text: //
  //  ViewController.h
  //  PrecalculatedHeightColumnBasedUICollectionViewLayout example
  //
  //  Created by J C Ospina Gonzalez on 14-04-15.
  //
  
  #import <UIKit/UIKit.h>
  #import "PrecalculatedHeightColumnBasedUICollectionViewLayoutDataSource.h"
  
  @interface ViewController : UIViewController <UICollectionViewDataSource, UICollectionViewDelegate, PrecalculatedHeightColumnBasedUICollectionViewLayoutDataSource>{
      
      // model with dummie content
      NSMutableArray *content;
      
      // number of columns to present
      int numberColumns;
  }
  
  // UICollectionView
  @property (weak, nonatomic) IBOutlet UICollectionView *collectionView;
  @end
  
  