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POCells are hidden using CollectionView
 

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  1. POCells are hidden using CollectionView
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    <p>I have a Navigation Controller pushing to a Collection View Controller. This collectionView has an <code>NSArray</code> of images, and I'm sure there are some elements in the collectionView using the method visibleCells. But when I launch it there is no displaying cells. Here is my code :</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; images = [NSArray arrayWithObjects:@"angry_birds_cake.jpg", @"creme_brelee.jpg", @"egg_benedict.jpg", @"full_breakfast.jpg", @"green_tea.jpg", @"ham_and_cheese_panini.jpg", @"ham_and_egg_sandwich.jpg", @"hamburger.jpg", @"instant_noodle_with_egg.jpg", @"japanese_noodle_with_pork.jpg", @"mushroom_risotto.jpg", @"noodle_with_bbq_pork.jpg", @"starbucks_coffee.jpg", @"thai_shrimp_cake.jpg", @"vegetable_curry.jpg", @"white_chocolate_donut.jpg", nil]; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return images.count; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{ static NSString *identifier = @"Cell"; UICollectionViewCell *cell; [collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"]; cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath]; NSArray *tab = [collectionView visibleCells]; for (int i = 0; i &lt; [tab count]; ++i) { NSLog(@"%d", i); } [collectionView setBackgroundColor:[UIColor blueColor]]; UIImageView *imageView = (UIImageView *)[cell viewWithTag:100]; imageView.image = [UIImage imageNamed:[images objectAtIndex:indexPath.row]]; return cell; } </code></pre> <p>Where am I wrong ? Thanks a lot.</p>
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    1. USFluffulousChimp
    1. USGezurb
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    1. COcheck if you actually have a `imageView` before you try to set the image. Insert `NSAssert(imageView, @"Must have a imageView");` in between `UIImageView *imageView = ...` and `imageView.image = ...`
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      1. POCells are hidden using CollectionView
      1. USMatthias Bauch
    2. CO`[collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"];` should be done in viewDidLoad or the likes, it should not be called each time cell is load, should be called only once.
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      1. USBooRanger
    3. COThanks for you replies. NSAssert throws an exception, how can i fix this to have an image ? And i don't know how to call this method only once. I have to call that method on a collectionView rewrite, isn't it ?
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      1. USGezurb
 

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