如何更改當前視圖控制器？

我有一個登錄視圖控制器向服務器請求認證。一旦成功，我希望當前視圖控制器成爲我的應用程序的主頁選項卡視圖控制器。我曾嘗試使用pushViewController：viewController或presentModalViewController或dismissModalViewControllerAnimated。什麼都沒有您可以查看提供的截圖以瞭解我的應用程序流程。如何更改當前視圖控制器？

下面是一些示例代碼：

- (IBAction)facebookLoginButtonClick:(id)sender { 

// get the app delegate so that we can access the session property 
AppDelegate *appDelegate = [[UIApplication sharedApplication]delegate]; 

// this button's job is to flip-flop the session from open to closed 
if (appDelegate.session.isOpen) { 
    // if a user logs out explicitly, we delete any cached token information, and next 
    // time they run the applicaiton they will be presented with log in UX again; most 
    // users will simply close the app or switch away, without logging out; this will 
    // cause the implicit cached-token login to occur on next launch of the application 
    [appDelegate.session closeAndClearTokenInformation]; 

} else { 
    if (appDelegate.session.state != FBSessionStateCreated) { 
     // Create a new, logged out session. 
     appDelegate.session = [[FBSession alloc] init]; 
    } 

    // if the session isn't open, let's open it now and present the login UX to the user 
    [appDelegate.session openWithCompletionHandler:^(FBSession *session, 
                FBSessionState status, 
                NSError *error) { 
     // and here we make sure to update our UX according to the new session state 
     [self dismissModalViewControllerAnimated:YES]; 
     UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone" bundle: nil]; 
     MainViewTabBarController *viewController = (MainViewTabBarController*)[mainStoryboard instantiateViewControllerWithIdentifier: @"mainPageTabBarId"]; 
     [[self navigationController] presentModalViewController:viewController animated:YES]; 
    }]; 
}

}

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來源

2012-09-22 flashsnake

當你說它不起作用時，你的意思是按鈕完全沒有響應？你在做錯誤檢查嗎？記錄語句以查看完成塊是否返回有效的FBSession？ – geraldWilliam

指向視圖控制器的2個箭頭的左側有沒有東西？它看起來像你有兩個控制器都設置爲初始控制器（這是不可能的，我不認爲）。 – rdelmar

按鈕響應。但應用程序崩潰。 – flashsnake

找出解決辦法。我應該改變應用程序委託中的rootViewController，而不是推動模型視圖控制器。它運作良好。感謝大家的幫助。

來源

2012-09-27 17:40:01 flashsnake

如何更改當前視圖控制器？

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