Below is the simplest way that I've found to get this effect. It involves your collection view and an extra secret scroll view.
Set up your collection views
- Set up your collection view and all its data source methods.
- Frame the collection view; it should span the full width that you want to be visible.
Set the collection view's contentInset
:
_collectionView.contentInset = UIEdgeInsetsMake(0, (self.view.frame.size.width-pageSize)/2, 0, (self.view.frame.size.width-pageSize)/2);
This helps offset the cells properly.
Set up your secret scrollview
- Create a scrollview, place it wherever you like. You can set it to
hidden
if you like.
- Set the size of the scrollview's bounds to the desired size of your page.
- Set yourself as the delegate of the scrollview.
- Set its
contentSize
to the expected content size of your collection view.
Move your gesture recognizer
Add the secret scrollview's gesture recognizer to the collection view, and disable the collection view's gesture recognizer:
[_collectionView addGestureRecognizer:_secretScrollView.panGestureRecognizer];
_collectionView.panGestureRecognizer.enabled = NO;
Delegate
- (void) scrollViewDidScroll:(UIScrollView *)scrollView {
CGPoint contentOffset = scrollView.contentOffset;
contentOffset.x = contentOffset.x - _collectionView.contentInset.left;
_collectionView.contentOffset = contentOffset;
}
As the scrollview moves, get its offset and set it to the offset of the collection view.
I blogged about this here, so check this link for updates: http://khanlou.com/2013/04/paging-a-overflowing-collection-view/