blocks|key|3974393|text|你必须使用WKWebView，它在框架'WebKit‘中的iOS8中可用来获得加速。如果你需要向后兼容，你必须为iOS7和更早的版本使用UIWebView。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3974394|我设置了一小段代码来为新的WKWebView提供UIViewController框架。它可以通过cocoapods安装。看看这里：|3974395|STKWebKitViewController+on+github|offset|length|style|CODE|3974396|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/sticksen/STKWebKitViewController^0|0|0|0|X|0|X|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@$F|U|G|V|H|I]]|9|@$F|W|G|X|1|Y]]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

You have to use WKWebView, which is available as of iOS8 in Framework 'WebKit' to get the speedup.
If you need backwards compatibility, you have to use UIWebView for iOS7 and older.

I set up a little code to provide the UIViewController frame for the new WKWebView. It can be installed via cocoapods. Have a look here:

<a href="https://github.com/sticksen/STKWebKitViewController" rel="nofollow"><code>STKWebKitViewController on github</code></a>

blocks|key|5391951|text|Swift不是必需的，使用Objective-C一切都很好。UIWebView将继续得到支持，因此如果您想从容不迫地进行迁移，则不必急于迁移。但是，它不会获得WKWebView的javascript和滚动性能增强。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5391952|为了向后兼容，我的视图控制器有两个属性:+UIWebView和WKWebView。我只在类存在的情况下才使用WKWebview：|5391953|if+([WKWebView+class])+{
++++//+do+new+webview+stuff
}+else+{
++++//+do+old+webview+stuff
}|code-block|syntax|javascript|5391954|虽然我以前有一个UIWebViewDelegate，但我也把它变成了一个WKNavigationDelegate并创建了必要的方法。|5391955|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Swift is not a requirement, everything works fine with Objective-C. UIWebView will continue to be supported, so there is no rush to migrate if you want to take your time. However, it will not get the javascript and scrolling performance enhancements of WKWebView.

For backwards compatibility, I have two properties for my view controller: a UIWebView and a WKWebView. I use the WKWebview only if the class exists:

<pre><code>if ([WKWebView class]) {
 // do new webview stuff
} else {
 // do old webview stuff
}
</code></pre>

Whereas I used to have a UIWebViewDelegate, I also made it a WKNavigationDelegate and created the necessary methods.

blocks|key|3974457|text|在iOS+8中使用Swift的WKWebView+..|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3974458|整个ViewController.swift文件现在看起来如下所示：|3974459|import+UIKit
import+WebKit

class+ViewController:+UIViewController+{

++++@IBOutlet+var+containerView+:+UIView!+=+nil
++++var+webView:+WKWebView?

++++override+func+loadView()+{
++++++++super.loadView()

++++++++self.webView+=+WKWebView()
++++++++self.view+=+self.webView!
++++}

++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()

++++++++var+url+=+NSURL(string:"http://www.kinderas.com/")
++++++++var+req+=+NSURLRequest(URL:url)
++++++++self.webView!.loadRequest(req)
++++}

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

}|code-block|syntax|javascript|3974460|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

WKWebView using Swift in iOS 8..

The whole ViewController.swift file now looks like this:

<pre><code>import UIKit
import WebKit

class ViewController: UIViewController {

 @IBOutlet var containerView : UIView! = nil
 var webView: WKWebView?

 override func loadView() {
 super.loadView()

 self.webView = WKWebView()
 self.view = self.webView!
 }

 override func viewDidLoad() {
 super.viewDidLoad()

 var url = NSURL(string:"http://www.kinderas.com/")
 var req = NSURLRequest(URL:url)
 self.webView!.loadRequest(req)
 }

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

}
</code></pre>

blocks|key|5392017|text|使用一些设计模式，你可以混合使用UIWebView和WKWebView。关键是要设计出一个独特的浏览器界面。但你应该更多地关注你的应用程序当前的功能，例如:如果你的应用程序使用NSURLProtocol来增强网络能力，那么使用WKWebView你就没有机会做同样的事情。由于NSURLProtocol仅影响当前进程，而WKWebView使用多进程架构，因此联网人员处于独立进程中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5392018|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

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.

