iOS：UIWebView

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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];            [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;

UIWebView布局

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