Grab random entry in NSDictionary

Question

Is there a way to grab a totally random key in the NSDictionary?

NSString *key = [enumeratorForKeysInDictionary nextObject]; 

I have this code which iterates over the dictionary in a non-random way.

Should I add all the keys to an NSSet and then pull randomly from there?

Is there a more efficient way to do this?

Answer 1

See this:

NSArray *array = [dictionary allKeys];
int random = arc4random()%[array count];
NSString *key = [array objectAtIndex:random];

Answer 2

NSArray* allKeys = [dictionary allKeys];
id randomKey = allKeys[arc4random_uniform([allKeys count])];
id randomObject = dictionary[randomKey];