blocks|key|1864484|text|UIWebView仍将继续使用现有的应用程序。从iOS8开始提供WKWebView，只有WKWebView有Nitro+JavaScript引擎。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1864485|要在较旧的应用程序中利用这种更快的JavaScript引擎，您必须更改代码以使用WKWebView而不是UIWebView。对于iOS7和更早的版本，您必须继续使用UIWebView，因此您可能必须检查iOS8，然后将WKWebView方法/委托方法应用于iOS7和更早版本的UIWebView方法。此外，目前还没有用于WKWebView的接口生成器组件，因此您必须以编程方式实现WKWebView。|1864486|您可以在Objective-C中实现WKWebView，下面是一个初始化WKWebView的简单示例|1864487|WKWebViewConfiguration+*theConfiguration+=+[[WKWebViewConfiguration+alloc]+init];
WKWebView+*webView+=+[[WKWebView+alloc]+initWithFrame:self.view.frame+configuration:theConfiguration];
webView.navigationDelegate+=+self;
NSURL+*nsurl=[NSURL+URLWithString:@"http://www.apple.com"];
NSURLRequest+*nsrequest=[NSURLRequest+requestWithURL:nsurl];
[webView+loadRequest:nsrequest];
[self.view+addSubview:webView];|code-block|syntax|javascript|1864488|在WebGL游戏和运行复杂JavaScript算法的东西中，WKWebView渲染性能是值得注意的，如果你使用webview加载简单的html或网站，你可以继续使用UIWebView。|1864489|以下是一个测试app，可用于使用UIWebView或WKWebView打开任何网站，您可以比较性能，然后决定升级您的应用程序以使用WKWebView：https://itunes.apple.com/app/id928647773?mt=8&at=10ltWQ|1864490|​|1864491|📷|atomic|1864492|1864493|entityMap|0|LINK|mutability|MUTABLE|url|https://itunes.apple.com/app/id928647773?mt=8&at=10ltWQ|1|2|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/7bbadd72c22301f98b61cc537276f053.jpeg|imageAlt^0|0|9|O|4|W|9|18|9|0|14|9|1G|9|1S|4|2A|9|2T|4|31|9|3K|4|3U|9|4G|9|5A|9|0|I|9|10|9|0|0|U|9|2A|9|0|G|9|Q|9|1T|9|7|3|0|23|1J|1|0|0|0|1|2|0|0^^$0|@$1|2|3|4|5|6|7|1D|8|@$9|1E|A|1F|B|C]|$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1M|8|@$9|1N|A|1O|B|C]|$9|1P|A|1Q|B|C]|$9|1R|A|1S|B|C]|$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]|$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|C]|$9|21|A|22|B|C]|$9|23|A|24|B|C]|$9|25|A|26|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|27|8|@$9|28|A|29|B|C]|$9|2A|A|2B|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|2C|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|2D|8|@$9|2E|A|2F|B|C]|$9|2G|A|2H|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|2I|8|@$9|2J|A|2K|B|C]|$9|2L|A|2M|B|C]|$9|2N|A|2O|B|C]]|D|@$9|2P|A|2Q|1|2R]|$9|2S|A|2T|1|2U]]|E|$]]|$1|S|3|T|5|6|7|2V|8|@]|D|@]|E|$]]|$1|U|3|V|5|W|7|2W|8|@]|D|@$9|2X|A|2Y|1|2Z]]|E|$]]|$1|X|3|T|5|6|7|30|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|31|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]|16|$5|11|12|13|E|$14|15]]|17|$5|18|12|19|E|$1A|1B|1C|-4]]]]

<code>UIWebView</code> will still continue to work with existing apps. <code>WKWebView</code> is available starting from <code>iOS8</code>, only <code>WKWebView</code> has a Nitro JavaScript engine. 

To take advantage of this faster JavaScript engine in older apps you have to make code changes to use <code>WKWebView</code> instead of <code>UIWebView</code>. For <code>iOS7</code> and older, you have to continue to use <code>UIWebView</code>, so you may have to check for <code>iOS8</code> and then apply <code>WKWebView</code> methods / delegate methods and fallback to <code>UIWebView</code> methods for <code>iOS7</code> and older. Also there is no Interface Builder component for <code>WKWebView</code> (yet), so you have to programmatically implement <code>WKWebView</code>.

You can implement <code>WKWebView</code> in Objective-C, here is simple example to initiate a <code>WKWebView</code>:

<pre class="lang-c prettyprint-override"><code>WKWebViewConfiguration *theConfiguration = [[WKWebViewConfiguration alloc] init];
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.frame configuration:theConfiguration];
webView.navigationDelegate = self;
NSURL *nsurl=[NSURL URLWithString:@"http://www.apple.com"];
NSURLRequest *nsrequest=[NSURLRequest requestWithURL:nsurl];
[webView loadRequest:nsrequest];
[self.view addSubview:webView];
</code></pre>

<code>WKWebView</code> rendering performance is noticeable in WebGL games and something that runs complex JavaScript algorithms, if you are using webview to load a simple html or website, you can continue to use <code>UIWebView</code>. 

