获得最发生的NSString在一个数组 [英] Get most-occurring NSString in an array

问题描述

由于的NSString 组成的数组其中有几个重复的副本：

Given an array of NSStrings which have several repeated copies:

AAA
BBB
AAA
AAA
BBB
BBB
BBB
BBB
CCC

什么是获取这是大多数发生在字符串的最简单的方法？

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

推荐答案

使用<一个href=\"https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSCountedSet_Class/Reference/Reference.html\"相对=nofollow> NSCountedSet ，然后找到最大的 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;
    }
}

检查结果是：

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

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