ios - Load while push to another viewController -

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when push detail viewcontroller after clicking collectionview cell take time load detailview controller. mainviewcontroller.m

-(void)collectionview:(uicollectionview *)collectionview didselectitematindexpath:(nsindexpath *)indexpath{      detailviewcontroller *objdetailviewcontroller = [self.storyboard instantiateviewcontrollerwithidentifier:@"detailviewcontroller"];     objdetailviewcontroller.objproduct = [arrlist objectatindex:indexpath.row];     [self.navigationcontroller pushviewcontroller:objdetailviewcontroller animated:yes]; }

detailviewconteroller.m

- (void)viewdidload {      [super viewdidload];     [self setinitialvalues];     [self productdetailapi];//ws call  }

is api call running on main thread? should make network calls on background thread not block ui thread.


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