在数组中查找最重复的对象

本文介绍了在数组中查找最重复的对象的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我有一个充满字符串的数组，每个字符串都是一个名字。有些名称可能相同，有些名称可能不同。我正在使用的语言是Objective-C。我希望能够从这个数组中找出最受欢迎的名称（该数组将根据用户提供给应用程序的信息而动态显示）。我不确定如何有效地实现这一目标。如果有人可以扩展或提供一个例子，我们将不胜感激。

I have an array full of strings with each string being a name. Some names may be the same while some may be different. The language I'm working in is objective-C. I want to be able to find out which name is most popular from this array (the array will be dynamic based on information given to the app from the user). I am not sure how to make this happen EFFICIENTLY. If someone could expand on this or provide an example, it would be appreciated.

谢谢

示例：

NSArray *nameArray= [[NSArray alloc] initWithObjects @"james", @"megan", @"lauren", @"mike" @james", nil]; //james would be the most popular name

推荐答案

使用 NSCountedSet ，然后使用 countForObject：方法找到计数最高的对象。

Use NSCountedSet and then find the object with highest count using countForObject: method.

//create count set from array NSCountedSet *setOfObjects = [[NSCountedSet alloc] initWithArray:yourArrayhere]; //Declaration of objects NSString *mostOccurringObject = @""; NSUInteger highestCount = 0; //Iterate in set to find highest count for a object for (NSString *strObject in setOfObjects) { NSUInteger tempCount = [setOfObjects countForObject:strObject]; if (tempCount > highest) { highestCount = tempCount; mostOccurringObject = strObject; } }

检查结果：

NSLog(@"Most frequent string: %@ with count: %i", mostOccurringObject,highestCount);

信用转到 @ Evan Mulawski 回答