Display clearColor UIViewController over UIViewController

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iOS8+

In iOS8+ you can now use the new modalPresentationStyle UIModalPresentationOverCurrentContext to present a view controller with a transparent background:

MyModalViewController *modalViewController = [[MyModalViewController alloc] init];
modalViewController.modalPresentationStyle = UIModalPresentationOverCurrentContext;           
[self presentViewController:modalViewController animated:YES completion:nil];

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