Specify row and column number for UICollectionView

Try this:

// 1- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section {    return 2;}// 2- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView {    return 100;}// 3- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath {    MyCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];        cell.lbl.text = @"Data";    return cell;}

For 3 cells per row .. Add this code.

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{     return CGSizeMake(collectionView.frame.size.width/3.2 , 100);}

The more general approach to achieve n columns in collection view which is compatible in any orientation is

 func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {   // flow layout have all the important info like spacing, inset of collection view cell, fetch it to find out the attributes specified in xib file   guard let flowLayout = collectionViewLayout as? UICollectionViewFlowLayout else {        return CGSize()    }    // subtract section left/ right insets mentioned in xib view    let widthAvailbleForAllItems =  (collectionView.frame.width - flowLayout.sectionInset.left - flowLayout.sectionInset.right)    // Suppose we have to create nColunmns    // widthForOneItem achieved by sunbtracting item spacing if any    let widthForOneItem = widthAvailbleForAllItems / nColumns - flowLayout.minimumInteritemSpacing    // here height is mentioned in xib file or storyboard    return CGSize(width: CGFloat(widthForOneItem), height: (flowLayout.itemSize.height)) }