ios - Display of results is delayed by 5s in UISearchDisplayController -

my uisearchdisplaycontroller performs asynchronous searches via nsoperationqueue.

however results table not visually update until approximately 5s after nsoperation calls [searchdisplaycontroller.searchresultstableview reloaddata].

- (bool) searchdisplaycontroller:(uisearchdisplaycontroller*)controller shouldreloadtableforsearchstring:(nsstring*)searchstring {     [searchqueue cancelalloperations];     nsinvocationoperation *op = [[[customsearchoperation alloc] initwithcontroller:controller searchterm:searchstring] autorelease];     [searchqueue addoperation:op];      return no; } 

my customersearchoperation updates tableview so:

- (void) main {     // perform search      [searchdisplaycontroller setcontents:results];     [searchdisplaycontroller.searchresultstableview reloaddata]; } 

the problem ui updates must occur on main thread, , reloaddata being called background thread via nsoperationqueue.

you can use nsobject method performselectoronmainthread:withobject:waituntildone: ensure such updates occur on main thread.

- (void) main {     // perform search      [sdc setcontents:results];     [sdc.searchresultstableview performselectoronmainthread:@selector(reloaddata)                                 withobject:nil                                 waituntildone:no]; }