The problem was the ViewController Type and how he gets presented. If the ViewController gets presented Modally, you need to change "parent" with "self.presentingViewController".

Update: The Buttons are on the other ViewController always accessible but only appear (get visible) when you push them or touch after starting the App a different ViewController and then go back

Update: The Buttons are on the other ViewController always accessible but only appear (get visible) when you push them or touch after starting the App a different ViewController and then go back Thanks for Help

I just needed to change the Background Color of the Buttons on the other ViewControllers. Why is the FILLED Button loading directly with background color on the first ViewController but on the other not?

unfortunately not;(