應用程序窗口預計將有在應用程序啓動年底

Question

我使用Facebook的iOS SDK安裝教程根視圖控制器：https://developers.facebook.com/docs/mobile/ios/build/

後第4步：添加註銷您的應用程序，

我得到一個空白屏幕上的5.1模擬器（xcode的4.3.2）和控制檯顯示一個消息：

應用窗口被預期具有在應用程序啓動的端部的根視圖控制器

EDIT-1

感謝您的答覆; 我在創建應用程序時選擇了「單一視圖應用程序」模板。在MainStoryBoard.storyboard中，我創建了一個對象併爲其分配了MyGreatIOSAppAppDelegate類。將此對象的viewController出口拖放到View Controller。

這裏是MyGreatIOSAppAppDelegate.m代碼

#import "MyGreatIOSAppAppDelegate.h" 
#import "xxxViewController.h" 

@implementation IJSAppDelegate 

@synthesize window = _window; 
@synthesize viewController = _viewController; 
@synthesize facebook; 

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    // Override point for customization after application launch. 
    self.window.rootViewController = self.viewController; 
    [self.window makeKeyAndVisible]; 

    // Add the logout button 
    UIButton *logoutButton = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    logoutButton.frame = CGRectMake(40, 40, 200, 40); 
    [logoutButton setTitle:@"Log Out" forState:UIControlStateNormal]; 
    [logoutButton addTarget:self action:@selector(logoutButtonClicked) 
      forControlEvents:UIControlEventTouchUpInside]; 
    [self.viewController.view addSubview:logoutButton];  

    facebook = [[Facebook alloc] initWithAppId:@"id" andDelegate:self]; 

    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    if ([defaults objectForKey:@"FBAccessTokenKey"] 
     && [defaults objectForKey:@"FBExpirationDateKey"]) { 
     facebook.accessToken = [defaults objectForKey:@"FBAccessTokenKey"]; 
     facebook.expirationDate = [defaults objectForKey:@"FBExpirationDateKey"]; 
    } 
    if (![facebook isSessionValid]) { 
     [facebook authorize:nil]; 
    } 
    return YES; 
} 


- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url 
    sourceApplication:(NSString *)sourceApplication annotation:(id)annotation { 
    return [facebook handleOpenURL:url]; 
} 

- (void)fbDidLogin { 
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    [defaults setObject:[facebook accessToken] forKey:@"FBAccessTokenKey"]; 
    [defaults setObject:[facebook expirationDate] forKey:@"FBExpirationDateKey"]; 
    [defaults synchronize]; 
} 

// Method that gets called when the logout button is pressed 
- (void) logoutButtonClicked:(id)sender { 
    [facebook logout]; 
} 

- (void) fbDidLogout { 
    // Remove saved authorization information if it exists 
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 
    if ([defaults objectForKey:@"FBAccessTokenKey"]) { 
     [defaults removeObjectForKey:@"FBAccessTokenKey"]; 
     [defaults removeObjectForKey:@"FBExpirationDateKey"]; 
     [defaults synchronize]; 
    } 
} 

@end 

Answer 1

檢查是否有下面的行應用程序委託的application:didFinishLaunchingWithOptions:方法：

self.window.rootViewController = self.viewController; 

Answer 2

確保您設置window.rootviewcontroller =您的_navigationviewcontroller。像這樣：（這一切都發生在你AppDelegate.cs文件）

公共部分類的AppDelegate：UIApplicationDelegate {// 類級別聲明 的UIWindow _window; UINavigationController _navigationcontroller;

// 
    // This method is invoked when the application has loaded and is ready to run. In this 
    // method you should instantiate the window, load the UI into it and then make the window 
    // visible. 
    // 
    // You have 17 seconds to return from this method, or iOS will terminate your application. 
    // 

    public override bool FinishedLaunching (UIApplication app, NSDictionary options) 
    { 
     // create a new window instance based on the screen size 
     _window = new UIWindow (UIScreen.MainScreen.Bounds); 

     // If you have defined a view, add it here: 
     // window.AddSubview (navigationController.View); 
     _navigationcontroller = new UINavigationController(); 
     _navigationcontroller.PushViewController(new SplashViewController(),false); 
     **_window.RootViewController = _navigationcontroller;** 

     // make the window visible 



    _window.MakeKeyAndVisible(); 

     return true; 
    } 
} 

}