Dynamically change cell size according to image in a UICollectionView

Question

I am displaying dynamic images recieved from server in a horizontal collection view. When I set up the collectionview I set this:

-(void)setupCollectionView{
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Answer 1

However add an delegate method of UICollectionView.

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UIImageView *image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[arryOfImg objectAtIndex:indexPath.row]]];

    //You may want to create a divider to scale the size by the way..
    return CGSizeMake((image.frame.size.width)/4.0, (image.frame.size.height)/4.0);
}