How to Migrate to WKWebView?

Question

I\'m trying to understand how to make use of the new WKWebView in iOS8, can\'t find much information. I\'ve read:

http://developer.telerik.com/featured/why-ios-8s-wk

Answer 1

Use some design patterns, you can mix UIWebView and WKWebView. The key point is to design a unique browser interface. But you should pay more attention to your app's current functionality, for example: if your app using NSURLProtocol to enhance network ability, using WKWebView you have no chance to do the same thing. Because NSURLProtocol only effects the current process, and WKWebView using muliti-process architecture, the networking staff is in a seperate process.

Answer 2

Step : 1 Import webkit in ViewController.swift

import WebKit

Step : 2 Declare variable of webView.

var webView : WKWebView!

Step : 3 Adding Delegate of WKNavigationDelegate

class ViewController: UIViewController , WKNavigationDelegate{

Step : 4 Adding code in ViewDidLoad.

let myBlog = "https://iosdevcenters.blogspot.com/"
let url = NSURL(string: myBlog)
let request = NSURLRequest(URL: url!)

// init and load request in webview.
webView = WKWebView(frame: self.view.frame)
webView.navigationDelegate = self
webView.loadRequest(request)
self.view.addSubview(webView)
self.view.sendSubviewToBack(webView)

Step : 5 Edit the info.plist adding

<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
<key>NSExceptionDomains</key>
<dict>
<key>google.com</key>
<dict>
    <key>NSExceptionAllowsInsecureHTTPLoads</key>
    <true/>
    <key>NSIncludesSubdomains</key>
    <true/>
</dict>
</dict>

Answer 3

WkWebView is much faster and reliable than UIWebview according to the Apple docs. Here, I posted my WkWebViewController.

import UIKit
import WebKit

class WebPageViewController: UIViewController,UINavigationControllerDelegate,UINavigationBarDelegate,WKNavigationDelegate{

    var webView: WKWebView?
    var webUrl="http://www.nike.com"

    override func viewWillAppear(animated: Bool){
        super.viewWillAppear(true)
        navigationController!.navigationBar.hidden = false

    }
    override func viewDidLoad()
    {
        /* Create our preferences on how the web page should be loaded */
        let preferences = WKPreferences()
        preferences.javaScriptEnabled = false

        /* Create a configuration for our preferences */
        let configuration = WKWebViewConfiguration()
        configuration.preferences = preferences

        /* Now instantiate the web view */
        webView = WKWebView(frame: view.bounds, configuration: configuration)

        if let theWebView = webView{
            /* Load a web page into our web view */
            let url = NSURL(string: self.webUrl)
            let urlRequest = NSURLRequest(URL: url!)
            theWebView.loadRequest(urlRequest)
            theWebView.navigationDelegate = self
            view.addSubview(theWebView)

        }


    }
    /* Start the network activity indicator when the web view is loading */
    func webView(webView: WKWebView,didStartProvisionalNavigation navigation: WKNavigation){
            UIApplication.sharedApplication().networkActivityIndicatorVisible = true
    }

    /* Stop the network activity indicator when the loading finishes */
    func webView(webView: WKWebView,didFinishNavigation navigation: WKNavigation){
            UIApplication.sharedApplication().networkActivityIndicatorVisible = false
    }

    func webView(webView: WKWebView,
        decidePolicyForNavigationResponse navigationResponse: WKNavigationResponse,decisionHandler: ((WKNavigationResponsePolicy) -> Void)){
            //print(navigationResponse.response.MIMEType)
            decisionHandler(.Allow)

    }
    override func didReceiveMemoryWarning(){
        super.didReceiveMemoryWarning()
    }

}