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POCalling UICollectionView#reloadData in UICollectionViewDelegate#collectionView:didSelectItemAtIndexPath: hides all cells
 

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  1. POCalling UICollectionView#reloadData in UICollectionViewDelegate#collectionView:didSelectItemAtIndexPath: hides all cells
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    <p>I have a UIViewController which has the following implementation for the didSelectItemAtIndexPath</p> <pre><code>@interface id section1Item NSMutableArray *section2Items NSMutableArray *section3Items @end @implementation - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == 0) { ; } else if (indexPath.section == 1) { self.section1Item = [self.section2Items objectAtIndex:indexPath.row]; } else { // indexPath.section == 2 id newSection2Item = [self.section3Items objectAtIndex:indexPath.row]; [self.section2Items addObject:newSection2Item]; [self.section3Items removeObject:newSection2Item]; } [collectionView reloadData]; } @end </code></pre> <p>The idea behind the code is that my collectionView has a static number of sections, and taping on an item in section 3 moves the item to section 2, and tapping on an item in section 2 makes it an item in section 1. </p> <p>However once I make the changes to my dataStructure (section1Item, section2Items and section3Items), and call reloadData, all my UICollectionView cells disappear. A few symptoms of the issue</p> <ol> <li>After the reloadData call, non of my dataSource methods get recalled. I tried putting a breakpoint in my implementation of numberOfSectionsInCollectionView and collectionView:numberOfItemsInSection but they don't get hit.</li> <li>I tried debugging using RevealApp, and I found out that after reloadData call, all my UICollectionViewCell's have their hidden property set to "YES", even though I don't have any code in my code base calling .hidden = YES;</li> <li>I also tried overriding UICollectionViewCell#setHidden to detect what (if any) part of the UIKit framework calls it, and again there was no breakpoint triggers.</li> </ol> <p>Tools details: I'm working with XCode5-DP6 on iOS7 simulator.</p> <p><strong>UPDATE:</strong> My UICollectionView shows all the cells correctly on first render.</p>
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    1. USArchit Baweja
    1. USArchit Baweja
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    1. COi supect if your datasource methods is not being called at all means your collectionview itself is nil somehow.
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      1. USbhawesh
    2. CO@BKC I updated my question, but the collectionView is non-nil because my initial render happens correctly.
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      1. USArchit Baweja
    3. COThere is a solution posted in another thread which worked for me - http://stackoverflow.com/a/14804429
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      1. USKirit Tanna
 

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