CODEWITHSUNDEEP
objective-cios
Johan de Klerk
Johan de Klerk

Reputation: 2535

Protocol Delegate doesn't get called

Hi Im trying to download a Photo from the internet using GCD. After the image is downloaded I call the delegate to let the class know that the image is downloaded.

Here is the code I use to download the image

-(void)getVenuePhotos:(NSString  *)venueID
{
    dispatch_queue_t  getVenuePhotos =  dispatch_queue_create ( "getVenuePhotos" ,  NULL );
    dispatch_async (getVenuePhotos, ^{

       //Download image, Lots of code not displaying
        UIImage *image  = [[UIImage alloc] initWithData:photoData];

        dispatch_async(dispatch_get_main_queue(),^{
            //This delegate doesn't get called
            [self.delegate gotVenuePhotos:image];  
        });
    });
    dispatch_release (getVenuePhotos);
}

Here is how I implemented my Protocol in my POIPhoto.h

@protocol POIPhotoProtocol <NSObject>
-(void)gotVenuePhotos:(UIImage *)image;
@end

@interface POIPhoto : NSObject

-(void)getVenuePhotos:(NSString *)venueID;

@property(nonatomic, weak) id <POIPhotoProtocol> delegate;

@end

And in my class I want the call back 

@interface PoiDetailViewController : UIViewController <POIPhotoProtocol>

And finaly I implement the protocol method

-(void)gotVenuePhotos:(UIImage *)image
{
   self.venuePhoto.image = image;
}

The problem is that the gotVenuePhotos never gets called even though in my image downloader the [self.delegate gotVenuePhotos:image]; gets called

Upvotes: 0

Views: 136

Answers (1)

Midhun MP
Midhun MP

Reputation: 107231

The issue is happening because you are not setting the delegate. In your viewDidLoad set the delegate like:

self.delegate = self;

Upvotes: 2

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