Giving you a sample code, i think, is a bad idea. Since any game/app you're going to make has it's own unique challenges, so instead of copy/paste a code, try to learn how it works so you won't have these problems again in the future.
What @eddie tried to say is that anything you display onscreen is based on coordinates, so to move something on the screen you should modify those coordinates-CONT-
1そうだね プレイ済み