Get most-occurring NSString in an array

问题

Given an array of NSStrings which have several repeated copies:

AAA
BBB
AAA
AAA
BBB
BBB
BBB
BBB
CCC

What's the easiest way to get the string which is most occurring?

回答1:

Use NSCountedSet and then find the largest countForObject:.

NSCountedSet *bag = [[NSCountedSet alloc] initWithArray:myArray];

NSString *mostOccurring;
NSUInteger highest = 0;
for (NSString *s in bag)
{
    if ([bag countForObject:s] > highest)
    {
        highest = [bag countForObject:s];
        mostOccurring = s;
    }
}

Checking the result:

NSLog(@"Most frequent string: %@", mostOccurring);

来源：https://stackoverflow.com/questions/11140989/get-most-occurring-nsstring-in-an-array