How to add an UIView to the front most view of the whole iOS in the tweak application?

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My app is a tweak app running in SpringBoard, in which I want to use MBProgressHUD,
but it need to specify a view to add to, so how can I get the font most view of the whole iOS?

I can get the SBApplication instance of the frontmost application,
but I need use the instance of UIApplication,
just as the result of [UIApplication sharedInstance],
but how can I get the UIApplication instance from SBApplication?

Thank you!