Getting ready

Before checking how to manage memory and avoid some common mistakes, I would like to highlight some notes:

• Assigning a class instance to variable, constant, or properties will create a strong reference to this instance. The instance will be kept in memory as long as you use it.
• Setting the reference to nil will reduce its reference counting by one (once it reaches zero, it will be deallocated from memory). When your class deallocated from memory, all class instance properties will be set to nil as well.