What does it mean UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:?
Solution 1
You need to register your cell using one of the relevant registration methods provided in the UICollectionView Class Reference
- (void)registerClass:(Class)cellClass forCellWithReuseIdentifier:(NSString *)identifier;
- (void)registerClass:(Class)viewClass forSupplementaryViewOfKind:(NSString *)elementKind withReuseIdentifier:(NSString *)identifier;
- (void)registerNib:(UINib *)nib forCellWithReuseIdentifier:(NSString *)identifier;
- (void)registerNib:(UINib *)nib forSupplementaryViewOfKind:(NSString *)kind withReuseIdentifier:(NSString *)identifier;
The relevant one of these only needs to be called once per instance of a UICollectionView
.
Solution 2
In case anyone hits this, another possibility is if you forget to return cell;
at the end of the collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
method.
Solution 3
Without storyboard you need to register your cell inside viewDidLoad :
// Register Nib
[self.collectionView registerNib:[UINib nibWithNibName:CollectionViewCell_XIB bundle:MAIN_BUNDLE] forCellWithReuseIdentifier:CollectionViewCell_ID];
CollectionViewCell_XIB
is the name of your cell xib
CollectionViewCell_ID
is the identifier of your cell xib
Related videos on Youtube
user4951
Updated on June 17, 2022Comments
-
user4951 about 2 years
Assertion failure in -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:]
I got this error since IOS 7. It works fine in IOS 6.
I look around the web and I found this:
http://forums.xamarin.com/discussion/8233/ios-7-crash-in-collectionview
However, the solution doesn't make sense
I figured it out. I had incorrectly used CollectionView.RegisterClassForCell. Apparently I was supposed to use CollectionView.RegisterNibForCell when setting up the viewcontroller. That fixed the problem. iOS 6 must have been more forgiving.
Could any of you give me a hint on this bug
Symptomps:
- Crash
- Assertion failure in -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:]
- Works in IOS6 and not IOS 7
The code I am suspicious with is this:
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { CGSize sz = [BGCollectionViewCellImage defaultSize]; return sz; }
But it seems to be too ordinary.
sz is simply CGSize of 100*120
Another is this:
- (BGCollectionViewCellImage *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { BGCollectionViewCellImage * cell = [[BGCollectionViewCellImage alloc]init]; Image * img= self.arImages[indexPath.row]; [cell setImg:img andIndex:indexPath.row+1]; return cell; }
Maybe I should use dequeue something like in UITableViewCell
I got another hint. If I tried to dequeue some cell, I got this:
2013-10-14 21:18:34.346 domainname[24667:a0b] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier BGCollectionViewCellImage - must register a nib or a class for the identifier or connect a prototype cell in a storyboard' * First throw call stack: (
Looks like I got to register something first.
-
Harrison Xi over 8 yearsLooks like that UICollectionView must create cell via reuse identifier.
-
Liron over 7 years@iNasir glad this helped.