簡(jiǎn)介

WKWebView相對(duì)于UIWebView強(qiáng)大了很多，內(nèi)存的消耗相對(duì)少了，所提供的接口也豐富了。

現(xiàn)在談一談WKWebView的基本使用

• navigationDelegate

- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation { // 類似UIWebView的 -webViewDidStartLoad:
    NSLog(@"didStartProvisionalNavigation");
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}

- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    NSLog(@"didCommitNavigation");
}

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation { // 類似 UIWebView 的 －webViewDidFinishLoad:
    NSLog(@"didFinishNavigation");
    [self resetControl];
    if (webView.title.length > 0) {
        self.title = webView.title;
    }
}
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(WKNavigation *)navigation withError:(NSError *)error {
    // 類似 UIWebView 的- webView:didFailLoadWithError:
    
    NSLog(@"didFailProvisionalNavigation");
    
}
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {
    
    decisionHandler(WKNavigationResponsePolicyAllow);
}


- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    // 類似 UIWebView 的 -webView: shouldStartLoadWithRequest: navigationType:
    
    NSLog(@"4.%@",navigationAction.request);
    NSString *url = [navigationAction.request.URL.absoluteString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    
    decisionHandler(WKNavigationActionPolicyAllow); 
}
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler {
    
}

• UIDelegate

- (WKWebView *)webView:(WKWebView *)webView createWebViewWithConfiguration:(WKWebViewConfiguration *)configuration forNavigationAction:(WKNavigationAction *)navigationAction windowFeatures:(WKWindowFeatures *)windowFeatures {
    // 接口的作用是打開新窗口委托
    [self createNewWebViewWithURL:webView.URL.absoluteString config:configuration];
    
    return currentSubView.webView;
}

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)())completionHandler
{    // js 里面的alert實(shí)現(xiàn)，如果不實(shí)現(xiàn)，網(wǎng)頁(yè)的alert函數(shù)無(wú)效
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler();
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
    
}
- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler {
    //  js 里面的alert實(shí)現(xiàn)，如果不實(shí)現(xiàn)，網(wǎng)頁(yè)的alert函數(shù)無(wú)效  , 

    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message
                                                                             message:nil
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [alertController addAction:[UIAlertAction actionWithTitle:@"確定"
                                                        style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          completionHandler(YES);
                                                      }]];
    [alertController addAction:[UIAlertAction actionWithTitle:@"取消"
                                                        style:UIAlertActionStyleCancel
                                                      handler:^(UIAlertAction *action){
                                                          completionHandler(NO);
                                                      }]];
    
    [self presentViewController:alertController animated:YES completion:^{}];
    
}

- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString *))completionHandler {
    
    completionHandler(@"Client Not handler");  
}

• WKWebView 執(zhí)行腳本方法

- (void)evaluateJavaScript:(NSString *)javaScriptString completionHandler:(void (^)(id, NSError *))completionHandler;
//completionHandler 擁有兩個(gè)參數(shù)，一個(gè)是返回錯(cuò)誤，一個(gè)可以返回執(zhí)行腳本后的返回值

• WKWebView 的Cookie問題

UIWebView 中會(huì)自動(dòng)保存Cookie，如果登錄了一次，下次再次進(jìn)入的時(shí)候，會(huì)記住登錄狀態(tài)
而在WKWebView中，并不會(huì)這樣，WKWebView在初始化的時(shí)候有一個(gè)方法

- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration
//通過(guò)這個(gè)方法，設(shè)置 configuration 讓W(xué)KWebView知道登錄狀態(tài)，configuration 可以通過(guò)已有的Cookie進(jìn)行設(shè)置，也可以通過(guò)保存上一次的configuration進(jìn)行設(shè)置
//參考 stackoverflow上回答：http://stackoverflow.com/questions/26573137/can-i-set-the-cookies-to-be-used-by-a-wkwebview/26577303#26577303

WKWebView * webView = /*set up your webView*/
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://example.com/index.html"]];
[request addValue:@"TeskCookieKey1=TeskCookieValue1;TeskCookieKey2=TeskCookieValue2;" forHTTPHeaderField:@"Cookie"];
// use stringWithFormat: in the above line to inject your values programmatically
[webView loadRequest:request];

WKUserContentController* userContentController = WKUserContentController.new;
WKUserScript * cookieScript = [[WKUserScript alloc] 
    initWithSource: @"document.cookie = 'TeskCookieKey1=TeskCookieValue1';document.cookie = 'TeskCookieKey2=TeskCookieValue2';"
    injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
// again, use stringWithFormat: in the above line to inject your values programmatically
[userContentController addUserScript:cookieScript];
WKWebViewConfiguration* webViewConfig = WKWebViewConfiguration.new;
webViewConfig.userContentController = userContentController;
WKWebView * webView = [[WKWebView alloc] initWithFrame:CGRectMake(/*set your values*/) configuration:webViewConfig];