September 2002
Intermediate to advanced
1272 pages
31h 12m
English
Content preview from Cocoa® Programming
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Notifications
Notifications are a flexible mechanism that enables multiple objects to communicate with each other without tightly coupling the objects together. An object called a notification center is used to register objects that need to be notified under certain circumstances. The objects registered to receive notifications are called observers. When objects post notifications with the notification center, the notification center distributes the posted notifications to interested observers by sending Objective-C messages to them. The notifications design pattern is described in Chapter 6.
The observers know about the notification center, but don’t need to know anything about the objects that post notifications. The objects that post notifications ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.