たとえばNエントリの辞書を作成する場合は、コードを使用して作成できます。
int N = 100; // or what ever number you want
NSArray *arrayOfObjectsYouWantToPumpIntoDictionary = ....;
NSMutableDictionary *mutableDictionary = [NSMutableDictionary dictionaryWithCapacity:100];
for(int i=0;i<N;i++){
NSString *key = [NSString stringWithFormat:@"%d"i];
[mutableDictionary setObject:[arrayOfObjectsYouWantToPumpIntoDictionary objectAtIndex:i] forKey:];
}
// Later some where else if you want to retrieve object with key of x (x can be 1, or 2 or what ever value), you can do
objectToBeRetrieved = [mutableDictionary objectForKey:[NSString stringWithFormat:@"%d",x];