UICollectionView's cellForItemAtIndexPath is not being called

Question

Only my second time using UICollectionView\'s and perhaps I have bitten off more than I can chew but nevertheless:

I am implementing a UICollectionView (myCollection

Answer 1

In my case, what I had very stupidly forgotten to do was implement the UICollectionViewDataSource protocol method numberOfItemsInSection, so that is another thing to check.

Answer 2

Same happened to me. I had 2 UICollectionViews and I removed once since I didn't need that. After that I realised that the CellForItemAtIndexPath was not getting called but the other required methods. I tried all of the above but then I did the standard magic. Removed the collection view from storyboard and added again. Then it started working. Not sure why and I have no explanation but maybe some connection issues.

Answer 3

It can be realated layout problems. Check layout warnings from console, if exist.

Answer 4

If your class is subclass from UICollectionviewController and you are creating collectionView programmatically then use

let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .Vertical
    layout.itemSize = CGSizeMake(50, 50)

    collectionView?.setCollectionViewLayout(layout, animated: false)

Answer 5

Also, make sure that reloadData is not called while collection view is updating with animation (insert, delete, update or performBatchUpdates).

Answer 6

If you're using collection view protocols you must connect the CollectionViewDataSource and CollectionViewDelegate protocols to your ViewController.