iOS UIWebView中添加手势

iOS开发中，在UIWebView中添加手势的方法如下：

 // 监控界面点击手势
        let singleTap = UITapGestureRecognizer(target: self, action: "singleTapAction:")
        
        // 注意：不做如下处理，无法监控到单击手势
        singleTap.cancelsTouchesInView = false
        singleTap.delegate = self
        
        self.webView.addGestureRecognizer(singleTap)

　　协议实现：

    // MARK: - UIGestureRecognizerDelegate
    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }