iphone - Bug Loading Photo in Dispatch Queue -

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i have block of code here use load image on dispatch queue:

dispatch_async(dispatch_get_global_queue(0, 0), ^ {     cgimageref x = self.asset.defaultrepresentation.fullscreenimage;      dispatch_async(dispatch_get_main_queue(), ^     {         [[self imageview] setimage: [uiimage imagewithcgimage: x]];     }); });

the code seems work couple of times until bad access @ line [[self imageview] setimage: [uiimage imagewithcgimage: x]];. know causing this?

use

cgimageref x = cgimagecreatecopy(self.asset.defaultrepresentation.fullscreenimage);

and

cgimagerelease(x)

after set that


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