탭 모음 컨트롤러보기에 두 번째 탭 모음을 추가 할 수 없습니다.

탭 막대 컨트롤러의 첫 번째보기 상단에 두 번째 탭 막대를 추가하려고하지만 어떤 이유로 맨 아래에있는 탭 막대를 제어하고 모든 것을 첫 번째 탭 버튼에 추가합니다. 나는 내가 뭘 잘못하고 있는지 볼 수 없으며 어떤 도움을 주시면 감사하겠습니다.

MainViewController *controller = self.storyboard.instantiateInitialViewController;

//************ Add Tab Bar ***********************************
self.tabsController = [[SGTabsViewController alloc] init];
self.tabsController.delegate = self;
self.window.rootViewController = self.tabsController;

[self.tabsController setToolbarHidden:NO animated:NO];

[self.tabsController addViewController:controller];

double delayInSeconds = 3.;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
    [self.tabsController setToolbarHidden:NO animated:YES];
});

self.textTabField = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 240.0, 30.0)];
self.textTabField.autoresizingMask = UIViewAutoresizingFlexibleWidth;
self.textTabField.backgroundColor = [UIColor whiteColor];
self.textTabField.borderStyle = UITextBorderStyleRoundedRect;
self.textTabField.text = @"http://www.google.com";
self.textTabField.clearButtonMode = UITextFieldViewModeAlways;
self.textTabField.keyboardType = UIKeyboardTypeURL;
self.textTabField.autocorrectionType = UITextAutocorrectionTypeNo;
self.textTabField.delegate = self;


UIBarButtonItem *urlBar = [[UIBarButtonItem alloc] initWithCustomView:self.textTabField];

UIBarButtonItem *space = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                                                                       target:nil action:nil];
UIBarButtonItem *reload = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh
                                                                        target:self action:@selector(reload:)];
UIBarButtonItem *add = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd
                                                                     target:self
                                                                     action:@selector(add:)];


self.tabsController.toolbarItems = [NSArray arrayWithObjects:space,urlBar,space,reload,add,nil];
self.tabsController.title = @"Loading...";