tokens: I was doing : My original implementation downloaded images and saved them to CoreData , but although it is being triggered from a background thread ( a callback following the API call ) , the actual downloading of the images seems to cause the app to hang :
ner_tags: O O O O O O O O B-User_Interface_Element O O O O B-Library O O O O O O O O O O O O O O O O B-Library O O O O O O O O B-User_Interface_Element O O O O O O O O