Expand a UICollectionView in the middle of rows
I have a UICollectionView like following:
Is it possible to add scrollable content in the middle of rows on click of a cell like following: 
If yes, then how?
You can use this sample to your own need.
Expandable UICollectionView
What you can do is create 2 custom UICollectionView layouts. One without spacing and another one with it. Then animate change of the layout using method:
setCollectionViewLayout:animated:completion:
I'm going to have to assume you're using UICollectionViewFlowLayout for this purpose.
What you can simply do is add a new Cell at the desired indexPath and in the sizeForItemAtIndexPath datasource method, return the desired size (full width, required height). The flow layout will handle the rest for you.
Inside that cell, you can use a UIScrollView to get the Scrollable Content.
Update
Your cellForItemAtIndexPath:(NSIndexPath *)indexPath will look something like this
if(indexPath.item == myItemIndex && indexPath.section == myItemSection)
{
return CGSizeMake(768,200);
}
else
{
return CGSizeMake(128,128);
}
The values above are just examples. Modify them to suit your needs.
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