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Can we get the key for an object in an NSDictionary by passing a particular value or object?
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NSDictionary / NSMutableDictionary copies keys, and holds strong references to values.
An NSDictionary will retain it's objects, and copy it's keys.
You have to convert NSDictionary to NSMutableDictionary . You have to user NSMutableDictionary in place of the NSDictionary . After that you can able to change value in NSMutableDictionary .
An object representing a static collection of key-value pairs, for use instead of a Dictionary constant in cases that require reference semantics.
-[NSDictionary allKeysForObject:] returns an NSArray of all the keys whose objects match the passed object, where "match" is determined by isEqual:.
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