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iOS Build a Photo Browser iPhone App Collection Views Implementing a Custom UICollectionViewCell

Getting compiler error - "We want to dequeue new collection view cells in the collectionView property of this class".

We want to dequeue new collection view cells in the collectionView property of this class. Before we can do that, register a cell in viewDidLoad with the class THPhotoCell. Use the identifier "Photo".

I am not sure why I am getting a compiler error. Please help.

SuperCoolViewController.m
#import "SuperCoolViewController.h"

@implementation SuperCoolViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    /* Write your code below this line */
    [dequeueReuseableCellWithReuseIdentifier:@"Photo" forIndexPath:indexPath];

}
@end