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xmnx
9年前发布

iOS的UIWebView用法

UIWebView的使用方法

    //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;        }  

UIWebView的委托方法
    //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;