Question

I am building a class that handles NSURLConnection requests. To allow other classes to use this class, I would like to allow the main class to call a delegate when connectionDidFinishLoading is fired.

I’ve looked through lots of documentation, but I can’t find anything that gives any clear examples, and the code that I have doesn’t call the delegate for some reason. The code I have so far is (code not relevant removed):

Interface:

@interface PDUrlHandler : NSObject { id delegate; } - (void)searchForItemNamed:(NSString *)searchQuery; @property (nonatomic, assign) id delegate; @end @interface NSObject (PDUrlHandlerDelegate)  - (void)urlHandler:(PDUrlhandler*)urlHandler searchResultsFinishedLoading:(NSDictionary *)resultData; @end 

Implementation:

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {     NSLog(@'Fininshed Loading...');     resultData = [self parseJSON:jsonData];      if(delegate && [delegate respondsToSelector:@selector(urlHandler:searchResultsFinishedLoading:)]) {         NSLog(@'Delegating!');         [delegate urlHandler:self searchResultsFinishedLoading:resultData];     } else {         NSLog(@'Not Delegating. I dont know why.');     }     } 

The delegate within the other class:

- (void)urlHandler:(PDUrlhandler*)urlHandler searchResultsFinishedLoading:(NSDictionary *)resultData; {     NSLog(@'Delegating!!!!'); } 

Answer 1

Turns out I forgot to set the delegate:

[currentHandler setDelegate:self]; 

needed to go after the line that makes the initial call to the PDUrlHandler.