Add a presentedFrame API to the transition controller.

Authored by featherless on Mon, Apr 17, 5:02 PM.

Description

Add a presentedFrame API to the transition controller.

This API allows a view controller to define what its final frame should be when it's presented. This is useful for building drawer UIs that partially cover the screen.

TODO: Setting a presentedFrame should probably also change the modal presentation style to custom or overCurrentContext.

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