UITabbar disappears when i push view controller - ios

Question

This is my app delegate:
// Initialize your five tab controllers. with each tab has its own navigation controller
HomePageView *homePageView = [[HomePageView alloc]init];
UINavigationController *nav1 = [[UINavigationController alloc]initWithRootViewController:homePageView];
[nav1.navigationBar setTitleTextAttributes:#{NSForegroundColorAttributeName : [UIColor whiteColor]}];
// Set nav Bar to be completely transparent
[nav1.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
nav1.navigationBar.shadowImage = [UIImage new];
nav1.navigationBar.translucent = YES;
//Set Title
nav1.tabBarItem.title = #"Home";
ProfileViewController *profileViewController=[[ProfileViewController alloc]init];
UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:profileViewController];
// Set Title
nav2.tabBarItem.title = #"Profile";
// Set nav Bar to be completely transparent
[nav2.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
nav2.navigationBar.shadowImage = [UIImage new];
nav2.navigationBar.translucent = YES;
FeedViewController *feedViewController=[[FeedViewController alloc]init];
UINavigationController *nav3 = [[UINavigationController alloc]initWithRootViewController:feedViewController];
// Set nav Bar to be completely transparent
[nav3.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
nav3.navigationBar.shadowImage = [UIImage new];
nav3.navigationBar.translucent = YES;
// Set Title
nav3.tabBarItem.title = #"Feeds";
ListeningSessionViewController *listeningSessionViewController= [[ListeningSessionViewController alloc]init];
UINavigationController *nav4 = [[UINavigationController alloc]initWithRootViewController:listeningSessionViewController];
// Set nav Bar to be completely transparent
[nav4.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
nav4.navigationBar.shadowImage = [UIImage new];
nav4.navigationBar.translucent = YES;
// set Title
nav4.tabBarItem.title = #"Mussion";
RecievedViewController *recievedViewController =[[RecievedViewController alloc]init];
UINavigationController *nav5 = [[UINavigationController alloc]initWithRootViewController:recievedViewController];
// Set nav Bar to be completely transparent
[nav5.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
nav5.navigationBar.shadowImage = [UIImage new];
nav5.navigationBar.translucent = YES;
// Set Title
nav5.tabBarItem.title = #"Recieved";
// Set selected tab bar background
UIImage *whiteBackground = [UIImage imageNamed:#"whiteBackground"];
[[UITabBar appearance] setSelectionIndicatorImage:whiteBackground];
self.tabC.tabBar.translucent = YES;
// initialize tabbarcontroller,set your viewcontrollers and change its color.
self.tabC = [[UITabBarController alloc]init];
NSArray* controllers = [NSArray arrayWithObjects: nav1,nav2,nav3,nav4,nav5, nil];
[self.tabC setViewControllers: controllers animated:NO];
//[_window addSubview:self.tabC.view];
[self.window setRootViewController:self.tabC];
// Show window
[self.window makeKeyAndVisible];
return YES;
}
When i push a view controller from one of the tabbar controllers eg HomePageView, The tabbar disappears:
SearchSongViewController *Search_MusicTableView = [[SearchSongViewController alloc] init];
Search_MusicTableView.modalTransitionStyle=UIModalTransitionStyleCrossDissolve;
[self.navigationController presentModalViewController:Search_MusicTableView animated:YES];
When i present the modal view or even push another view controller, the tabbar disappears, please why is this ? and how do i fix it, Thanks alot !