UICollectionView + iOS 7 / Xcode 5 = Assertion Failure
Solution 1
When I updated to iOS 7 I ran into this. The problem ended up being that you shouldn't be so explicit with your dataSource. If you have the following, remove it:
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
return nil;
}
Solution 2
It will crash if you return nil
in this function:
- (UICollectionReusableView*)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
Basically, the only reason you would have to return nil
is if the "kind" NSString
is not a type you expect. In that case, just delete that object in the interface builder. I had this same crash because my collection view had a footer in the interface builder but I was not calling the registerNib
code (as bneely described above) to set up a footer. I'd get to the viewForSupplementaryElementOfKind
and return nil because it was a kind I was not expecting.(which is guaranteed to cause the crash).
Solution 3
You need to register a UINib with your UICollectionView instance:
UINib *nib = [UINib nibWithNibName:@"YourNibNameWithoutExtension" bundle:nil];
[collectionView registerNib:nib forCellWithReuseIdentifier:@"YourReuseIdentifier"];
And create all of your UICollectionViewCell instances via -[UICollectionView dequeueReusableCellWithReuseIdentifier:forIndexPath:]
.
This comment in Apple's UICollectionView.h explains the requirement:
// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath;
Solution 4
I received this by forgetting to set my class to the correct type in interface builder and not wiring up and outlets
Solution 5
I've got this problem, as solved
I think you could check have you check the Section Header in IB Collection View -> Accessories -> Section Header
self.name
Updated on August 05, 2022Comments
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self.name almost 2 years
In my app there was a UICollectionView using flowLayout and it was working beautifully in iOS 6 but fails horribly in iOS 7. As soon as I segue to the view containing my UICollectionView here's what happens:
*** Assertion failure in -[UICollectionView _createPreparedSupplementaryViewForElementOfKind:atIndexPath:withLayoutAttributes:applyAttributes:], /SourceCache/UIKit/UIKit-2903.2/UICollectionView.m:1401 *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'the view returned from -collectionView:viewForSupplementaryElementOfKind:atIndexPath (UICollectionElementKindSectionHeader,<NSIndexPath: 0x145f3f50> {length = 2, path = 0 - 0}) was not retrieved by calling -dequeueReusableSupplementaryViewOfKind:withReuseIdentifier:forIndexPath: or is nil' (<UICollectionReusableView: 0x145f9400; frame = (0 0; 320 20); layer = <CALayer: 0x145f90c0>>)
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self.name over 10 yearsPerfect answer @ZaBlanc, thank you! Any idea what changed from iOS 6 to 7? The iOS 7 API Diffs don't show anything but additions to UICollectionView
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self.name over 10 yearsThanks @bneely, I was already registering nibs (and classes initially) but it turns out ZaBlanc's answer fixed the mystery crash. Don't ask me how/why because nothing in UICollectionView was really deprecated in the iOS7 API Diffs.
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Pavan about 7 yearsAha... something like this happened too! Thank you for this comment, it made me check my newly created reusable view.. now the internal inconsistency exception makes sense! :D