objective c - iOS8 Xcode6 UICollectionView sizeForIndexPath: does not get called on rotation -

my project has uicollectionview custom cell used work on iphone , ipad before ios8. in ipad on first load cells perfect on rotation

- (cgsize)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout*)collectionviewlayout sizeforitematindexpath:(nsindexpath *)indexpath 

does not called.

problem rotation logic goes , that's why uicollectionview twitches.

here solved it: added bottom line didrotatefrominterfaceorientation: method

-(void)didrotatefrominterfaceorientation:(uiinterfaceorientation)frominterfaceorientation{ [super didrotatefrominterfaceorientation:frominterfaceorientation]; [self.collectionview performbatchupdates:nil completion:nil]; 

}