我有一个 uitableview，其中嵌套了一个 Collection View 。 Collectionview 和 Tableview 都只有 1 个部分。在 collectionview 单元格中有 uiimageviews。我正在从服务器下载图片，下载图片后，我想在 ImageView 中显示它们。我正在调用 reloadItemsAtIndexPaths 以重新加载单元格的内容以显示图片。这是我到目前为止发现的:
如果我正在使用
[NSIndexPath indexPathWithIndex:[secondArray indexOfObject:dictionaryToRefresh]]
作为在 reloadItemsAtIndexPaths 中刷新的索引，然后第一张图片在 Collection View 的第一个单元格中加载得很好。 reloadItemsAtIndexPaths 也有很好的淡入效果。然后它因错误而严重崩溃:
Assertion failure in -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering:], /SourceCache/UIKit/UIKit-3347.44/UICollectionView.m:3835 2015-05-03 18:47:02.385 FBomb[3117:798045] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to delete section 1, but there are only 1 sections before the update'
如果我用
[NSIndexPath indexPathForItem:[secondArray indexOfObject:dictionaryToRefresh] inSection:0];
所有图片都加载得很好!但是没有淡入效果，这就是我想要实现的。关于我可以克服这个问题的任何想法？我想显示带有淡入淡出效果的图片(我真的不明白为什么它没有发生)
提前致谢，请原谅打字错误!
编辑1 完整代码:
-(void) reloadItemWithDictionary:(NSDictionary*)dictionaryToRefresh{
BOOL dictionaryFound = FALSE;
NSIndexPath *= [[NSIndexPath alloc]init];
NSIndexPath *indexPathSecondArray = [[NSIndexPath alloc] initWithIndex:0];
for (NSDictionary *firstDictionary in megaArray)
{
NSArray *secondArray = [firstDictionary objectForKey:@"subArray"];
if ([secondArray containsObject:dictionaryToRefresh]){
indexPathFirstArray = [NSIndexPath indexPathForRow:[megaArray firstDictionary] inSection:0];
//THIS FADES THE FIRST ITEM ONLY, THEN CREASHES
//indexPathSecondArray = [NSIndexPath indexPathWithIndex:[secondoArray indexOfObject:dictionaryToRefresh]];
//THESE WORKS, BUT THEY DON'T FADE
indexPathSecondArray = [NSIndexPath indexPathForItem:[secondoArray indexOfObject:dictionaryToRefresh] inSection:0];
//indexPathSecondArray = [NSIndexPath indexPathForRow:[secondoArray indexOfObject:dictionaryToRefresh] inSection:0];
dictionaryFound = TRUE;
break;
}
}
if ( dictionaryFound == TRUE){
dispatch_sync(dispatch_get_main_queue(), ^{
UITableViewCell *tableCell = [tableWithCollectionView cellForRowAtIndexPath:indexPathFirstArray];
UICollectionView *collectionViewInTableCell = (UICollectionView *)[tableCell viewWithTag:1000];
[collectionViewInTableCell performBatchUpdates:^{
[collectionView reloadItemsAtIndexPaths:@[indexPathSecondArray]];
} completion:^(BOOL finished){
}];
});
}
}
最佳答案
当你尝试这样做时会发生什么:
NSUInteger x[] = {[secondArray indexOfObject:dictionaryToRefresh] , 0};
//I don't know if the first element is section or item. try both.
//NSUInteger x[] = {0, [secondArray indexOfObject:dictionaryToRefresh]};
NSIndexPath *path = [[NSIndexPath alloc] initWithIndexes: x length: 2];
[collectionView reloadItemsAtIndexPaths:[NSArray arrayWithObject:path]];
indexPathWithIndex 仅使用一个 NSInteger 创建实例，而 UITableView 和 UICollectionView 需要 item/的两个值行和节
关于ios - reloadItemsAtIndexPaths 上的 Collection View 崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30016719/