Here is a test <a href="https://itunes.apple.com/app/id928647773?mt=8&amp;at=10ltWQ" rel="noreferrer">app</a> that can used to open any website using either <code>UIWebView</code> or <code>WKWebView</code> and you can compare performance, and then decide on upgrading your app to use <code>WKWebView</code>:
<a href="https://itunes.apple.com/app/id928647773?mt=8&amp;at=10ltWQ" rel="noreferrer">https://itunes.apple.com/app/id928647773?mt=8&amp;at=10ltWQ</a>

<img src="https://i.stack.imgur.com/uD5o0.jpg" alt="enter image description here">

blocks|key|5392110|text|下面是我从UIWebView过渡到WKWebView的过程。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|5392111|5392112|注意:没有像UIWebView这样的属性可以拖到你的故事板上，你必须通过编程来完成。|blockquote|5392113|5392114|5392115|确保将WebKit/WebKit.h导入到头文件中。|5392116|这是我的头文件：|5392117|#import+<WebKit/WebKit.h>

@interface+ViewController+:+UIViewController

@property(strong,nonatomic)+WKWebView+*webView;
@property+(strong,+nonatomic)+NSString+*productURL;

@end|code-block|syntax|javascript|5392118|下面是我的实现文件：|5392119|#import+"ViewController.h"

@interface+ViewController+()

@end


@implementation+ViewController

-+(void)viewDidLoad+{
++++[super+viewDidLoad];
++++self.productURL+=+@"http://www.URL+YOU+WANT+TO+VIEW+GOES+HERE";

++++NSURL+*url+=+[NSURL+URLWithString:self.productURL];
++++NSURLRequest+*request+=+[NSURLRequest+requestWithURL:url];

++++_webView+=+[[WKWebView+alloc]+initWithFrame:self.view.frame];++
++++[_webView+loadRequest:request];
++++_webView.frame+=+CGRectMake(self.view.frame.origin.x,self.view.frame.origin.y,+self.view.frame.size.width,+self.view.frame.size.height);
++++[self.view+addSubview:_webView];
}

-+(void)didReceiveMemoryWarning+{
++++[super+didReceiveMemoryWarning];
++++//+Dispose+of+any+resources+that+can+be+recreated.
}

@end|5392120|entityMap^0|5|9|H|9|0|0|0|0|0|3|F|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|15|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|16|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|17|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|18|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1C|8|@]|D|@]|E|$]]|$1|P|3|Q|5|R|7|1D|8|@]|D|@]|E|$S|T]]|$1|U|3|V|5|6|7|1E|8|@]|D|@]|E|$]]|$1|W|3|X|5|R|7|1F|8|@]|D|@]|E|$S|T]]|$1|Y|3|-4|5|6|7|1G|8|@]|D|@]|E|$]]]|Z|$]]

Here is how I transitioned from UIWebView to WKWebView. 

<blockquote>
 Note: There is no property like UIWebView that you can drag onto your
 storyboard, you have to do it programatically.
</blockquote>

Make sure you import WebKit/WebKit.h into your header file. 

This is my header file:

<pre><code>#import &lt;WebKit/WebKit.h&gt;

@interface ViewController : UIViewController

@property(strong,nonatomic) WKWebView *webView;
@property (strong, nonatomic) NSString *productURL;

@end
</code></pre>

Here is my implementation file:

<pre><code>#import "ViewController.h"

@interface ViewController ()

@end


@implementation ViewController

- (void)viewDidLoad {
 [super viewDidLoad];
 self.productURL = @"http://www.URL YOU WANT TO VIEW GOES HERE";

 NSURL *url = [NSURL URLWithString:self.productURL];
 NSURLRequest *request = [NSURLRequest requestWithURL:url];

 _webView = [[WKWebView alloc] initWithFrame:self.view.frame]; 
 [_webView loadRequest:request];
 _webView.frame = CGRectMake(self.view.frame.origin.x,self.view.frame.origin.y, self.view.frame.size.width, self.view.frame.size.height);
 [self.view addSubview:_webView];
}

- (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
 // Dispose of any resources that can be recreated.
}

@end
</code></pre>

blocks|key|1550049|text|根据Apple+docs的说法，WkWebView比UIWebview更快、更可靠。在这里，我发布了我的WkWebViewController。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1550050|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()
++++}

}|code-block|syntax|javascript|1550051|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/documentation/WebKit/Reference/WKWebView_Ref/^0|2|A|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

WkWebView is much faster and reliable than UIWebview according to the <a href="https://developer.apple.com/library/ios/documentation/WebKit/Reference/WKWebView_Ref/" rel="noreferrer">Apple docs</a>. 
Here, I posted my WkWebViewController.

