objective c - IOS Stop active queue -

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i have queue responsible download images table view, , want stop queue when table view reloaded or segue new view controller. have tried sort of verification inside block none seem work.

if(!imagequeue){     imagequeue = dispatch_queue_create("com.loadimages", null); }  dispatch_async(imagequeue, ^{      uiimage * image = [uiimage imagewithdata:[nsdata datawithcontentsofurl:                                              [nsurl urlwithstring: urlstring]]];   });


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