iOS UIWebView 拦截点击事件(双击缩放)

在平时的开发中，要使用到webview，但类似微信的webview在数据没有加载完成的时候

双击屏幕，webview不会缩放，其实实现这个功能很简单

代码是用swift写的

 class YYSimpleWebViewController: UIViewController,UIWebViewDelegate,UIGestureRecognizerDelegate {

      var urlS :NSURL?
      var cusWebView :UIWebView!
      var  isLoaded = false
      let cover = UIView()

      init(WithUrl webUrl :NSURL?) {
         super.init(nibName: nil, bundle: nil)
         self.urlS = webUrl
         cusWebView = UIWebView()
         cusWebView.delegate = self
         NSURLCache.sharedURLCache().removeAllCachedResponses()
         NSURLCache.sharedURLCache().diskCapacity =
         NSURLCache.sharedURLCache().memoryCapacity = 

     }

     required init?(coder aDecoder: NSCoder) {
         fatalError("init(coder:) has not been implemented")
     }

     override func viewDidLoad() {
         super.viewDidLoad()
         cusWebView.frame = self.view.bounds
         self.view.addSubview(cusWebView)

         cover.backgroundColor          = UIColor.clearColor()
         cover.frame                    = cusWebView.bounds;
         cusWebView.scrollView.addSubview(cover)

         print(cusWebView.gestureRecognizers)
         let doubleTap                  = UITapGestureRecognizer(target: self, action: "tap")
         doubleTap.numberOfTapsRequired =
         doubleTap.delegate             = self
         cover.addGestureRecognizer(doubleTap)

         if self.urlS != nil {

              cusWebView.loadRequest(NSURLRequest(URL: self.urlS!))
         }

     }
     func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
         return true
     }

     func webViewDidFinishLoad(webView: UIWebView) {

         self.cover.removeFromSuperview()
         self.title = webView.stringByEvaluatingJavaScriptFromString("document.title")
     }

     func webView(webView: UIWebView, didFailLoadWithError error: NSError?) {
         self.cover.removeFromSuperview()
     }
     func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {

         return true
     }

     func tap() {

     }

核心思想就是在在webview的上边加一个透明的view，加载完成后移除，在加载过程中，拦截双击事件