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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/1999/REC-html401-19991224/loose.dtd">
<html>
<head>
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<link rel="home" href="http://developer.apple.com/">
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<title>TwoManyControllers - /ReadMe.txt</title>
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<td align="left" colspan="2">
<a href="http://developer.apple.com/">ADC Home</a> > <a href="../../referencelibrary/index.html">Reference Library</a> > <a href="../../samplecode/index.html">Sample Code</a> > <a href="../../samplecode/Cocoa/index.html">Cocoa</a> > <a href="../../samplecode/Cocoa/idxDataManagement-date.html">Data Management</a> > <A HREF="javascript:location.replace('index.html');">TwoManyControllers</A> >
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<td><h1><div id="pagehead">TwoManyControllers</div></h1></td>
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<h2>/ReadMe.txt</h2>
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<p><strong>View Source Code:</strong>
<select name="gotop" onChange="JumpToNewPage();" style="width:340px"><option selected value="ingnore">Select File</option>
<option value="listing1.html">/main.m</option>
<option value="listing2.html">/MyDocument.h</option>
<option value="listing3.html">/MyDocument.m</option>
<option value="listing4.html">/ReadMe.txt</option></select>
</p>
</form>
<p><strong><a href="TwoManyControllers.zip">Download Sample</a></strong> (“TwoManyControllers.zip”, 202.9K)<BR>
<strong><a href="TwoManyControllers.dmg">Download Sample</a></strong> (“TwoManyControllers.dmg”, 266.1K)</p>
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<p><strong><a href="#">Download Sample</a></strong> (“filename.sit”, 500K)</p>
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<!--googleon: index -->
<pre class="sourcecodebox">TwoManyControllers, v1.0
Abstract:
This sample demonstrates how NSArrayControllers can be used to produce a user
interface that traverses multiple (in this case two) to-many relationships.
The basic model consists of a Product with a to-many relationship to a Version
which in turn has a to-many relationship to a License. That is, a product has
many versions, and a version has many licenses.
In this example, we would like the user to be able to select a single Product
and display all the Licenses associated with that Product. To accomplish this
we use an intermediate NSArrayController that holds an array of all the
Versions associated with the selected Product. We then populate the Licenses
NSArrayController with the distinct set of objects returned from asking every
Version object in the Versions Array Controller (the arrangedObjects) for its
Licenses key path.
Usage:
The top half of the interface is intended to allow you to add projects,
versions, and licenses at will. You will need to add some sample data in order
to fully appreciate the purpose of this sample.
The bottom portion of the UI is meant to illustrate the ability to select a
product and view all of its licenses. This is accomplished entirely using
NSArrayControllers and bindings.
Model Details:
Please refer to MyDocument.xcdatamodel within the project.
Bindings Details:
Please refer to BindingsDiagram.pdf for a high level view of the bindings used
in this sample. The diagram should act as a good starting point in determining
which bindings to inspect in Interface Builder. The diagram aims to be less of
an exhaustive reference for the details about each binding and more of a
high-level guide to how the controllers and the UI in the sample interact.</pre>
<!--googleoff: index -->
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