UICollectionView reloadData 在 iOS 7 中无法正常运行 [英] UICollectionView reloadData not functioning properly in iOS 7

问题描述

我一直在更新我的应用程序以在 iOS 7 上运行，这在大多数情况下进展顺利.我在多个应用程序中注意到 UICollectionViewController 的 reloadData 方法不像以前那样表现得很好.

I've been updating my apps to run on iOS 7 which is going smoothly for the most part. I have noticed in more than one app that the reloadData method of a UICollectionViewController isn't acting quite how it used to.

我将加载UICollectionViewController，像往常一样用一些数据填充UICollectionView.这在第一次很有效.但是，如果我请求新数据(填充 UICollectionViewDataSource)，然后调用 reloadData，它将查询 numberOfItemsInSection 和 的数据源numberOfSectionsInCollectionView，但它似乎没有正确调用 cellForItemAtIndexPath 的次数.

I'll load the UICollectionViewController, populate the UICollectionView with some data as normal. This works great on the first time. However if I request new data (populate the UICollectionViewDataSource), and then call reloadData, it will query the data source for numberOfItemsInSection and numberOfSectionsInCollectionView, but it doesn't seem to call cellForItemAtIndexPath the proper number of times.

如果我将代码更改为仅重新加载一个部分，那么它将正常运行.改变这些对我来说没有问题，但我认为我不应该这样做.reloadData 应根据文档重新加载所有可见单元格.

If I change the code to only reload one section, then it will function properly. This is no problem for me to change these, but I don't think I should have to. reloadData should reload all visible cells according to the documentation.

有其他人看到过吗?

推荐答案

在主线程上强制执行:

dispatch_async(dispatch_get_main_queue(), ^ {
    [self.collectionView reloadData];
});

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