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POWrong cells returned when dequeuing in custom UICollectionView
 

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  1. POWrong cells returned when dequeuing in custom UICollectionView
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    <p>I'm building an UICollectionView with a custom layout.</p> <p>The layout is 3x4 with horizontal scrolling. I got the layout of the cells and the page scrolling working just fine.</p> <p>My expected result is something like this:</p> <p><img src="https://i.stack.imgur.com/MZKuk.png" alt="enter image description here"></p> <p>(available at <a href="http://www.tinyuploads.com/images/0EVQnT.png" rel="nofollow noreferrer">http://www.tinyuploads.com/images/0EVQnT.png</a>)</p> <p>However, when scrolling it seems the wrongs cells are being dequeued, and instead my actual result is this: </p> <p><img src="https://i.stack.imgur.com/jMGDR.png" alt="enter image description here"></p> <p>(available at <a href="http://www.tinyuploads.com/images/8lvJId.png" rel="nofollow noreferrer">http://www.tinyuploads.com/images/8lvJId.png</a>)</p> <p>Furthermore, when I scroll back to first page "A" is no longer in the first position.</p> <p>My datasource and delegate methods looks like this:</p> <pre><code>#pragma mark - UIViewController Life Cycle - (void)viewDidLoad { [super viewDidLoad]; self.collectionView.backgroundColor = [UIColor colorWithWhite:0.25f alpha:1.0f]; self.alphabet = [NSMutableArray arrayWithObjects:@"A", @"B", @"C", @"D", @"E", @"F", @"G", @"H", @"I", @"J", @"K", @"L", @"M", @"N", @"O", @"P", @"Q", @"R", @"S", @"T", @"U", @"V", @"X", @"Y", @"Z", nil]; self.colors = [NSMutableArray arrayWithObjects:[UIColor colorWithRed:(135/255.0) green:(175/255.0) blue:(88/255.0) alpha:1], [UIColor colorWithRed:(65/255.0) green:(124/255.0) blue:(185/255.0) alpha:1], [UIColor colorWithRed:(201/255.0) green:(189/255.0) blue:(64/255.0) alpha:1], nil]; [self.collectionView reloadData]; } #pragma mark - UICollectionView datasource - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ return self.alphabet.count; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{ NSString *title = [self.alphabet objectAtIndex:indexPath.row]; UIColor *backgroundColor = [self.colors objectAtIndex:indexPath.row % 3]; CategoryCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CategoryCellIdentifier forIndexPath:indexPath]; cell.title.text = title; cell.backgroundColor = backgroundColor; [cell setNeedsLayout]; return cell; } #pragma mark - UICollectionViewDelegate - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{ NSLog(@"You touched: %d", indexPath.row); } </code></pre> <p>I'm in doubt of as how I should be thinking of sections. As you see here I have just one section containing all my items (contents of the alphabet).</p> <p>Any help is highly appreciated.</p>
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    1. USRob
    1. USJames Fox
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    1. COCan you post your custom layout code ?
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      1. USYaman
    2. COI too am interested in your question. Are you subclassing UICollectionViewFlowLayout? Are you using Autolayout or the old spring and struts? I found NOT using both of these meant that things worked but of course those are needed. Also you are using your own UICollectionViewCell class. Put in this method (void)prepareForReuse; in your cell class, you can then inspect the cell that is about to be reused. This might give you more insight into things.
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      1. USdarbid
    3. COThis is call Scrolling Problem,refer:http://stackoverflow.com/questions/14287353/error-setting-text-in-collection-view-cell/14289862#14289862
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      1. USLE SANG
 

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