When the UIAlertView appear,what view changes made to the viewcontroller

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I want to know how the UIAlertController work. I am trying to develop loading a view which will do the same like UIActivityIndicatorView. When my loading view is appearing on the screen, I want to do the same thing like UIAlertController which code made the whole screen black and user interaction disabled to that view until the user click "OK". Any help please?

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