UICollectionView reloadData not functioning properly in iOS 7

Question

I\'ve been updating my apps to run on iOS 7 which is going smoothly for the most part. I have noticed in more than one app that the reloadData method of a

Answer 1

 dispatch_async(dispatch_get_main_queue(), ^{

            [collectionView reloadData];
            [collectionView layoutIfNeeded];
            [collectionView reloadData];


        });

it worked for me.

Answer 2

Do you set UICollectionView.contentInset? remove the left and right edgeInset, everything is ok after I remove them, the bug still exists in iOS8.3 .

Answer 3

Check that each one of the UICollectionView Delegate methods does what you expect it to do. For example, if

collectionView:layout:sizeForItemAtIndexPath:

doesn't return a valid size, the reload won't work...

Answer 4

I also had this problem. By coincidence I added a button on top of the collectionview in order to force reloading for testing - and all of a sudden the methods started getting called.

Also just adding something as simple as

UIView *aView = [UIView new];
[collectionView addSubView:aView];

would cause the methods to be called

Also I played around with the frame size - and voila the methods were getting called.

There are a lot of bugs with iOS7 UICollectionView.

Answer 5

try this code.

 NSArray * visibleIdx = [self.collectionView indexPathsForVisibleItems];

    if (visibleIdx.count) {
        [self.collectionView reloadItemsAtIndexPaths:visibleIdx];
    }

Answer 6

I had exactly the same issue, however I managed to find what was going on wrong. In my case I was calling reloadData from the collectionView:cellForItemAtIndexPath: which looks not to be correct.

Dispatching call of reloadData to the main queue fixed the problem once and forever.

  dispatch_async(dispatch_get_main_queue(), ^{
    [self.collectionView reloadData];
  });