Sneak in UIView

Does anyone know how to sneak a UIView into a Unity game through XCode and use it to launch scenes?

This is possible, but it isn't an easy task. You can achieve that with use of native plugin (Unity iPhone Advanced feature):

  1. Expose your native C/C++ function as native plugin. (Check this example : http://unity3d.com/support/resources/files/NativeCodeExample.zip)
  2. Inside this native function pause unity player (call UnityPause(true)).
  3. Create and display UIView.
  4. Gather user input results from UIView, dispose UIView.
  5. Unpause unity player (call UnityPause(false)).
  6. Send gathered user input to the scripts (call UnitySendMessage(...)).