nsdictionary数组目标c中项的关键示例

I have an array of dictionaries containing some values and keys.suppose keys k1,k2,k3,k4 etc... from this array I need to find object for key k1 for which I know the object of key k3 of the same dictionary. Is there any method without using iteration that means by using predicates or keyvalue coding(KVC)I have an array of dictionaries containing some