collectionView必须点击两次才跳转

今天遇到一个很奇怪的现象：collectionView必须点击两次才能跳转。具体看代码：

-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"该项被触发");
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"选中了该项");
    self.hidesBottomBarWhenPushed = YES;
    ReadingViewController *vc = [ReadingViewController new];
    [self.navigationController pushViewController:vc animated:YES];
}

搜了一下资料发现didDelect是取消选定，于是将该行代码删除：

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"选中了该项");
    self.hidesBottomBarWhenPushed = YES;
    ReadingViewController *vc = [ReadingViewController new];
    [self.navigationController pushViewController:vc animated:YES];
}

运行发现仍然是需要点击两次才能出发didSelect方法，查找一翻资料后发现在collectionView的初始化时多加了一行代码，将其注释就可以正常运行了：

//self.collectionView.allowsMultipleSelection = YES;

该句代码通常适用有多行选择的需求时，将其注释后，就彻底解决collectionView点击两次才跳转的问题咯。