如何實現模式日期選擇器？

Question

我正在使用Ed Marty的回答中的代碼here，但我在幾位中遇到了麻煩。

點擊一個按鈕我已經有日期選擇器出現，但'完成'按鈕不是。

[delegate datePickerController:controller didPickDate:datePicker.date]; 

錯誤消息：

「控制器」未聲明（第一次在這個函數中使用）

總之，我有6個文件，我還從線得到一個錯誤：

• ModalDatePickerViewController.m
• ModalDatePickerViewController.h
• ModalDatePickerAppDelegate.m
• ModalDatePickerAppDelegate.h
• DatePickerController.m
• DatePickerController.h

我DatePickerController.h正在尋找這樣的：

#import <UIKit/UIKit.h> 


@class DatePickerController; 
@protocol DatePickerControllerDelegate 
- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date; 
@end 

@interface DatePickerController : UIViewController { 
    UIDatePicker *datePicker; 
    NSObject <DatePickerControllerDelegate> *delegate; 
} 

@property (nonatomic, retain) UIDatePicker *datePicker; 
@property (nonatomic, assign) NSObject <DatePickerControllerDelegate> *delegate; 
@end 

和DatePickerController.m：

#import "DatePickerController.h" 

@implementation DatePickerController 

@synthesize datePicker; 
@synthesize delegate; 

- (void) loadView { 
    self.view = [[[UIView alloc] init] autorelease]; 
    self.datePicker = [[[UIDatePicker alloc] init] autorelease]; 
    [self.view addSubview:self.datePicker]; 
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [button setTitle:@"Done" forState:UIControlStateNormal]; 
    button.center = CGPointMake(160,230); 
    [button addTarget:self action:@selector(done) forControlEvents:(UIControlEventTouchUpInside)]; 
    [self.view addSubview:button]; 
} 

- (void) done { 
    [delegate datePickerController:controller didPickDate:datePicker.date]; 
} 

- (void) dealloc { 
    [datePicker release]; 
    [super dealloc]; 
} 

@end 

在主視圖我有一個按鈕，調用這個類如下：

#import "ModalDatePickerViewController.h" 

@implementation ModalDatePickerViewController 

- (void) pickDate { 
    DatePickerController *screen = [[[DatePickerController alloc] init] autorelease]; 
    screen.delegate = self; 
    [self presentModalViewController:screen animated:YES]; 
} 

- (void) datePickerController:(DatePickerController *)controller didPickDate:(NSDate *)date { 
    //[self doSomethingWithDate:date]; 
    [controller dismissModalViewControllerAnimated:YES]; 
} 
- (IBAction)HitMe:(id)sender { 
    [self pickDate]; 
} 

- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
} 

- (void)viewDidUnload { 
} 

- (void)dealloc { 
    [super dealloc]; 
} 
@end 

和：

#import <UIKit/UIKit.h> 
#import "DatePickerController.h" 

@interface ModalDatePickerViewController : UIViewController <DatePickerControllerDelegate> { 

} 

- (IBAction)HitMe:(id)sender; 

@end 

Answer 1

在此行中：

[delegate datePickerController:controller didPickDate:datePicker.date];

嘗試用0123代替。