is ready to be destroyed (as determined by the reference counting
mechanism), the system will give the object an opportunity to clean
up after itself by calling the
method defined by
NSObject. If the object has created or retained
any other objects’ reference by its instance
variables, it must implement this method and perform the appropriate
tasks to maintain integrity of the reference counting system.
In Example 1-8, the
title instance variable in the
setTitle: method. To properly implement memory
management, you need to balance this retain with a release. Example 1-10 shows the release performed in the
This provides proper balance in the reference counting mechanism.