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POAccessing ivar of an instance of the same class in a class method
 

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  1. POAccessing ivar of an instance of the same class in a class method
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    <p>Edit 2: In addition to Kurt's solution, there is one more way to do it. Take a look at the end of this page, just before comments: <a href="http://www.friday.com/bbum/2009/09/11/class-extensions-explained/" rel="nofollow">http://www.friday.com/bbum/2009/09/11/class-extensions-explained/</a></p> <hr> <p>Edit: It seems class methods in a class category cannot access private members such as ivars and private methods that are implemented through class extensions.</p> <hr> <p>I hope this question is not asked and answered before, but I could not find one as both stackoverflow and Google search spams my browser window with kinds of questions that ask to access an ivar directly from a class method, which is clearly not my intention.</p> <p>Straight to the problem, I'll provide a piece of code, which summarizes what I'm trying to accomplish:</p> <hr> <p>XYZPerson.h:</p> <pre><code>@interface XYZPerson : NSObject @property (weak, readonly) XYZPerson *spouse; @end </code></pre> <p>XYZPersonMariage.h:</p> <pre><code>@interface XYZPerson (XYZPersonMariage) +(BOOL)divorce:(XYZPerson *) oneOfSpouses; @end </code></pre> <p>XYZPersonMariage.m</p> <pre><code>+(BOOL)divorce:(XYZPerson *)oneOfSpouses { XYZPerson *otherSpouse = [oneOfSpouses spouse]; if(otherSpouse != nil) { oneOfSpouses-&gt;_spouse = nil; otherSpouse-&gt;_spouse = nil; return true; } return false; } </code></pre> <p>I first thought that maybe an ivar is not automatically synthesized for a property flagged readonly, but it is indeed synthesized.</p> <p>So, what paths can I take to get the job done?</p>
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    1. COWould simply declaring a setter outside of main .h file be acceptable? So you'd declare, say, the category XYZPerson+FriendMethods and expose a setter in that.
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    2. COI don't understand what you're trying to accomplish. Where is `aSpouse` supposed to come from? You aren't providing it, or setting it, anywhere.
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    3. CO@KurtRevis edited.
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