objective c - iOS Development - Using rootViewController correctly -

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i have been learning ios development few days now. @ moment, have questions on how rootviewcontroller used. searched web 3 hours yesterday looking answer turned quite few results never answered question.

i trying learn program app using code (no storyboards/xib files). trying understand how switch between views without using uinavigationcontroller. in project have main delegate creates window, initializes main view controller (which loads separate view well) , adds rootviewcontroller.

my first view has button calls function in controller switch next view. here question arises: switch main rootviewcontroller next view or load next view subview of rootviewcontroller? rootviewcontroller supposed encase views application? (i think how uinavigationcontroller works)

i have gotten switching of rootviewcontroller work in app, want make sure there isn't other way suppose manage views.

i not switch rootviewcontroller, think should remain stable. add subview, or can present modal view.

and of course, can change rootviewcontroller point new view if that's how want it.


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