How to use presentModalViewController to create a transparent view

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After iOS 3.2 there is a method to do this without any “tricks” – see the documentation for the modalPresentationStyle property. You have a rootViewController which will present the viewController.
So here’s the code to success:

viewController.view.backgroundColor = [UIColor clearColor];
rootViewController.modalPresentationStyle = UIModalPresentationCurrentContext;
[rootViewController presentModalViewController:viewController animated:YES];

With this method the viewController’s background will be transparent and the underlying rootViewController will be visible. Please note that this only seems to work on the iPad, see comments below.

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