以编程方式将Tab Bar Controller添加到当前App Flow

I want to add a tab Bar Controller to my current App Flow. Currently I have a page with a button which on clicking opens a new viewcontroller with a web view where the user logs in and after login I want to take him to his home Page where the navigation bar has his name and a logout button in the right. The home page should also have a tab bar with 3 different tabs. I am able to load the home page view from the webview and get the navigation bar. But I am unable to add the tabBar and get it working. I am confused as to where to add the code for adding TabBar. I am using the below code to add tab bar - I want to add a tab Bar Controller to my curren