iphone - iOS 标签栏不显示模态视图

Question

我想在应用程序的开头显示模态视图，但它没有出现。这是我的代码:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self initDataBase];
    CustomerModel *customer = [[[CustomerPersistor alloc] init] getLoggedCustomer];

    self.window.rootViewController = self.tabBarController;

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.

    UIViewController *profileViewController = [[[ProfileViewController alloc] initWithNibName:@"ProfileViewController" bundle:nil] autorelease];
    profileViewController.title = @"Profile";
    UINavigationController *profileNavigation = [[[UINavigationController alloc] initWithRootViewController:profileViewController] autorelease];

    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:profileNavigation,  nil];
    self.window.rootViewController = self.tabBarController;

    [self.window makeKeyAndVisible];

    if(customer == nil) { NSLog(@"HO");
        ViewController *login = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    //login.delegate = self.tabBarController.view;

        [self.viewController presentModalViewController:[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]  animated:YES];
    }
    return YES;

}

我该如何解决？

Answer 1

首先，似乎没有设置 self.viewController 属性，并且您正在实例化同一个“ViewController”两次。这都是错误的:

ViewController *login = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]; 
//login.delegate = self.tabBarController.view;
[self.viewController presentModalViewController:[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]  animated:YES]; 

尝试将此代码移动到您的 profileViewController 的 viewDidLoad 中...即让 TabBarController 与其第一个选项卡的 View Controller 一起加载。