Error could not dequeue a view of kind UICollectio

Question

Taking first plunge with collection views and am running into this error:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier Cell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'

The code is very simple, as shown below. I can't for the life of me figure out what it is that I'm missing.

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath];
cell.backgroundColor = [UIColor whiteColor]; 
return cell;
}

The collection view controller was created using a nib and the delegates & datasources are both set to file's owner.

View Controller's header file is also really basic.

@interface NewMobialViewController_3 : UICollectionViewController <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
@end

Answer 1

If you create it by code, you must create a custom UICollectionViewCell, Then, init a UICollectionView ,and use loadView to set the view is the UICollectionView that you create. If you create in viewDidload() , it does not work. In addition, you can also drag a UICollectionViewController, it saves a lot of time.

Answer 2

You need to use same identifier between the dequeueReusableCellWithReuseIdentifier's argument and the UICollectionViewCell's property.

UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CollectionViewCell" forIndexPath:indexPath];

Answer 3

If you are using storyboard instead of xib, here are few steps.

1. Making sure you fill the right identifier of your cell.

2. In the ColletionViewDelegate.

   func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
       let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "YourCellName", for: indexPath)as! YourCellName
       return cell            
   }
   

3. That's it. You also don't want to add registerClass:forCellWithReuseIdentifier: which will cause element nil error.

Answer 4

Swift4.0

Whenever your UITableViewCell is xib at that time you must have to register with UITableView.

override func viewDidLoad(){
    super.viewDidLoad()

    self.yourtableview.register(UINib(nibName: "yourCellXIBname", bundle: Bundle.main), forCellReuseIdentifier: "YourCellReUseIdentifier")
   }

Answer 5

From the UICollectionView documentation for the dequeue method:

Important: You must register a class or nib file using the registerClass:forCellWithReuseIdentifier: or registerNib:forCellWithReuseIdentifier: method before calling this method.

Answer 6

What fixed this for me was (roughly) same as Omar's answer, except I ended up creating a new UICollectionViewCell custom class and giving the Cell Reuse Indentifier a new / different name than the one that I had used elsewhere in the application. It worked immediately after that.