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copied!<p><strong>IMPORTANT</strong>: The question (and my code below) both deal with a very specific case, in which the NSMutableDictionary contains <em>only</em> arrays of strings. These solutions <em>will not work</em> for more complex examples. For more general case solutions, see the following:</p> <ul> <li><a href="https://stackoverflow.com/a/1950462/33686">Tom Dalling's answer</a></li> <li><a href="https://stackoverflow.com/a/1950456/33686">dreamlax's answer</a></li> <li><a href="https://gist.github.com/yfujiki/1664847" rel="nofollow noreferrer">Source from yfujiki on GitHub Gist</a></li> </ul> <hr> <p><strong>Answer for this specific case:</strong></p> <p>Your code should work, but you will definitely need the <code>[oneCopy release]</code>. The new dictionary will retain the copied objects when you add them with <code>setValue:forKey</code>, so if you do not call <code>[oneCopy release]</code>, all of those objects will be retained twice.</p> <p>A good rule of thumb: if you <code>alloc</code>, <code>retain</code> or <code>copy</code> something, you must also <code>release</code> it.</p> <p>Note: here is some sample code that would work <em>for certain cases only</em>. This works because your NSMutableDictionary contains only arrays of strings (no further deep copying required):</p> <pre><code>- (NSMutableDictionary *)mutableDeepCopy { NSMutableDictionary * ret = [[NSMutableDictionary alloc] initWithCapacity:[self count]]; NSMutableArray * array; for (id key in [self allKeys]) { array = [(NSArray *)[self objectForKey:key] mutableCopy]; [ret setValue:array forKey:key]; [array release]; } return ret; } </code></pre>

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