Skip to Main Content
Cocoa Programming for OS X: The Big Nerd Ranch Guide
book

Cocoa Programming for OS X: The Big Nerd Ranch Guide

by Aaron Hillegass, Adam Preble, Nate Chandler
April 2015
Intermediate to advanced content levelIntermediate to advanced
556 pages
17h 47m
English
Big Nerd Ranch Guides
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide

Completion Handlers and Closures

Imagine that your career as a Cocoa programmer has been so successful that you have hired a chauffeur. You tell your chauffeur, “I’d like to go to the Apple Store. Would you bring the car around? Send me an iMessage when you’re at the portico.” The chauffeur nods solemnly and disappears. The completion handler is firmly set: “After I’ve pulled the car around to the portico, send an iMessage.”

Completion handlers are a powerful mechanism for executing arbitrary code at the completion of a long-running operation. Back in the context of alerts, the long-running operation is waiting for the user’s button click. Other examples include network communication (Chapter 28) and calculations made on a background ...

Become 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,
and much more.
Start your free trial

You might also like

Cocoa and Objective-C: Up and Running

Cocoa and Objective-C: Up and Running

Scott Stevenson
Learning Cocoa with Objective-C, 4th Edition

Learning Cocoa with Objective-C, 4th Edition

Paris Buttfield-Addison, Jonathon Manning, Tim Nugent

Publisher Resources

ISBN: 9780134077130Purchase book