Question

I was reading the documentation on Grand Central Dispatch, and there are two functions called Block_copy and Block_release.
According to the documentation these methods are being used while calling dispatch_async to take care of the memory management of the block. Am I suppose to do the same thing in my code?

Is there a problem with my code below?

typedef void (^MyCompletionHandler)(NSError *error)

@interface ServiceClient

- (void)fetchWithCompletionHandler:(MyCompletionHandler)completionHandler;

@property (nonatomic, assign) MyCompletionHandler completionHandler;

@end

@implementation ServiceClient
@synthesize completionHandler = _completionHandler;

- (void)fetchWithCompletionHandler:(MyCompletionHandler)completionHandler 
{
   self.completionHandler = completionHandler;
   [self performSelectorInBackground:@selector(fetchInBackground)];
}

@end

Answer 1

You should use the following declaration:

@property (nonatomic, copy) MyCompletionHandler completionHandler;

With assign your block will not be retained, but copy will perform Block_copy automatically.