iOS Programming: The Big Nerd Ranch Guide

UIDevice Notifications

One object that regularly posts notifications is UIDevice. Here are the constants that serve as names of the notifications that a UIDevice posts:

U​I​D​e​v​i​c​e​O​r​i​e​n​t​a​t​i​o​n​D​i​d​C​h​a​n​g​e​N​o​t​i​f​i​c​a​t​i​o​n​
U​I​D​e​v​i​c​e​B​a​t​t​e​r​y​S​t​a​t​e​D​i​d​C​h​a​n​g​e​N​o​t​i​f​i​c​a​t​i​o​n​
U​I​D​e​v​i​c​e​B​a​t​t​e​r​y​L​e​v​e​l​D​i​d​C​h​a​n​g​e​N​o​t​i​f​i​c​a​t​i​o​n​
U​I​D​e​v​i​c​e​P​r​o​x​i​m​i​t​y​S​t​a​t​e​D​i​d​C​h​a​n​g​e​N​o​t​i​f​i​c​a​t​i​o​n​

Wouldn’t it be cool to get a message when the device rotates? Or when the phone is placed next to the user’s face? These notifications do just that.

Create a new Empty Application project and name it HeavyRotation. Enter Rotation into the Class Prefix ...