interface orientation doubts?

Question

anyone can tell differences among willRotateToInterfaceOrientation, willAnimateRotationToInterfaceOrientation, didRotateFromInterfaceOrientation,

Answer 1

From the UIViewController Class Reference:

willRotateToInterfaceOrientation:duration:

Sent to the view controller just before the user interface begins rotating.

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willAnimateRotationToInterfaceOrientation:duration:

Sent to the view controller before performing a one-step user interface rotation.

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didRotateFromInterfaceOrientation:

Sent to the view controller after the user interface rotates.