{
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    df.dateStyle = NSDateFormatterMediumStyle;
    label1.text = [NSString stringWithFormat:@"%@",[df stringFromDate:datePicker.date]];
    [df release];


    /* 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];
      */
}