问正确地将导航控制器设置为uitab栏的根

EN

 // If the device is an iPad, we make it taller.
    _tabBarController = [[AKTabBarController alloc] initWithTabBarHeight:(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) ? 70 : 50];

 NSString * storyboardName = @"Main_iPhone";
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
    CurrentViewController * tab1VC = [storyboard instantiateViewControllerWithIdentifier:@"Tab1"];

    // dummy controllers
    CurrentViewController * tab2VC = [storyboard instantiateViewControllerWithIdentifier:@"Tab1"];
    CurrentViewController * tab3VC = [storyboard instantiateViewControllerWithIdentifier:@"Tab1"];
    CurrentViewController * tab4VC = [storyboard instantiateViewControllerWithIdentifier:@"Tab1"];


    [_tabBarController setViewControllers:[NSMutableArray arrayWithObjects:
                                           tab1VC,
                                           tab2VC,
                                           tab3VC,
                                           tab4VC,
                                           nil]];

    [_window setRootViewController:_tabBarController];
    [_window makeKeyAndVisible];

- (IBAction)dummyButton:(id)sender {
    NSString * storyboardName = @"Main_iPhone";
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
    UserSettingsSetupViewController *userSettingsSetupController = [storyboard instantiateViewControllerWithIdentifier:@"UserSettingsSetup"];
    [[self navigationController] pushViewController:userSettingsSetupController animated:YES];
}