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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

Validation with Key-Value Coding

As mentioned earlier, there are two opportunities for validation when working with Cocoa controls and bindings. The first, formatters, straddles the view and controller layers of MVC. Once a value is accepted by a formatter, if present, there is a second opportunity for validation via Key-Value Coding (KVC), or, more specifically, by Key-Value Validation. Key-Value Validation is done at the model and/or controller layers. That is, the model objects themselves can opt in to validating changes.

Adding Key-Value validation to RaiseMan

RaiseMan’s users can enter any name for an employee, even the empty string. But they cannot enter just anything for the raise. Although you made the number formatter ...

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Publisher Resources

ISBN: 9780134077130Purchase book