September 2002
Intermediate to advanced
1272 pages
31h 12m
English
Content preview from Cocoa® Programming
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Delegates
Delegates and delegate methods are used throughout the Application Kit. Delegates provide an alternative to subclassing when the behavior of classes must be refined to meet an application’s needs. Application Kit classes such as NSApplication, NSWindow, NSBrowser, and NSMatrix are seldom subclassed. Delegation enables all the customization that most applications need.
A delegate is an object that is able to influence the behavior of another object by responding to delegate messages. A class that uses a delegate has a delegate instance variable and defines a number of delegate methods. An instance of that class sends delegate messages to its delegate for help deciding how to behave. For example, the NSWindow class has a delegate and ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.