webview - ios取消右侧，下侧滚动条，去处上下滚动边界的黑色背景

UIWebView * d_intro = [[UIWebView alloc] init];
d_intro.delegate = self;
d_intro.dataDetectorTypes = UIDataDetectorTypeLink;
    //取消右侧，下侧滚动条，去处上下滚动边界的黑色背景
    d_intro.backgroundColor=[UIColor clearColor]; 
    for (UIView *_aView in [d_intro subviews])  
    { 
        if ([_aView isKindOfClass:[UIScrollView class]])  
        { 
            [(UIScrollView *)_aView setShowsVerticalScrollIndicator:NO]; 
            //右侧的滚动条 

            [(UIScrollView *)_aView setShowsHorizontalScrollIndicator:NO]; 
            //下侧的滚动条 
            
            for (UIView *_inScrollview in _aView.subviews)  
            { 
                if ([_inScrollview isKindOfClass:[UIImageView class]]) 
                { 
                    _inScrollview.hidden = YES;  //上下滚动出边界时的黑色的图片 
                } 
            } 
        } 
    }    
    [self.view addSubview:d_intro];