Run time viewcontroller

I am creating an app with a tab bar. However, when the app starts, I don't want it to display the t开发者_开发百科ab bar. Instead I would like to show a login page. After a successful log in, the tab bar based application should be shown.

Is this possible in code? I did it with Interface Builder.

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Just create a Window-based Application and create a ViewController with a TabBar that you can show once login is successful.

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Modal view controllers is the way you can do what you want. As it is said in the documentation

Modal view controllers are a tool that you have at your disposal for interrupting the current workflow and displaying a new set of views.