Fix the problem that uicollectionview does not reach the bottom security zone

Problem performance

Pictured
collectionView Did not reach the bottom of the screen ,

View layers

Fix code

if (@available(iOS 11.0, *)) {
        _collectionView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    } else {
        // Fallback on earlier versions
    }

Repair effect