UIModalTransitionStyle is used to indicate how the modal form is brought into view. For example, it can be in an upright position, flip horizontally or make a partial curl.
UIModalPresentationStyle is used to indicate whether you want the modal form to be full-screen (mainly for the iPhone) or otherwise (therefore only meaningful for the iPad) as a page sheet (full height, width is the size of the portrait mode screen width), a form sheet (partial width and partial height) or the current context (that is, what the parent container uses).
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