How to modify only one Key-Value pair in an NSMutableDictionnary

If I have an NSMutableDictionnary with 4 Key Value pairs (stored in a .plist), When I load the dictionary from the .plist how can I开发者_开发知识库 modify only one of the Key Value Pairs without erasing the rest?

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You can change a single value for the given key like so:

[dict setValue:@"value" forKey:@"key"];

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[dictionary setObject:value forKey:key] will assign the value for the specified key; [dictionary removeObjectForKey:key] will remove the key-value pair completely.