导航栏未显示

Question

这里有2个视图：

• WelcomeVC
• WebViewVC

AppDelegate 首先通过以下代码调用 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;
}

在WelcomeVC中，导航栏不会显示，可以使用navController.navigationBarHidden = YES;。在WelcomeVC中，有一个按钮可以调用以下详细信息的WebViewVC:

- (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，并像这样呈现导航栏： [webViewController.navigationController setNavigationBarHidden:NO animated:NO]; 但是我发现 WebViewVC 仍然没有呈现导航栏。我还在 WebViewVC 中包含了以下内容：viewDidLoad。

- (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];
}

请问有人能帮我指出哪里错了或者做错了吗？非常感谢。提前致谢！

- SanitLee

Answer 1

在这里，我通过更改WelcomeVC中按钮的代码找到了一种解决方案：

- (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];

}

- SanitLee

Answer 2

试试这个：

- (void)viewWillAppear:(BOOL)animated {

    self.navigationController.navigationBarHidden = NO;

}

- Jaideep Nagra

Answer 3

呼叫

[webViewController.navigationController setNavigationBarHidden:NO animated:NO];

在 - viewWillAppear 方法中

我也建议您使用以下内容更新框架

webView = [[UIWebView alloc] initWithFrame:[UIScreen mainScreen] bounds]];

- oks_ios

---

webViewVC中的viewWillAppear是什么？ - SanitLee

请问您能否检查一下，在-viewWillAppear方法中，是否有navigationController对象？ - oks_ios

你的评论帮我找到了解决方案，你有我的点赞和感谢。 - SanitLee