Objective-C 代码与Javascript 代码相互调用实例

-(void)webViewLoad{    NSURL * url = [[NSURL alloc]initWithString:@"http://www.baidu.com"];  self.webView = [[UIWebView alloc]initWithFrame:self.view.bounds];  NSURLRequest * request = [[NSURLRequest alloc]initWithURL:url];  self.webView.delegate = self;  [self.webView loadRequest:request];    [self.view addSubview:self.webView];  }//JS调用OC-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{  NSString * str = request.URL.relativeString;  if ([str isEqualToString:@"http://www.baidu.com/"]) {    NSLog(@"来找度娘");  }  return YES;}//OC调用JS-(void)webViewDidFinishLoad:(UIWebView *)webView{  NSString * str = [self.webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(""/"index-kw""/").value=""/"li""/""];  NSLog(@"webViewDidFinishLoad=%@",str);  }

-(void)webViewBridge{  self.webView = [[UIWebView alloc]initWithFrame:[UIScreen mainScreen].bounds];    NSString * path = [[NSBundle mainBundle]pathForResource:@"ExampleApp.html" ofType:nil];  NSURL * url = [[NSURL alloc]initFileURLWithPath:path];    [self.webView loadRequest:[NSURLRequest requestWithURL:url]];  self.webView.delegate = self;  [self.view addSubview:self.webView];  //设置能够桥接  [WebViewJavascriptBridge enableLogging];  //设置桥接   self.bridge =  [WebViewJavascriptBridge bridgeForWebView:self.webView];  //设置代理  [self.bridge setWebViewDelegate:self];  //JS调用OC（testObjcCallback是和html统一的方法名字）  [self.bridge registerHandler:@"testObjcCallback" handler:^(id data, WVJBResponseCallback responseCallback) {    NSLog(@"按钮点击了");    self.view.backgroundColor= [UIColor blackColor];    responseCallback(@"按钮点击了");  }];    }//OC调用JS-(void)webViewDidFinishLoad:(UIWebView *)webView{  NSLog(@"webViewDidFinishLoad");  [self.bridge callHandler:@"registerHandler"];}