June 2011
Intermediate to advanced
590 pages
19h 31m
English
Content preview from iOS Programming: The Big Nerd Ranch Guide, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Delegation
When you set the delegate property of the CLLocationManager and implemented the two methods in WhereamiAppDelegate, you were using a design pattern called delegation. This is a very common pattern in Cocoa Touch, and many classes have a delegate property.
Delegation is an object-oriented approach to callbacks. A callback is a function that is supplied in advance of an event and is called every time the event occurs. Some objects need to make a callback for more than one event. For instance, the location manager wants to “callback” when it finds a new location and when it encounters an error.
However, there is no built-in way for two (or more) callback functions to coordinate and share information. This is the problem addressed by ...
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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.