如何分割iOS 3.0和iOS 3.2的代码，以便在OS 3.2++的情况下使用MPMoviePlayerViewController

I have a video that I play. To use full screen in iOS 3.2 I use the MPMoviePlayerViewController (seems to only work with that Class). But if I want to build for iOS 3.0 I obviously get several errors, because this class is not known in iOS 3.0. I also know how to get what I want with MPMoviePlayerController in iOS 3.0, but I can only have one, either the code for iOS 3.0 or the code for iOS 3.2.I have a video that I play. To use full screen