WKWebView中JS与Native进行交互

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WKWebView

WKWebView是现代 WebKit API 在 iOS 8 和 OS X Yosemite 应用中的核心部分。它代替了 UIKit 中的UIWebView和 AppKit 中的WebView，提供了统一的跨双平台 API。如果你的app只需要支持iOS8.0之后的版本，那么非常建议你使用WKWebView来替代UIWbeView，性能不止提升了一个档次。

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WKWebView与js交互

所谓轻应用，简单的来说就是原生应用集成了html页面入口，还能通过js与native实现交互，例如：通过js调用native封装好的viewController实现扫描与对应反馈功能。WKWebView初始化：

- (void)viewDidLoad {

  [superviewDidLoad];

  WKWebViewConfiguration*config = [[WKWebViewConfigurationalloc]init];

  [config.userContentControlleraddScriptMessageHandler:self.jsBridgename:@"observe"];

  self.webView= [[WKWebViewalloc]initWithFrame:CGRectMake(0,0,self.view.frame.size.width,                   self.view.frame.size.height)configuration:config];

  [self.viewaddSubview:self.webView];

  self.jsBridge= [JSBridgeManagerjsBridgeWithDelegate:self];

  self.webView.UIDelegate=self.jsBridge;

  self.webView.navigationDelegate=self.jsBridge;

  NSString*url = [self.pathstringByReplacingOccurrencesOfString:@" "withString:@""];

  ICLog(@"webView: %@", url);

  [self.webViewloadRequest:[NSURLRequestrequestWithURL:[NSURLURLWithString:url]]];

}

JSBridgeManager类里进行代理设置

简单的wkwebview的代理

页面开始加载时调用

  - (void)webView:(WKWebView*)webView didStartProvisionalNavigation:(WKNavigation*)navigation {

  NSLog(@"%s -- %@",__FUNCTION__, webView.URL);

  }

当内容开始返回时调用

  - (void)webView:(WKWebView*)webView didCommitNavigation:(WKNavigation*)navigation {

  NSLog(@"%s",__FUNCTION__);

  }

页面加载完成之后调用

  - (void)webView:(WKWebView*)webView didFinishNavigation:(WKNavigation*)navigation {

  NSLog(@"%s",__FUNCTION__);

  }

加载失败时调用

  - (void)webView:(WKWebView*)webView didFailProvisionalNavigation:(WKNavigation*)navigation withError:(NSError*)error {

  NSLog(@"%s",__FUNCTION__);

  }

接收到服务器跳转请求之后调用

  - (void)webView:(WKWebView*)webView       didReceiveServerRedirectForProvisionalNavigation:(WKNavigation*)navigation {

  NSLog(@"%s",__FUNCTION__);

  }

在收到响应后，决定是否跳转

  - (void)webView:(WKWebView*)webView decidePolicyForNavigationResponse:(WKNavigationResponse*)navigationResponse decisionHandler:(void(^)(WKNavigationResponsePolicy))decisionHandler {

  //允许跳转

  decisionHandler(WKNavigationResponsePolicyAllow);

  return;

  }

在发送请求之前，决定是否跳转<处理js与native交互代码>

  - (void)webView:(WKWebView*)webView decidePolicyForNavigationAction:(WKNavigationAction*)navigationAction decisionHandler:(void(^)(WKNavigationActionPolicy))decisionHandler {

  NSLog(@"%@", navigationAction.request.URL);

  NSURL*url = navigationAction.request.URL;

  if([[[urlscheme]lowercaseString]isEqualToString:kTGJSBridgeProtocolScheme]) {

  [selfdispatchNotification:[urlhost]fromWebView:webView];

  }else{

  //forward

  }

  decisionHandler(WKNavigationActionPolicyAllow);

  }

decidePolicyForNavigationAction能读取到由js发起的请求，native截取对应的url，读取与web端定义的协议规则，可进行通信

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
    
    NSDictionary *referDict = [[NSUserDefaults standardUserDefaults] objectForKey:@"loadUrlWithRefer"];
    
    if (![ICTools isObjEmpty:referDict]) {
        NSString *url = referDict[@"url"];
        NSString *refer = referDict[@"refer"];
        NSDictionary *headers = [navigationAction.request allHTTPHeaderFields];
        NSString * referer = [headers objectForKey:@"Referer"];
        BOOL isRightReferer = [referer isEqualToString:refer];
        if (isRightReferer) {
            decisionHandler(WKNavigationActionPolicyAllow);
        } else {
            decisionHandler(WKNavigationActionPolicyCancel);
            
            if ([url isEqualToString:[navigationAction.request.URL absoluteString]]) {
                NSMutableDictionary * muDict = [[NSMutableDictionary alloc] initWithDictionary:headers];
                [muDict setObject:refer forKey:@"Referer"];
                dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                    dispatch_async(dispatch_get_main_queue(), ^{
                        NSURL *url = [navigationAction.request URL];
                        NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:60.0];
                        request.allHTTPHeaderFields = muDict;
                        [webView loadRequest:request];
                    });
                });
            }
            [[NSUserDefaults standardUserDefaults] removeObjectForKey:@"loadUrlWithRefer"];// 使用完成后移除
        }
    } else {
        NSURL *url = navigationAction.request.URL;
        NSString *scheme = [url scheme];
        if ([scheme isEqualToString:kTGJSBridgeProtocolScheme]) {
            [self dispatchNotification:[url absoluteString] fromWebView:webView];
        }  else {
            //forward
            if (![scheme isEqualToString:@"https"] && ![scheme isEqualToString:@"http"]) {
                [[UIApplication sharedApplication] openURL:url];
            }
        }
        decisionHandler(WKNavigationActionPolicyAllow);
    }
}