<pre><code>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) -&gt; Void)){
 //print(navigationResponse.response.MIMEType)
 decisionHandler(.Allow)

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

}
</code></pre>

blocks|key|1864610|text|步骤:+1在ViewController.swift中导入webkit|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|1864611|import+WebKit|code-block|syntax|javascript|1864612|步骤:+2声明webView的变量。|1864613|var+webView+:+WKWebView!|1864614|步骤:+3添加WKNavigationDelegate的委托|1864615|class+ViewController:+UIViewController+,+WKNavigationDelegate{|1864616|步骤:4在ViewDidLoad中添加代码。|1864617|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)|1864618|步骤:+5编辑info.plist添加|1864619|<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
<key>NSExceptionDomains</key>
<dict>
<key>google.com</key>
<dict>
++++<key>NSExceptionAllowsInsecureHTTPLoads</key>
++++<true/>
++++<key>NSIncludesSubdomains</key>
++++<true/>
</dict>
</dict>|1864620|entityMap^0|0|5|6|K|T|6|0|0|0|5|0|0|0|5|7|K|0|0|0|M|5|B|0|0|0|J|7|A|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|D]|$9|18|A|19|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|1A|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|E|@]|F|$]]|$1|N|3|O|5|I|7|1E|8|@]|E|@]|F|$J|K]]|$1|P|3|Q|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|D]]|E|@]|F|$]]|$1|R|3|S|5|I|7|1K|8|@]|E|@]|F|$J|K]]|$1|T|3|U|5|6|7|1L|8|@$9|1M|A|1N|B|C]|$9|1O|A|1P|B|D]]|E|@]|F|$]]|$1|V|3|W|5|I|7|1Q|8|@]|E|@]|F|$J|K]]|$1|X|3|Y|5|6|7|1R|8|@$9|1S|A|1T|B|C]|$9|1U|A|1V|B|D]]|E|@]|F|$]]|$1|Z|3|10|5|I|7|1W|8|@]|E|@]|F|$J|K]]|$1|11|3|-4|5|6|7|1X|8|@]|E|@]|F|$]]]|12|$]]

Step : 1 Import <code>webkit</code> in <code>ViewController.swift</code>

<pre><code>import WebKit
</code></pre>

Step : 2 Declare variable of webView.

<pre><code>var webView : WKWebView!
</code></pre>

Step : 3 Adding Delegate of <code>WKNavigationDelegate</code>

<pre><code>class ViewController: UIViewController , WKNavigationDelegate{
</code></pre>

Step : 4 Adding code in <code>ViewDidLoad</code>.

<pre><code>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)
</code></pre>

Step : 5 Edit the <code>info.plist</code> adding 

<pre><code>&lt;dict&gt;
&lt;key&gt;NSAllowsArbitraryLoads&lt;/key&gt;
&lt;true/&gt;
&lt;key&gt;NSExceptionDomains&lt;/key&gt;
&lt;dict&gt;
&lt;key&gt;google.com&lt;/key&gt;
&lt;dict&gt;
 &lt;key&gt;NSExceptionAllowsInsecureHTTPLoads&lt;/key&gt;
 &lt;true/&gt;
 &lt;key&gt;NSIncludesSubdomains&lt;/key&gt;
 &lt;true/&gt;
&lt;/dict&gt;
&lt;/dict&gt;
</code></pre>

blocks|key|1864630|text|Swift+4|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1864631|++++let+webView+=+WKWebView()+++//+Set+Frame+as+per+requirment,+I+am+leaving+it+for+you
++++let+url+=+URL(string:+"http://www.google.com")!
++++webView.load(URLRequest(url:+url))
++++view.addSubview(webView)|code-block|syntax|javascript|1864632|entityMap^0|0|7|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

Swift 4

<pre><code> let webView = WKWebView() // Set Frame as per requirment, I am leaving it for you
 let url = URL(string: "http://www.google.com")!
 webView.load(URLRequest(url: url))
 view.addSubview(webView)
</code></pre>

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

<a href="http://developer.telerik.com/featured/why-ios-8s-wkwebview-is-a-big-deal-for-hybrid-development/">http://developer.telerik.com/featured/why-ios-8s-wkwebview-is-a-big-deal-for-hybrid-development/</a>
<a href="http://nshipster.com/wkwebkit/">http://nshipster.com/wkwebkit/</a>

But how does this affect existing apps? Will an ordinary UiWebView get the speedup from the nitro java script engine or do we need to make changes? How do we deal with backwards compatibility?

All the code and examples I can find are using swift, will this be mandatory?

Thankful for any help on this matter!

How to Migrate to WKWebView?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试了解如何在iOS8中使用新的WKWebView，找不到太多信息。我读过： 但这对现有的应用程序有什么影响呢？一个普通的UiWebView会从nitro java脚本引擎中获得加速吗?还是我们需要做一些改变？我们如何处理向后兼容性？我能找到的所有代码和示例都在使用swift，这是强制性的吗？感谢在这件事上的任何...

问如何迁移到WKWebView？
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问如何迁移到WKWebView？EN