How do add a new collection in the collectionView & register a cell in viewDidLoad with the class? using the word photo?

Sam,

There seems to be something wrong with this challenge. I'm doing exactly what you are asking and I still can't get through. Here is my code.

#import "SuperCoolViewController.h"
#import "THPhotoCell.h"

@implementation SuperCoolViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    /* Write your code below this line */
    [self.collectionView registerClass:[THPhotoCell class] forCellWithReuseIdentifier:@"Photo"];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Photo" forIndexPath:indexPath];    
    return cell;
}
@end

Thanks Amit, I was thrown off course by the comment above that suggests using "dequeueReusableCellWithReuseIdentifier:forIndexPath: in cellForItemAtIndexPath:." This is a lot simpler than what it appears. I suggest rewording the challenge instructions or adding some additional comments to clarify.

Checkout the UICollectionView reference. You'll need registerClass:forCellWithReuseIdentifier: in viewDidLoad and dequeueReusableCellWithReuseIdentifier:forIndexPath: in cellForItemAtIndexPath:.