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    <p>You can't use <code>@synthesize</code> with a category.</p> <p>You <em>can</em> do this with an class extension (a.k.a. anonymous category), which is just a category without a name whose methods must be implemented in the main <code>@implementation</code> block for that class. For your code, just change "(Private)" to "()" and use <code>@synthesize</code> in the main <code>@implementation</code> block along with the rest of your code for that class.</p> <p>See <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocCategories.html" rel="noreferrer">the Apple docs on extensions</a> for more about that. (Apparently this is new in Mac OS 10.5.)</p> <p>EDIT: An example:</p> <pre><code>// Main interface (in .h) @interface Foo : NSObject - (void)bar; @end // Private interface (in .m, or private .h) @interface Foo () @property (nonatomic, copy) NSString *myData; @end @implementation Foo @synthesize myData; // only needed for Xcode 4.3 and earlier - (void)bar { ... } @end </code></pre> <p>Another solution, which is much more work, is to use <code>objc_setAssociatedObject</code> and <code>objc_getAssociatedObject</code> to fake additional instance variables. In this case, you could declare these as properties, and implement the setters and getters yourself using the objc_* runtime methods above. For more detail on those functions, see <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ObjCRuntimeRef/Reference/reference.html" rel="noreferrer">the Apple docs on Objective-C runtime</a>.</p>
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    1. POHiding properties from public access
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    1. USJesse Rusak
    1. USJesse Rusak
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    1. CO+1 for the extension way. I also wrote a quick comparison of the different types of category in this answer http://stackoverflow.com/questions/360968/category-usage-in-objective-c/361140#361140
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      1. USAbizern
    2. CO@Abizern - nice reference. You could also link that answer to this question for more info about properties.
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      1. USJesse Rusak
    3. COWorth noting: apparently the URL for the docs on extensions has changed to: http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/ObjectiveC/Introduction/introObjectiveC.html
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      1. USDavid Cairns
 

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