Question

I have a UICollectionView with a series of thumbnails.
When I tap on a picture I want that it becomes full screen as happens in Photos App.
How can I do?

Answer 1

Use UICollectionView's delegate method:

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
  //get UIImage from source 
  //show (add subView) UIImageView with full screen frame
  //add gesture for double tap on which remove UIImageView
}