On Jul 2, 2009, at 12:05 PM, Joe Turner wrote:
I'm trying to create a private copy of an object, but yet when the original changes, my copy changes too. I have an array of dictionaries called spacesData. Then, when I do: NSDictionary *backup = [[spacesData objectAtIndex:index] copy]; everything is fine, and this one looks as it should. Then, when I change something in spacesData objectAtIndex:index], this private copy changes too. Doesn't "copy" create a private copy, or am I doing something wrong?
Copying a collection makes a shallow copy, so only the collection itself is copied, not the values that it contains. If you want to copy values, check out -[NSDictionary initWithDictionary:copyItems:], or CFPropertyListCreateDeepCopy().
-- Adam
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