UIWebView

    UIWebView *web=[[UIWebView alloc]initWithFrame:self.view.frame];

    web.delegate=self;

    NSURL *URL=[NSURL URLWithString:@"http://baidu.com"];

    NSURLRequest *request=[NSURLRequest requestWithURL:URL];
    //让网页适应webview的大小
    web.scalesPageToFit=YES;
    //webView宽高自适应
    web.autoresizingMask = (UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth);

    [self.view addSubview:web];

    [web loadRequest:request];