去掉WebView的滚动条和下方黑线

    // 避免WebView最下方出现黑线
    webView.backgroundColor = [UIColor clearColor];
    webView.opaque = NO;
    
    // 去掉webView的滚动条
    for (UIView *subView in [webView subviews])
    {
        if ([subView isKindOfClass:[UIScrollView class]])
        {
            // 不显示竖直的滚动条
            [(UIScrollView *)subView setShowsVerticalScrollIndicator:NO];
        }
    }

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