Infinite Loop of layoutAttributesForElementsInRect

Question

I have absolutely zero idea why this is happening, but for whatever reason a collection view I am using is infinitely looping the [UICollectionViewData layoutAttributesForElementsInRect:] method.

The collection view is inside of my custom navigation bar. In one scenario where I use this custom navigation bar, everything works as expected. In another scenario, it loops infinitely.

I have experimented with not setting the data source or delegate on the collectionView.
I have tried setting the data source and delegate, but returning 0 for itemsInSection.
I am using auto layout as in the working situation, and I am initialising the custom navigation bar as in the working situation.

In regard to posting code, I am not sure exactly what to post. The infinite loop begins after [UIWindow makeKeyAndVisible] is called. This method never returns. It was only after time profiling that I discovered that it was this [UICollectionViewData layoutAttributesForElementsInRect:] that was causing the problem.

score 13 · Accepted Answer · answered Jul 15 '14 at 12:45

13

I had the same infinite loop problem inside [UICollectionViewData layoutAttributesForElementsInRect:] when i was manually updating contentOffset to collectionView with no elements (i.e. when numberOfItemsInSection was 0).

answered Jul 15 '14 at 12:45

Andrew Rozdolsky

178
1
7

1

This comment saved our bacon. Thanks Andrew – jakev Jul 17 '14 at 21:27
Man, if I just have found your answer 2 days ago.. Big thanx. – codrut Feb 23 '16 at 17:21
In my case i was calling setNeedsLayout on the collection view's superview (setting the offset wasn't needed) – Nick H247 Sep 16 '16 at 12:57

score 1 · Answer 2 · answered May 10 '16 at 19:11

I had a problem with the heights of different collection views in a table view so i followed this UICollectionView inside a UITableViewCell — dynamic height?. But i mistakenly commented out the [self.collectionView layoutIfNeeded]; because i had thought it would improve scrolling performance. I uncommented it and it worked again! Not sure why it works though

Infinite Loop of layoutAttributesForElementsInRect

2 Answers2