在tableView代理方法以外对cell进行操作-更新单个cell-直接操作cell

#pragma mark 更新单个cell的方法
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0];
[self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

#pragma mark 直接获取对应位置的cell,对cell进行操作
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:12 inSection:0];
    ImageAttachmentCell *cell = (ImageAttachmentCell *)[self.tableView cellForRowAtIndexPath:indexPath];


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