Working with subviews on iPad

How are subviews created/开发者_开发百科arranged and managed on iPad?

If there is a main view controller that needs subviews. How are these views created and added to the view? Giving them positions within the main view.

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Each app usually has one UIWindow.

You can add subviews to that UIWindow. Most of the built in projects (like tab or split based) do that for you.