uiimageview - iOS UIImage Passes Old Image -

in app, im using api images server. using below code, gets images in order of size replace better quality.

dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{     nsurl *imageurl = [nsurl urlwithstring: [nsstring stringwithformat:@"%@", [[[self.information objectforkey:@"images"]objectforkey:@"normal"] description]]];     nsdata *imagedata = [nsdata datawithcontentsofurl:imageurl];     self.shotimage = [uiimage imagewithdata:imagedata];     self.image.image = self.shotimage; });  dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{     nsurl *imageurl = [nsurl urlwithstring: [nsstring stringwithformat:@"%@", [[[self.information objectforkey:@"images"]objectforkey:@"hidpi"] description]]];     nsdata *imagedata = [nsdata datawithcontentsofurl:imageurl];     uiimage *image = [uiimage imagewithdata:imagedata];     self.image.image = self.shotimage; }); 

also, if press on image takes viewcontroller image fullscreen.

however, if wait high quality 1 load before tap on it, in prepareforsegue method, still passes original low quality version.

see code below prepareforsegue

-(void)prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender {     fullsizeimageviewcontroller *vc = [segue destinationviewcontroller];     uiimage *img = [[uiimage alloc] init];     img = self.shotimage;     vc.shotimage = img;    } 

dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{     nsurl *imageurl = [nsurl urlwithstring: [nsstring stringwithformat:@"%@", [[[self.information objectforkey:@"images"]objectforkey:@"hidpi"] description]]];     nsdata *imagedata = [nsdata datawithcontentsofurl:imageurl];     uiimage *image = [uiimage imagewithdata:imagedata];     self.image.image = self.shotimage; }); 

in code looks miss line:

self.shotimage = [uiimage imagewithdata:imagedata];