如何在iOS的UIWebView中进行水平滚动？

我正在

UIWebView

中加载一个pptx文件，它正在加载，并且垂直滚动，但应该水平滚动。这是我的代码

readWebView=[[UIWebView alloc]initWithFrame:CGRectMake(0,0, [UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.height)];
     NSString *path=[[NSBundle mainBundle] pathForResource:@"MyPPT" ofType:@"pptx"];
      readWebView.scrollView.delegate=self;
        NSURL *url=[NSURL fileURLWithPath:path];
        NSURLRequest *request=[NSURLRequest requestWithURL:url];
        readWebView.scalesPageToFit=YES;
        readWebView.scrollView.showsVerticalScrollIndicator=false;
        readWebView.scrollView.showsHorizontalScrollIndicator=true;
        readWebView.scrollView.scrollEnabled=YES;
        readWebView.autoresizingMask=UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
        readWebView.scrollView.pagingEnabled=YES;
     [readWebView loadRequest:request];
    [self.view addSubview:readWebView];

像

readWebView.scrollView.delegate = self;
[readWebView.scrollView setShowsVerticalScrollIndicator:NO];


-(void)scrollViewDidScroll:(UIScrollView *)scrollVie
{
if (scrollVie.contentOffset.y > 0  ||  scrollVie.contentOffset.y < 0 )
    scrollVie.contentOffset = CGPointMake(scrollVie.contentOffset.x, 0);
}

readWebView.scrollView.delegate=self；
[readWebView.scrollView设置ShowsVerticalScrollIndicator:否]；
-（无效）scrollViewDidScroll：（UIScrollView*）scrollVie
{
if（scrollVie.contentOffset.y>0 | | scrollVie.contentOffset.y<0）
scrollVie.contentOffset=CGPointMake（scrollVie.contentOffset.x，0）；
}

启用水平滚动和禁用垂直滚动：

myWebView.scrollView.delegate = self;
[myWebView.scrollView setShowsVerticalScrollIndicator:NO];

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView.contentOffset.y > 0  ||  scrollView.contentOffset.y < 0 )
        scrollView.contentOffset = CGPointMake(scrollView.contentOffset.x, 0);
}

myWebView.scrollView.delegate = self;
[myWebview.scrollView setShowsHorizontalScrollIndicator:NO];

-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView.contentOffset.x > 0)
        scrollView.contentOffset = CGPointMake(0, scrollView.contentOffset.y);
}

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此代码使禁用滚动视图..添加此代码后没有滚动。您需要什么输出