Change PSTCollectionView to check the _collectionViewFlags for protocol conformance instead of calling respondsToSelector repeatedly
Change PSTCollectionView to check the _collectionViewFlags for protocol conformance instead of calling respondsToSelector repeatedly

niuxinghua/PSTCollectionView,ba01ei/PSTImprovedCollectionView,Anish-kumar-dev/PSTCollectionView,thevuuranusls/PSTCollectionView,StephaneDelcroix/PSTCollectionView,zace-yuan/PSTCollectionView,steipete/PSTCollectionView,Kevin775263419/PSTCollectionView,CorzFree/PSTCollectionView,jianwoo/PSTCollectionView,zjh171/PSTCollectionView,StephaneDelcroix/PSTCollectionView,Amnysia/PSTCollectionView,godLoveLucifer/PSTCollectionView