ios - UIScrollView in UICollectionViewCell gestures handling -

i've seen people similar problems here, couldn't find working solution. have uicollectionview, fullscreen cells. scroll content horizontally (paging enabled). each cell has uiscrollview subview, covers entire cell. problem when use zoom-in functionality of uiscrollview, can't scroll 1 cell unless zoom-out 1.0 scale or reach border of uiscrollview content. idea use two-fingers pan gesture scroll collection view, use 1 finger scroll cell's internal uiscrollview. doesn't work , have no idea why. can provide more details, don't know might important.