Improvements in iOS Keyboard app

I am building keyboard app for iPad users on objective-c. App is almost done, but still few improvements needs to made which unfortunately I can't figure out myself. Here is the things which needs to be done: 1. My keyboard have a settings where user can rotate keyboard for a limited degrees and drag keyboard for the place on the screen user needs. Problem which needs to be solved is that as of now during the rotation or dragging I can move buttons out of screen bounds which is not acceptable. So it needs to be solved so that buttons can't be moved out of screen bounds. 2. RAM consumption needs to be reduced at least a little bit. Because there is a limit and Apple might not allow the app on the app store because of this.