On May 8, 2008, at 6:05 PM, Western Botanicals wrote:
I am getting the following error that seems to be happening because I am enumerating through a dictionary while it is being edited. I really need these things to happen simultaneously.
I doubt you do. If you think about it, the very idea of enumeration breaks down if the dictionary is changing. Should newly added keys appear in the enumeration?
What can I do?
That depends on what you're actually trying to accomplish. One possible strategy is to use the -allKeys method to get a snapshot of the keys in the dictionary prior to the operation. Enumerate over that array and mutate the dictionary with what you find.
Heh. I wrote the above and then took a moment to look at the documentation. In the description of the -keyEnumerator method, I found this text which is so close to what I wrote that it's funny:
"If you use this method with instances of mutable subclasses of NSDictionary, your code should not modify the entries during enumeration. If you intend to modify the entries, use the allKeys method to create a “snapshot” of the dictionary’s keys. Then use this snapshot to traverse the entries, modifying them along the way."
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