WKWebView捕获HTML弹出的Alert和Confirm

之前用WebView装载一个网页时，弹出Alert时会显示网址，由于不想把网址暴露给用户这样显示就不是很友好了。UIWebView文档内没有找到可以捕获这类信息的API。GOOGLE了下发现了WKWebView组件，WKWebView是IOS8新推出的组件，目的是给出一个新的高性能的 Web View 解决方案，摆脱过去 UIWebView 的老旧笨重特别是内存占用量巨大的问题。以下为示例代码：

//
//  ViewController.swift
//  KenWKWebView
//
//  Created by KenNgai on 10/10/15.
//  Copyright © 2015 IT. All rights reserved.
//
import UIKit
import WebKit //导入WebKit  WKWebView应该是用Webkit内核

class ViewController: UIViewController,WKNavigationDelegate,WKUIDelegate {

  var wkBrowser:WKWebView!

  override func viewDidLoad() {
    super.viewDidLoad()
    self.wkBrowser = WKWebView(frame: self.view.frame)
    //self.wkBrowser.loadRequest(NSURLRequest(URL: NSURL(string: "http://www.baidu.com")!))
    let html = "<html><title>Dialog</title><style type='text/css'>body{font-size:60px}</style><script type='text/javascript'>function myconfirm(){if(confirm('Star it?')){alert('Done')}}</script><body><a href="javascript:alert('Just Alert')" >Alert</a><br /><a href="javascript:myconfirm()">Logout</a></body></html>"
    self.wkBrowser.loadHTMLString(html, baseURL: nil)
    self.wkBrowser.navigationDelegate = self
    self.wkBrowser.UIDelegate = self
    self.view.addSubview(wkBrowser)
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }
}

//捕捉异常信息
private typealias wkNavigationDelegate = ViewController
extension wkNavigationDelegate {
  func webView(webView: WKWebView, didFailNavigation navigation: WKNavigation!, withError error: NSError) {
    NSLog(error.debugDescription)
  }

  func webView(webView: WKWebView, didFailProvisionalNavigation navigation: WKNavigation!, withError error: NSError) {
    NSLog(error.debugDescription)
  }
}

private typealias wkUIDelegate = ViewController
extension wkUIDelegate {
  //HTML页面Alert出内容
  func webView(webView: WKWebView, runJavaScriptAlertPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: () -> Void) {
    let ac = UIAlertController(title: webView.title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
    ac.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Cancel, handler: { 
      (a) -> Void in
      completionHandler()
    }))
    self.presentViewController(ac, animated: true, completion: nil)
  }

  //HTML页面弹出Confirm时调用此方法
  func webView(webView: WKWebView, runJavaScriptConfirmPanelWithMessage message: String, initiatedByFrame frame: WKFrameInfo, completionHandler: (Bool) -> Void) {
    let ac = UIAlertController(title: webView.title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
    ac.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler:{
      (ac) -> Void in
      completionHandler(true)  //按确定的时候传true
    }))

    ac.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler:{ 
      (ac) -> Void in
      completionHandler(false)  //取消传false
    }))

    self.presentViewController(ac, animated: true, completion: nil)
  }
}

如果你访问的页面的协议是https那么要在info.list同添加以下Key:

<key>NSAppTransportSecurity</key>
<dict>
  <key>NSAllowsArbitraryLoads</key>
  <true/>
</dict>

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