IOS 6的Xcode警告協議是沒有意義的

Question

在PSPoemsViewController.h我有一個協議，聲明如下：

@protocol PSPoemsViewControllerDelegate <NSObject> 

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 

@end 

，並在.m文件我有它的聲明：

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 
{ 
... 
} 

在PSVersionViewController。 h I類有：

@interface PSVersionViewController : UIPageViewController <PSPoemsViewControllerDelegate, UIPageViewControllerDataSource> 

當我編譯該編譯器會引發警告：

/Users/Keith/Documents/My Projects/Poem Shed/Poem Shed/PSVersionViewController.m:28:17: Method 'savePoem:withText:' in protocol 'PSPoemsViewControllerDelegate' not implemented

事情是代碼執行並找到應該丟失的方法。但是有一個奇怪的問題 - 即使沒有中斷設置，它有時會斷開方法，然後崩潰。這暗示着某種腐敗。我試過做一個乾淨的構建，刪除方法並將其放回，但沒有任何改變警告。我正在使用Xcode 6.1（它在測試版上也失敗了）。

Answer 1

所以：

@protocol PSPoemsViewControllerDelegate <NSObject> 

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 

@end 

@interface PSPOemsViewController : UIViewController 

@property (weak) id < PSPoemsViewControllerDelegate> delegate; 

@end 

然後在PSPoemsViewController.m當你想調用這個方法調用：在符合該委託添加方法的類

//Check that the delegate is set and that it has implemented the method. 
if ([self.delegate respondsToSelector:@selector(savePoem:withText:)]) 
    [self.delegate savePoem:YOUR_POEM withText:@"]; 

然後。所以在你的PSVersionViewController。確保你也設置了委託。

PSPoemsViewController *anInstanceofPoemsViewController = ..... 
[anIntanceOfPoemsViewController setDelegate:self]; 

然後添加方法：

- (void) savePoem:(Poem *)thePoem withText:(PSTextStorage *)theText; 
{ 
... 
}