GUI Button assiged to a view created by Xcode?

I'm relativley new to Unity/Xcode and experimenting with the limites and capabilities of the two programs linked. Currently I'm looking at developing a Unity based Xcode project which has a GUI Button produced from Unity.

That can perform a command, that on the device will show a UIView with the Button (generated through Unity), once clicked on the button it shall take you to a different view which is generated by Xcode/Interface Builder.

I have a pro license for Unity so I'm able to build iOS projects, All help is appreciated Thanks.