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    <p>A couple of years ago, I wrote a few category methods for exactly the same reason, transforming a whole tree of user defaults to mutable. Here they are - use them at your own risk! :-)</p> <pre><code>// // SPDeepCopy.h // // Created by Sherm Pendley on 3/15/09. // #import &lt;Cocoa/Cocoa.h&gt; // Deep -copy and -mutableCopy methods for NSArray and NSDictionary @interface NSArray (SPDeepCopy) - (NSArray*) deepCopy; - (NSMutableArray*) mutableDeepCopy; @end @interface NSDictionary (SPDeepCopy) - (NSDictionary*) deepCopy; - (NSMutableDictionary*) mutableDeepCopy; @end </code></pre> <hr> <pre><code>// // SPDeepCopy.m // // Created by Sherm Pendley on 3/15/09. // #import "SPDeepCopy.h" @implementation NSArray (SPDeepCopy) - (NSArray*) deepCopy { unsigned int count = [self count]; id cArray[count]; for (unsigned int i = 0; i &lt; count; ++i) { id obj = [self objectAtIndex:i]; if ([obj respondsToSelector:@selector(deepCopy)]) cArray[i] = [obj deepCopy]; else cArray[i] = [obj copy]; } NSArray *ret = [[NSArray arrayWithObjects:cArray count:count] retain]; // The newly-created array retained these, so now we need to balance the above copies for (unsigned int i = 0; i &lt; count; ++i) [cArray[i] release]; return ret; } - (NSMutableArray*) mutableDeepCopy { unsigned int count = [self count]; id cArray[count]; for (unsigned int i = 0; i &lt; count; ++i) { id obj = [self objectAtIndex:i]; // Try to do a deep mutable copy, if this object supports it if ([obj respondsToSelector:@selector(mutableDeepCopy)]) cArray[i] = [obj mutableDeepCopy]; // Then try a shallow mutable copy, if the object supports that else if ([obj respondsToSelector:@selector(mutableCopyWithZone:)]) cArray[i] = [obj mutableCopy]; // Next try to do a deep copy else if ([obj respondsToSelector:@selector(deepCopy)]) cArray[i] = [obj deepCopy]; // If all else fails, fall back to an ordinary copy else cArray[i] = [obj copy]; } NSMutableArray *ret = [[NSMutableArray arrayWithObjects:cArray count:count] retain]; // The newly-created array retained these, so now we need to balance the above copies for (unsigned int i = 0; i &lt; count; ++i) [cArray[i] release]; return ret; } @end @implementation NSDictionary (SPDeepCopy) - (NSDictionary*) deepCopy { unsigned int count = [self count]; id cObjects[count]; id cKeys[count]; NSEnumerator *e = [self keyEnumerator]; unsigned int i = 0; id thisKey; while ((thisKey = [e nextObject]) != nil) { id obj = [self objectForKey:thisKey]; if ([obj respondsToSelector:@selector(deepCopy)]) cObjects[i] = [obj deepCopy]; else cObjects[i] = [obj copy]; if ([thisKey respondsToSelector:@selector(deepCopy)]) cKeys[i] = [thisKey deepCopy]; else cKeys[i] = [thisKey copy]; ++i; } NSDictionary *ret = [[NSDictionary dictionaryWithObjects:cObjects forKeys:cKeys count:count] retain]; // The newly-created dictionary retained these, so now we need to balance the above copies for (unsigned int i = 0; i &lt; count; ++i) { [cObjects[i] release]; [cKeys[i] release]; } return ret; } - (NSMutableDictionary*) mutableDeepCopy { unsigned int count = [self count]; id cObjects[count]; id cKeys[count]; NSEnumerator *e = [self keyEnumerator]; unsigned int i = 0; id thisKey; while ((thisKey = [e nextObject]) != nil) { id obj = [self objectForKey:thisKey]; // Try to do a deep mutable copy, if this object supports it if ([obj respondsToSelector:@selector(mutableDeepCopy)]) cObjects[i] = [obj mutableDeepCopy]; // Then try a shallow mutable copy, if the object supports that else if ([obj respondsToSelector:@selector(mutableCopyWithZone:)]) cObjects[i] = [obj mutableCopy]; // Next try to do a deep copy else if ([obj respondsToSelector:@selector(deepCopy)]) cObjects[i] = [obj deepCopy]; // If all else fails, fall back to an ordinary copy else cObjects[i] = [obj copy]; // I don't think mutable keys make much sense, so just do an ordinary copy if ([thisKey respondsToSelector:@selector(deepCopy)]) cKeys[i] = [thisKey deepCopy]; else cKeys[i] = [thisKey copy]; ++i; } NSMutableDictionary *ret = [[NSMutableDictionary dictionaryWithObjects:cObjects forKeys:cKeys count:count] retain]; // The newly-created dictionary retained these, so now we need to balance the above copies for (unsigned int i = 0; i &lt; count; ++i) { [cObjects[i] release]; [cKeys[i] release]; } return ret; } @end </code></pre>
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    1. POhow to do true deep copy for NSArray and NSDictionary with have nested arrays/dictionary?
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    1. USSherm Pendley
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    1. COexcellent Sherm thanks - so there's nothing that Apple has that does this for you obviously I guess then? one would wonder if this was the case whether there might be some popular open source library that captures such a useful method?
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    2. CONo, Apple doesn't supply anything like that. There may be an FOSS library that includes it, but to be honest I didn't look very hard, since this took all of an hour to write anyway.
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    3. COThanks for this. Works great!
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