Unwanted vertical scrolling in UICollectionView in iOS 7

Question

In my project I had created a custom layout for UICollectionView . In that layout, vertical scrolling is NOT possible, only horizontal scrolling is possible.

If that UIViewController is the only thing in the storyboard , layout is working perfectly, ie, there is no vertical scrolling, only horizontal scrolling is possible.

But if you add UINavigationController to storyboard , layout fails in iOS 7 (tested in simulator and device). Then vertical scrolling is ENABLED. You can scroll a little amount, may be 20 or 30 points.

But for iOS 6, layout is working perfectly with and without UINavigationController .(tested in iPhone).

Please help.

Thanks,

SOLUTION

I found solution to this.

In iOS 7, some inset was adding automatically to UICollectionView. So to fix it, add following code to ViewController self.automaticallyAdjustsScrollViewInsets = NO;

I found solution from https://stackoverflow.com/a/18989755/3117930

Hope this is helpful to someone Thanks,

Answer 1

what I can tell it tries to focus on the cell that was closest to the center of the pre-transition view layout. However, if there doesn't happen to be a cell at the center of the view pre-transition then it still tries to center where the cell would be post-transition. This is very clear if you set alwaysBounceVertical/Horizontal to YES, load the view with a single cell and then perform a layout transition.

I was able to get around this by explicitly telling the collection to focus on a specific cell (the first cell visible cell, in this example) after triggering the layout update.

[self.collectionView setCollectionViewLayout:[self generateNextLayout] animated:YES];

// scroll to the first visible cell
if ( 0 < self.collectionView.indexPathsForVisibleItems.count ) 
{
    NSIndexPath *firstVisibleIdx = [[self.collectionView indexPathsForVisibleItems] objectAtIndex:0];
    [self.collectionView scrollToItemAtIndexPath:firstVisibleIdx atScrollPosition:UICollectionViewScrollPositionCenteredVertically animated:YES];
}

Hopefully this will help you.