Customizing a UICollectionViewFlowLayout

You don't need to set the backgroundColor, but try to set the color in one of the delegate methods:

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    PhotoCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"icon" forIndexPath:indexPath];
    cell.backgroundColor = [UIColor lightGrayColor];
    cell.photo = self.photos[indexPath.row];
    return cell;
}

If you already have done that or it doesn't work, make sure you're returning the number of boxes to be displayed:

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    //Numbers of photos, so return the array count of photos.
    return 10;
}

Hi Thomas, Thank you so much for you're reply, I have tried all the code you sent it didn't work not sure, but still im not getting any error.

do you mind copy/pasting in what you have so I can take a look? :)

that the issue I can't see any error they only issue that i can't see the boxes for the photos. I happy to send you my project file.

okay. Send away :)

to what email ? my email is ghazouan@me.com

you can send your project zipped to -removed since question solved-

Sorry it took so long, it was hard to spot the error :P

you write

- (NSInteger)collectionview:(UICollectionView *)collectionView numberofItemsInSection:(NSInteger)section{
    return 10;
}

When it's supposed to be:

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
    return 10;
}

Do you spot the difference? If not -

you wrote 'collectionview' with small 'v' and 'numberofItemsInSection' with small 'o'

I feel so stupid now, thank you so much for you help, I can now move on with ur training.