Stopping Unity inside a native iOS Application

Hello guys, I've correctly included a Unity Project for AR/VR inside my iOS application. Now on a UIViewController I can spawn Unity With "UnityGetGLView()". The problem is that if i go back from this controller and return inside It, the UnityGetGLView() return the same view of the previous call, and not a new one. So basically i need to understand how to close Unity when I close the controller where I use It.