Is it safe to call dismissModalViewControllerAnimated within a modal view on iOS?

Is it safe to call dismissModalViewControllerAnimated within a modal view? or should it be called from the controller th开发者_开发知识库at initiated the modal view? If so how would I program that?

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The documentation does not make it clear what's going on (e.g. is it safe to do [self.parentViewController.parentViewController dismissModalViewControllerAnimated:NO]?), but in my testing you can dismiss the modal VC from either itself or its parent:

• From either VC, you can do [self dismissModalViewControllerAnimated:NO]
• From the parent VC, you can do [self.modalViewController dismissModalViewControllerAnimated:NO]
• From the modal VC, you can do [self.parentViewController dismissModalViewControllerAnimated:NO]