UIWebView取消长按放大(用于长按识别二维码)

禁用长按UIWebView时放大镜及选择功能：
//通过js调用
- (void)webViewDidFinishLoad:(UIWebView*)webView
{
    // Disable user selection
    [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitUserSelect='none';"];
    // Disable callout，禁止长按链接弹出菜单，默认带有打开，拷贝，取消3个菜单项。
    [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitTouchCallout='none';"];
    //修改整个页面的字体大小
    [webView stringByEvaluatingJavaScriptFromString:@"document.getElementsByTagName_r('body')[0].style.webkitTextSizeAdjust= '150%';"];
    //修改点击链接时的高亮背景色
    [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitTapHighlightColor='#FF0000';"];
}