单元格数量少，cell被居中

- (UIEdgeInsets)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {

    NSIntegerresult = 0;

    result = [self.contentData[section][kHDClassifyLeftTableViewModelDataKeyChildNode] count];

    if(result>1) {

      return  UIEdgeInsetsMake(0,0,0,0);

    }

    else

    {

       returnUIEdgeInsetsMake(0,0,0,(ScreenW-100)/2);

    }

}