webView

   一个小的浏览器。。。。。。。。。有后退，前进，刷新，停止，转到，本地，调js

_webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 40, self.view.frame.size.width, self.view.frame.size.height-40)];
    _webView.delegate = self;
    [self.view addSubview:_webView];

设置几个按钮，添加点击事件，设tag值0~6

后退：[_webView goBack];

前进：[_webView goForward];

刷新：[_webView reload];

停止：[_webView stopLoading];

转到：①首先判断前缀是否有http

         if(![_urlField.text hasPrefix:@"http"]){

                 _urlField.text = [NSString stringWithFormat:@"http://%@",_urlField.text];

          }

         ②发送请求,就会直接转到相应的网站中

          NSURL *url = [NSURL URLWithString:_urlField.text];

          NSURLRequest *request = [NSURLRequest requestWithURL:url];

          [_webView loadRequest:request];

本地：对于本地的html，首先得找到它的路径，将其变成字符串

         NSString *path = [[NSBundle mainBundle] pahtForResource:@"xml2" ofType:@"html"];

         //html字符串

         NSString *htmlStr = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

         [_webView loadHTMLString:htmlStr baseURL:nil];

调js：oc调js,已经有封装好的方法了，可以直接用

         [_webView stringByEvaluatingJavaScriptFromString:@"func()"];

每次刷新的时候，_textField中的网址没有显示，需要一个方法来让其刷新地址栏

 (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    //请求的地址,刷新地址栏
    _urlField.text = request.URL.absoluteString;
    //分割字符串
    NSArray *array = [_urlField.text componentsSeparatedByString:@"://"];
    if([array[0] isEqualToString:@"oc"]){
        //获取到javaScript想调用的方法名称
        SEL  sel = NSSelectorFromString(array[1]);
        [self performSelector:sel];
    }
    return YES;
}

- (void)ocFunc
{
    NSLog(@"OC........");
}