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Question

    if(!isUserLoggedIn){

        var loginViewController = mainStoryBoard.instantiateViewControllerWithIdentifier("loginView") as! LoginViewController

        window!.rootViewController = loginViewController
        window!.makeKeyAndVisible()

    }else{

        var mainViewController = mainStoryBoard.instantiateViewControllerWithIdentifier("mainView") as! FirstViewController         
        var myDealsViewController  = mainStoryBoard.instantiateViewControllerWithIdentifier("myDealsViewController") as!MyDealsViewController            
        var settingsViewController  = mainStoryBoard.instantiateViewControllerWithIdentifier("settingsView") as! SettingsViewController            
        var centerNav = UINavigationController(rootViewController: mainViewController) as UINavigationController
        var myDealNavController = UINavigationController(rootViewController: myDealsViewController) as UINavigationController            
        let controllers = [centerNav,myDealNavController,settingsViewController]
        tabBarController.viewControllers = controllers

        window!.rootViewController = tabBarController
        window!.makeKeyAndVisible()          
    }

the above code is working but the app is not showing the tab bar item even though it works when I click on the center tab bar item.

Answer 1

Replace line of your code with :

var myDealNavController = mainStoryBoard.instantiateViewControllerWithIdentifier("myDealNavController") as! UINavigationController

And set "myDealNavController" as identifier to your UINavigationController in storyboard.