Apple provides the Core Motion framework to expose precise information on the iOS device's orientation in physical space. We can use this data to move our player on the screen when the user tilts their device in the direction they want to move. This unique style of input offers new game-play mechanics in mobile games.
Note
You will need a physical iOS device for this Core Motion section. The iOS simulator in Xcode does not simulate device movement. However, this section is only a learning exercise and is not required to finish the game we are building. Our final game will not use Core Motion. Feel free to skip the Core Motion section if you cannot test with a physical device.