UICollectview一般运用

／／取消选择状态   

 [collectionView deselectItemAtIndexPath:indexPathanimated:YES];

 cell.selectionStyle =UITableViewCellSelectionStyleNone;

 //点击的那一个cell滑到中间

    [tableView scrollToRowAtIndexPath:indexPathatScrollPosition:UITableViewScrollPositionMiddleanimated:YES];