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

 1 class YYSimpleWebViewController: UIViewController,UIWebViewDelegate,UIGestureRecognizerDelegate {
 2 
 3      var urlS :NSURL?
 4      var cusWebView :UIWebView!
 5      var  isLoaded = false
 6      let cover = UIView()
 7     
 8      init(WithUrl webUrl :NSURL?) {
 9         super.init(nibName: nil, bundle: nil)
10         self.urlS = webUrl
11         cusWebView = UIWebView()
12         cusWebView.delegate = self
13         NSURLCache.sharedURLCache().removeAllCachedResponses()
14         NSURLCache.sharedURLCache().diskCapacity = 0
15         NSURLCache.sharedURLCache().memoryCapacity = 0
16     
17     }
18 
19     required init?(coder aDecoder: NSCoder) {
20         fatalError("init(coder:) has not been implemented")
21     }
22     
23 
24     
25     override func viewDidLoad() {
26         super.viewDidLoad()
27         cusWebView.frame = self.view.bounds
28         self.view.addSubview(cusWebView)
29         
30         
31         cover.backgroundColor          = UIColor.clearColor()
32         cover.frame                    = cusWebView.bounds;
33         cusWebView.scrollView.addSubview(cover)
34 
35         print(cusWebView.gestureRecognizers)
36         let doubleTap                  = UITapGestureRecognizer(target: self, action: "tap")
37         doubleTap.numberOfTapsRequired = 2
38         doubleTap.delegate             = self
39         cover.addGestureRecognizer(doubleTap)
40         
41         if self.urlS != nil {
42            
43              cusWebView.loadRequest(NSURLRequest(URL: self.urlS!))
44         }
45        
46         
47     }
48     func webView(webView: UIWebView, shouldStartLoadWithRequest request: NSURLRequest, navigationType: UIWebViewNavigationType) -> Bool {
49         return true
50     }
51     
52     func webViewDidFinishLoad(webView: UIWebView) {
53         
54         self.cover.removeFromSuperview()
55         self.title = webView.stringByEvaluatingJavaScriptFromString("document.title")
56     }
57     
58     func webView(webView: UIWebView, didFailLoadWithError error: NSError?) {
59         self.cover.removeFromSuperview()
60     }
61     func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldReceiveTouch touch: UITouch) -> Bool {
62         
63         return true
64     }
65    
66  
67     func tap() {
68         
69     }

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