iOS標簽欄不顯示模態視圖

Question

我想在應用程序的開頭顯示模態視圖，但它不會出現。 這是我的代碼：

- (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;

}

我該如何解決？

Answer 1

首先，似乎沒有設置的self.viewController屬性，並且您實例化了兩次相同的“ViewController”。 這都是錯的：

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

嘗試將此代碼移動到profileViewController的viewDidLoad ...即讓TabBarController加載其第一個選項卡的視圖控制器。

Answer 2

從模型視圖中啟動一個instanse，如下所示：

modelView = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];

請按照以下列表：

1. 設置viewController模型呈現的樣式

    [modelView setModalPresentationStyle:UIModalPresentationPageSheet]; 

2. 然后使用：

    [self.viewController presentModalViewController:floorView animated:YES]; 

3. 然后，設置模型控制器的大小和位置，如下所示：

    modelView.view.superview.bounds = CGRectMake(0, 0, 700, 550);//it's important to do this after presentModalViewController modelView.view.superview.center = self.view.superview.center;//self.view assumes the base view is doing the launching, if not you might need self.view.superview.center etc. 

希望這對你有所幫助。