我有一个UICollectionView，最多可以加载UICollectionViewCells reloadItemsAtIndexPaths:。当我根据集合视图中的单元格数量调用reloadItemsAtIndexPaths:时，更新UI可能需要很长时间。我已经确定问题（在我的代码中无论如何）使用此代码位于collectionView:cellForItemAtIndexPath:和- (void)updateIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"starting reload of row %ld", (long)indexPath.row);
[self.collectionView reloadItemsAtIndexPaths:@[indexPath]];
NSLog(@"finished reload of row %ld", (long)indexPath.row);
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(@"begin creating cell at row %ld", (long)indexPath.row);
// Customise the cell
NSLog(@"end creating cell at row %ld", (long)indexPath.row);
return cell;
}
之间：
2014-03-14 13:07:10.949 Fotobox[2903:60b] starting reload of row 0
2014-03-14 13:07:10.954 Fotobox[2903:60b] begin creating cell at row 0
2014-03-14 13:07:10.974 Fotobox[2903:60b] end creating cell at row 0
2014-03-14 13:07:10.989 Fotobox[2903:60b] finished reload of row 0
（请注意，我一次只想更新1个indexPath）
当集合视图有5个单元格时，它只需要40毫秒：
2014-03-14 13:08:48.222 Fotobox[2903:60b] starting reload of row 0
2014-03-14 13:08:51.679 Fotobox[2903:60b] begin creating cell at row 0
2014-03-14 13:08:51.708 Fotobox[2903:60b] end creating cell at row 0
2014-03-14 13:08:51.725 Fotobox[2903:60b] finished reload of row 0
但对于316细胞而言需要3.4s：
{{1}}
我有什么办法可以加快速度吗？
我猜这是UICollectionView的内部信息，但我希望被证明是错误的。
感谢。