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    <p>See Apple's documentation: <a href="https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocCategories.html" rel="nofollow">https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocCategories.html</a></p> <p>It's a class extension, subtly different from a category, since it has no name inside the parentheses. You use it for declaring properties and methods that are intended to be kept private (out of the header), and redeclaring publicly read-only properties and methods as privately read-write. This allows for cleaner encapsulation.</p> <p>By request, a friendly example:</p> <p>JYDuckPondManager.h</p> <pre><code>@interface JYDuckPondManager : NSObject @property (nonatomic, assign, readonly) NSUInteger duckCount; @property (nonatomic, assign, readonly) CGFloat waterLevel; - (JYDuckReaction *)feedDucks:(JYDuckFood *)food; - (JYDuckReaction *)harassDucks:(JYDuckTaunt *)taunt; @end </code></pre> <p>JYDuckPondManager.m (extension, imaginary implementation omitted)</p> <pre><code>@interface JYDuckPondManager () //// Redefined for internal modification @property (nonatomic, assign, readwrite) NSUInteger duckCount; @property (nonatomic, assign, readwrite) CGFloat waterLevel; //// Internally exclusive properties @property (nonatomic, strong) NSSet *duckPersonalitySet; @property (nonatomic, assign) CGFloat flockAnxietyLevel; //// Private messages - (void)recalculatePondState; @end </code></pre> <p>Other objects should be able to interact with the pond, but they're not supposed to know certain things going on in the pond or redefine the pond's statistics. Keeping nuts-and-bolts stuff in the .m extension ensures that the .h is concise and appropriately limited.</p>
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    1. COwhat's a typical use-case for the need of this functionality?
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    2. COEdited in an example. :)
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    3. CO+1 for using ducks ;-)
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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