iOS的UIWebView用法

    //1.创建、设置代理  
        UIWebView *webView=[[UIWebView alloc] initWithFrame:CGRectMake(0,20,320,300)];  
        webView.delegate = self;  
    //2.加载网页  
        NSURL *url=[NSURL URLWithString:@"http://www.google.com.hk"];  
        NSURLRequest *request=[[NSURLRequest alloc] initWithURL:url];  
        [webView loadRequest:request];  
    //3.加载本地资源  
    NSURL* url = [NSURL fileURLWithPath:filePath];  
        NSURLRequest* request = [NSURLRequest requestWithURL:url];  
        [webView loadRequest:request];  
    //4.是否与用户交互（即用户能不能控制webview）  
        [webView setUserInteractionEnabled:YES];  
    //5.显示 UIWebView  
        [self.view addSubview:webView];  
    //6.导航  
        [webView goBack];//返回  
        [webView goForward];//向前  
        [webView reload];//重新加载数据  
        [webView stopLoading];//停止加载数据  
    //7.自动对页面进行缩放以适应屏幕  
        webView.scalesPageToFit = YES;  
    //8.自动检测网页上的电话号码，单击可以拨打  
        webView.detectsPhoneNumbers = YES;  
    //9.UIWebView 还支持将一个NSString对象作为源来加载。你可以为其提供一个基础URL，来指导UIWebView对象如何跟随链接和加载远程资源  
        [webView loadHTMLString:myHTML baseURL:[NSURL URLWithString:@"http://baidu.com"]];  
    //10.UIWebView和JS交互  
    //(1)在Objective-C代码中调用JS  
    //使用stringByEvaluatingJavaScriptFromString方法，需要等到UIWebView中的页面加载完成之后去调用。  
    -(void) webViewDidFinishLoad:(UIWebView *)webView{  
        [self.activityViewstopAnimating];  
        [myWebView stringByEvaluatingJavaScriptFromString:@"function test(){ alert(123123123)}"];  
        [myWebView stringByEvaluatingJavaScriptFromString:@"test();"];//调用  
    }  
    //(2)在JS中调用Objective-C代码  
        //JS代码：  
        function sendCommand(cmd,param){  
            var url="testapp:"+cmd+":"+param;  
            document.location = url;  
        }  
        function clickLink(){  
            sendCommand("alert","你好吗？");  
        }  
        //Objective-C代码：  
    - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {  
        NSString *requestString = [[request URL] absoluteString];  
        NSArray *components = [requestString componentsSeparatedByString:@":"];  
        if ([components count] > 1 && [(NSString *)[components objectAtIndex:0] isEqualToString:@"testapp"]) {  
            if([(NSString *)[components objectAtIndex:1] isEqualToString:@"alert"])  
            {  
                UIAlertView *alert = [[UIAlertView alloc]  
                                      initWithTitle:@"Alert from Cocoa Touch" message:[components objectAtIndex:2]  
                                      delegate:self cancelButtonTitle:nil  
                                      otherButtonTitles:@"OK",nil nil];  
                [alert show];  
            }  
            return NO;  
        }  
        return YES;  
    }  

    //1.web视图指示加载内容时通知。应该返回YES开始加载。导航提供的类型参数，是指请求的来源，可以是下列任何一个：  
    //UIWebViewNavigationTypeLinkClicked     用户触击了一个链接  
    //UIWebViewNavigationTypeFormSubmitted   用户提交了一个表单  
    //UIWebViewNavigationTypeBackForward     用户触击前进或返回按钮  
    //UIWebViewNavigationTypeReload          用户触击重新加载的按钮  
    //UIWebViewNavigationTypeFormResubmitted 用户重复提交表单  
    //UIWebViewNavigationTypeOther           发生其它行为  
    -(BOOL)webView:(UIWebView *)webView  shouldStartLoadWithRequest:(NSURLRequest *)request navigationType：(UIWebViewNavigationType)navigationType;  
      
    //2.开始加载的时候执行该方法。  
    - (void)webViewDidStartLoad:(UIWebView *)webView;  
      
    //3.加载完成的时候执行该方法。  
    - (void)webViewDidFinishLoad:(UIWebView *)webView;  
      
    //4.加载出错的时候执行该方法。  
    - (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;