UICollectionView + iOS 7 / Xcode 5 =断言失败 [英] UICollectionView + iOS 7 / Xcode 5 = Assertion Failure

问题描述

在我的应用程序中有一个使用flowLayout的UICollectionView，它在iOS 6中工作得非常漂亮，但在iOS 7中运行失败。只要我看到包含我的UICollectionView的视图，就会发生以下情况：

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>>)

解决方案

当我更新到iOS 7时，我遇到了这个问题。问题最终是你不应该对你的dataSource这么明确。如果您有以下内容，请将其删除：

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;
}

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