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    <p>Write a category on UIView.</p> <p>In Xcode, go File -> New -> File and then select "Objective-C Category" from the Cocoa Touch row in the iOS section. Ensure the category is on UIView, give it a name and you're away.</p> <p>From here, you can add properties or even instance methods, which, assuming you import the category in your app's prefix file, all classes that inherit from UIView will have access to.</p> <p>EDIT: I have not worked with associated objects. This is a really simple example using pre-defined properties that already exist in the object, using my own properties to simplify their retrieval.</p> <p>The OP has not stated what kind of property they wish to add to UIView, which is why I made the assumption that a category would suffice. I am certain you are all correct with the comments below re: data storage on a truly custom property.</p> <p>I do not appreciate downvotes when in fact the objective of the OP has not been made quite so clear, regarding the usage of their "newProperty."</p> <p>eg: Category on UIView called Position. (UIView+Position)</p> <pre><code>UIView+Position.h @interface UIView (Position) -(CGFloat)left; -(CGFloat)right; -(CGFloat)top; -(CGFloat)bottom; @property (nonatomic) CGFloat left; @property (nonatomic) CGFloat right; @property (nonatomic) CGFloat top; @property (nonatomic) CGFloat bottom; @end UIView+Position.m #import "UIView+Position.h" @implementation UIView (Position) -(CGFloat)left { return self.frame.origin.x; } -(CGFloat)right { return self.frame.origin.x + self.frame.size.width; } -(CGFloat)top { return self.frame.origin.y; } -(CGFloat)bottom { return self.frame.origin.y + self.frame.size.height; } @end </code></pre>
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    1. POAdding property to super class UIView
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    1. USLuke
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    1. COA category can add methods to the class, but not a property. This is because a category cannot add a backing store / ivar for the getter and setter to manipulate.
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      1. USJeff Wolski
    2. COYou cannot add `iVars`. Refer : http://stackoverflow.com/q/6162589/667586 http://stackoverflow.com/a/6162619/667586
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      1. USAbhishek Bedi
    3. COthis would allow you to declare and define instance methods (including property declarations), but it does not permit storage (e.g. it is an error to synthesize a property in the implementation of a category).
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      1. USjustin
 

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Guidance
A row detail

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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