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POmain in my NSOperation subclass not being called
 

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    <p>I subclassed NSOperation and implemented the main method. When I added it to an NSOperationQueue, it was not being called. I compared it to sample code and sample projects that <em>do</em> work and could not see what the problem was. Does anyone have any experience with this problem and what causes it, please?</p> <p>After going crazy trying to find the problem, I decided to start over from scratch, rebuild my class and test it at each step. In the header, I declared it a subclass of NSOperation. In the implementation file, I implemented main and only put a couple of lines: <code>sleep(3)</code>; <code>NSLog..;</code>. All good. Each step worked as I started to add properties, even declared delegate, etc.</p> <p>Finally, in the main, I put code to use NSDirectoryEnumerator. Suddenly, main was not being called at all. Not only that, when I took that code back out, it still does not work!! I tried restarting XCode 4, restarting my machine (not that I know why these might help, but I'm running out of ideas) but all to no avail.</p> <p>Any clues at all would be most appreciated. Thanks.</p> <hr> <p>Update: I started over (again!) from scratch but this time I assembled the parts in a different order... and now it works! However, in case there is something that I'm doing wrong anyway and I've just been lucky this time round, here is the @interface section as @Andrew suggested:</p> <pre><code>@class ScanOperation; @protocol ScanOperationDelegate -(void)fileFound:(ScanOperation *)operation; -(void)finishedScanOperation:(ScanOperation *)operation; @end #import &lt;Foundation/Foundation.h&gt; @interface ScanOperation : NSOperation { @private NSObject &lt;ScanOperationDelegate&gt; *delegate; NSURL *rootUrl; int totCount, dirCount, filCount, errCount; NSTimeInterval elapsed; } - (id)initWithScanRootUrl:(NSURL *)startAtUrl; @property (readwrite, assign) NSObject &lt;ScanOperationDelegate&gt; *delegate; @property (readonly) int totCount, dirCount, filCount, errCount; @property (readonly) NSTimeInterval elapsed; @end </code></pre>
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    1. COit would help to see the @interface section to make sure that you subclassed it properly
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    2. COI built it back up from scratch but this time in a different order and it works... however, I'll paste in the @interface anyway in case someone notices something that's not right:
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    3. COIs your `NSOperation` subclass concurrent? `-main` is automatically invoked only if the operation is **not** concurrent.
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