objective c - Refresh UI after downloading data from server in iOS -

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i have download few data , display information in colection view. downloading data in loop. want refresh ui after downloading first data server. refreshing ui after downloading data. taking lot of time , user not wait long.as data saved locally refreshing ui this, 

[[nsnotificationcenter defaultcenter] postnotificationname:@"refresh" object:self];

the collection view delegates getting called late. how should handle situation.

if method of refreshing content, using nsnotificationcenter, works, should call on main thread calling in block.

just wrap around current code:

dispatch_async(dispatch_get_main_queue(), ^{     [[nsnotificationcenter defaultcenter] postnotificationname:@"refresh" object:self]; });

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