April 2015
Intermediate to advanced
556 pages
17h 47m
English
book
Cocoa Programming for OS X: The Big Nerd Ranch Guide
by Aaron Hillegass, Adam Preble, Nate Chandler
Content preview from Cocoa Programming for OS X: The Big Nerd Ranch Guide
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10 Formatters and Validation
Users are complicated. They have strong opinions about how they want to input and see data. As a developer, you want to support their whims, to get that I thought it might do this and it does! reaction. With formatters your text fields can present and accept data textually without cluttering your controller. Formatters also provide validation at the controller layer, while Key-Value Validation allows you to validate at the model layer.
Formatters
Formatters convert strings into data and data into strings. In the same way that an array controller is a lens for an array, changing the model of your application into a representation for the view layer, a formatter is a lens for one piece of data ...
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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.