iOS : ScrollView delegate method inside of CollectionView not call

Question

First I have set delegate in .h file

@interface ViewController : UIViewController<UICollectionViewDataSource, UIScrollViewDelegate>

After that just call this method in collection view .m file

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{

    NSLog(@"scrollViewDidScroll");
}

but not call this method.

Solution

Just do simple

add below line in .m file

yourCollectionView.delegate = self;

and below add in .h

UICollectionViewDelegate

remove

UIScrollViewDelegate