比较两个NSArrays和返回的差异数 [英] Compare two NSArrays and return number of differences

问题描述

如何获取两个NSArrays，比较它们，然后返回差异数，最好是不同对象的数量，例如：

How can I take two NSArrays, compare them, then return the number of differences, preferably the number of different objects, for example:

$ b one
two
three

Array 1: one two three

数组2：
two
four
one

Array 2: two four one

我想要返回1

推荐答案

使用中间 NSMutableArray a>：

NSArray *array1 = [NSArray arrayWithObjects:@"One", @"Two", @"Three", nil];
NSArray *array2 = [NSArray arrayWithObjects:@"Two", @"Four", @"One", nil];
NSMutableArray *intermediate = [NSMutableArray arrayWithArray:array1];
[intermediate removeObjectsInArray:array2];
NSUInteger difference = [intermediate count];

这样，只有公共元素才会被删除。

With that way, only common elements will be removed.

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