Automaticly adjust between portrait and landscape?

Let�s say I�m making a game for android/iOS and I want the game to be able to adjust to orientation on the fly, how is this done? I�m sure most of you know about and have tested Candycrush Saga. If the player changes the grip from holding the device in portrait to landscape the game automaticaly turns 90 degrees and adjusts the layout perfectly.

Any one done something like this before in C2?

Thanks