
398 9 Chapter 19: Making It Happen: Events, Responders, Delegates, and Notification
You use accessors to get information out of the event objects
and data structures. For all practical purposes, you program
using the two types of events in much the same way when it
comes to getting data from the event.
The data in the event consists of general information such as
the time at which the event occurred as well as information
identifying the specific type of event (a mouse down, for ex-
ample) and data that applies only to that specific event (such
as a location).
Timers
Timers are a special type of event: They fire repeatedly ac-
cording