How to present a modal view controller on the iphone without a "current" view controller?

I'm trying to open the email view controller (MFMailComposeViewController), and everything I read suggests using presentModalViewController:animated:, which seems to need to be sent to a UIViewController.

For example, in the documentation, it says:

Call the presentModalViewController:animated:开发者_高级运维 method of the current view controller, passing in the view controller you want to present modally.

But I don't have a "current view controller"! My app is otherwise entirely OpenGL, and my setup code looks like:

self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.view = [[IPhoneView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

[window addSubview: self.view];
[window makeKeyAndVisible];

and I set up the OpenGL context in the IPhoneView class.

I've found a number of questions asking how to get a UIViewController from a UIView, and the consensus seems to be: don't. So how can I open the email view controller with that nifty sliding animation?

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You can always do your own sliding animation of a view and just pass MFMailComposeViewController to it: Hidden Drawer example

See a similar sliding code here as well: How can I present a UIView from the bottom of the screen like a UIActionSheet?