Error could not dequeue a view of kind UICollectionElementKindCell

问题:

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 

回答1:

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.

回答2:

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

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

回答3:

Complementing what @jrtuton written... What you need is:

1) Register your nib file to "connect" it with your identifier:

//MyCollectionView.m - (void) awakeFromNib{  [self registerNib:[UINib nibWithNibName:@"NibFileName" bundle:nil]   forCellWithReuseIdentifier: @"MyCellIdentifier"]; } 

2) Use your identifier to load your custom cell from a nib:

//MyCollectionView.m - (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath  *)indexPath {     MyCustomCollectionViewCell* cell = [cv dequeueReusableCellWithReuseIdentifier:@"MyCellIdentifier" forIndexPath:indexPath]; } 

3) Use always static NSString* to avoid the same identifiers again in your app.

回答4:

I know this is an old one, but I've experienced the same problem and wanted to share what fixed it for me.

In my case, I've declared a global identifier

let identifier = "CollectionViewCell" 

and had to use self right before using it:

collectionView.dequeueReusableCellWithReuseIdentifier(self.identifier, forIndexPath: indexPath) as! CollectionViewCell 

Hope this helps someone :)

回答5:

i had everything 100% done correctly. but for some reason i got the same error for an hour, then what i did is:

1. go to storyboard
2. select the prototype cell (in my case)
3. clear the class name from identity inspector, then rewrite it
4. rewrite the identifier name in the attributes inspector

simply, redid this step even tho i made it correct before, its like xcode misses something at a specific nanosecond!

回答6:

You need to give correct reuseble identifier in storyboard, which you have give in the code while registering the collectionViewCell.

Here is the code.

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

回答7:

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.

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