导航栏未显示在iOS web视图中

Question

当用户单击非我的应用程序的按钮时，它将加载另一个包含web视图的视图。但是，导航不会显示在web视图中。有什么建议吗？

以下是我用来在web视图中加载的代码：

- (IBAction)visiteSite:(id)sender {  
    WebViewController *hospitalSite = [self.storyboard instantiateViewControllerWithIdentifier:@"hospitalSite"];
    hospitalSite.hospitalWebURL  = self.url;
    [self presentViewController:hospitalSite animated:YES completion:nil];
}

在Web视图上，我使用它来加载实际内容并生成导航栏：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    UIWebView *webView = [[UIWebView alloc] init];
    webView.frame = self.view.frame;
    [webView loadRequest:[NSURLRequest requestWithURL: self.hospitalWebURL]];
    [webView setScalesPageToFit:YES];
    [[self view] addSubview:webView];
    webView.clipsToBounds =YES;
    webView.frame =  CGRectMake(0,64,webView.frame.size.width,webView.frame.size.height-64);
    self.navigationController.navigationBar.alpha = 0.8f;
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:
                   [[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.viewController = [[UIViewController alloc]
                           initWithNibName:@"hospitalSite" bundle:nil];
    UINavigationController *navController = [[UINavigationController alloc]
                                             initWithRootViewController:self.viewController];
    //Navigation controller init with ViewController as root
    self.window.rootViewController = navController;
    [self.window makeKeyAndVisible];
    return YES;
}

网站在网页视图中加载，但我只是在顶部有一个空的白色栏，而不是导航栏。

有什么建议吗？

Answer 1

您的意思是将控制器呈现为模态吗？也许应该按以下方式推进？：

- (IBAction)visiteSite:(id)sender {  
    WebViewController *hospitalSite = [self.storyboard instantiateViewControllerWithIdentifier:@"hospitalSite"];
    hospitalSite.hospitalWebURL  = self.url;
    [[self navigationController] pushViewController:hospitalSite animated:YES];
}

此外，您可能希望在viewWillAppear或viewDidPear而不是viewDidLoad中执行与框架相关的代码，以便所有视图布局都已发生。否则，某些框架尺寸可能是错误的。