手動以array設定 tab bar view controller

//先new幾個view controller

//...

self.tabBarController = [UITabBarController new];

    self.tabBarController.delegate = self;

//再把它們以Array的形式傳入tab bar controller

self.tabBarController.viewControllers = [NSArray arrayWithObjects:storeTab, mapTab, chatTab, aboutTab, nil];

//把tab bar controller設為rootViewController

    self.window.rootViewController = self.tabBarController;

    self.window.rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext;

    [self.window makeKeyAndVisible];