ios wkwebview

紹介する
WWDC 2014はios 8を発売し、webkit対応のWKWebViewはuiwebviewよりも強く、メモリ、ロード速度が優れている.

は性能、安定性、機能の面で

を大きく向上させた.

JavaScriptのNitroライブラリのロードと使用を許可する(UIWebViewで制限)

は、より多くのHTML 5プロパティ

をサポートしています.

最大60 fpsのスクロールリフレッシュ率および内蔵ジェスチャー

UIWebViewDelegateとUIWebViewを再構成する14クラスと3つのプロトコル

環境
Mac OS X 10.10.1
Xcode 6.1.1
iOS 8.1
初期化

#import 

//      
- (instancetype)initWithFrame:(CGRect)frame;

//    webview     ，     
- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration NS_DESIGNATED_INITIALIZER;

//    
WKWebView *webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];
[self.view addSubview:webView];

WKWebViewのエージェントメソッド
WKWebViewのエージェントメソッド
WKNavigationDelegate

//          
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation;
//           
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation;
//           
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation;
//          
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation;

//    
//               
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(WKNavigation *)navigation;
//       ，      
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
//        ，      
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;

実行順序:

webView:decidePolicyForNavigationAction:decisionHandler(            )
webView:didStartProvisionalNavigation
webView:decidePolicyForNavigationResponse:decisionHandler(       error  )
webView:didCommitNavigation
webView:didFinishNavigation

2. WKUIDelegate

//       WebView
- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures;

//   、   、   
/**
 *  web            
 *
 *  @param webView                 webview
 *  @param message                  
 *  @param frame                
 *  @param completionHandler        
 */
- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(void (^)())completionHandler;

3. WKScriptMessageHandler
Appとwebのインタラクションを向上させ、受信したJSスクリプトをOCまたはSwiftオブジェクトに変換

//  web             
- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message;

4.WKWebViewロードJS

//      js  
NSString *js = @"var count = document.images.length;for (var i = 0; i < count; i++) {var image = document.images[i];image.style.width=320;};window.alert('  ' + count + '  ');"; 

//   JS      WKUserScript   
WKUserScript *script = [[WKUserScript alloc] initWithSource:js injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES]; 
//      WKUserScript  ，   WKWebViewConfiguration 
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; 
[config.userContentController addUserScript:script]; 
_webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:config]; 
[_webView loadHTMLString:@"![](http://upload-images.jianshu.io/upload_images/832398-a96d086fbf5dc89c.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)" baseURL:nil];
[self.view addSubview:_webView];