导航栏未显示

Question

在这里，我有2个意见：

• 欢迎VC
• WebViewVC

首先，AppDelegate通过以下代码调用WelcomeVC：

- (void)presentWelcomeViewController 
    WelcomeViewController *welcomeViewController = [[WelcomeViewController alloc] initWithNibName:@"WelcomeViewController" bundle:nil];

    welcomeViewController.title = @"Welcome to My App";

    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:welcomeViewController];
    navController.navigationBarHidden = YES;

    self.viewController = navController;
    self.window.rootViewController = self.viewController;
}

因此，在WelcomeVC中，导航栏不显示为navController.navigationBarHidden = YES;。在WelcomeVC中，有一个按钮来调用WebViewVC，如下所示：

- (IBAction)termsPressed:(id)sender {
    WebViewController *webViewController = [[WebViewController alloc] initWithNibName:nil bundle:nil];
    NSLog(@"Terms of Use");
    webViewController.urlPassed = @"http://.../term.html";
    webViewController.title = NSLocalizedString(@"Terms of Use", nil);
    [webViewController.navigationController setNavigationBarHidden:NO animated:NO];
    [self.navigationController presentViewController:webViewController animated:YES completion:^{}];    
}

当按下此按钮时，我希望它调用WebViewVC并显示导航栏，[webViewController.navigationController setNavigationBarHidden:NO animated:NO];但我发现WebViewVC的显示没有导航栏。我还在WebViewVC中包含viewDidLoad，如下所示：

- (void)viewDidLoad {
    [super viewDidLoad];

    CGSize screenSize = [[UIScreen mainScreen] bounds].size;
    if(screenSize.height == 480)
    {
        webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    }
    else if(screenSize.height == 568)
    {
        webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)];
    }

    [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlPassed]]];
    [self.view addSubview:webView];
}

有人能帮我指导我在哪里丢失或做错吗？这将不胜感激。提前致谢！

Answer 1

在这里，我通过更改WelcomeVC中按钮的代码找到了一个解决方案：

- (IBAction)termsPressed:(id)sender {
    WebViewController *webViewController = [[WebViewController alloc] initWithNibName:nil bundle:nil];
    NSLog(@"Terms of Use");
    webViewController.urlPassed = @"http://.../term.html";

    UINavigationController *webViewNavController =[[UINavigationController alloc] initWithRootViewController:webViewController];

    webViewNavController.navigationBarHidden = NO;

    webViewNavController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    [self presentViewController:webViewNavController animated:YES completion:nil];

}