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 = 0
NSURLCache.sharedURLCache().memoryCapacity = 0

}

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 = 2
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