datePickerViewController.h
#import <UIKit/UIKit.h>
@interface datePickerViewController : UIViewController {
 UIDatePicker *selectTime;
 IBOutlet UILabel *label;
 IBOutlet UITextField *textField;
}
@property(nonatomic, retain)IBOutlet UIDatePicker *selectTime;
-(IBAction)buttonPressed;
@end
datePickerViewController.m
#import "datePickerViewController.h"
@implementation datePickerViewController
@synthesize selectTime;
-(IBAction)buttonPressed{
 NSDate *choice = [selectTime date];
 NSString *message = [[NSString alloc] initWithFormat:@"The date is %@", choice];
 
 UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"The title" 
             message:message 
               delegate:nil 
            cancelButtonTitle:@"close" 
            otherButtonTitles:nil, nil];
 
 [alert show];
 [alert release];
 [message release];
 
 label.text = message;
 textField.text = message;
}
- (void)didReceiveMemoryWarning {
 // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
 
 // Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
 // Release any retained subviews of the main view.
 // e.g. self.myOutlet = nil;
 self.selectTime = nil;
 [super viewDidUnload];
}
- (void)dealloc {
 [selectTime release];
    [super dealloc];
}
@end
参考
YouTube - XCode 4 Tutorial Date Picker - Geeky Lemon Developmenthttp://www.youtube.com/watch?v=qW9nJgk9XwI&hd=1
|  詳解 Objective-C 2.0 改訂版: 荻原 剛志 |  iPhoneプログラミングUIKit詳解リファレンス: 所 友太, 京セラコミュニケーションシステム株式会社 |  iPhone SDK アプリケーション開発ガイド: Jonathan Zdziarski, 近藤 誠 (監訳), 武舎 広幸, 武舎 るみ | 
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