使用自定义类属性的两个NSMutableSets的平等 [英] Equality of Two NSMutableSets Using Custom Class Attributes

问题描述

如何检查两个 NSMutableSets 是否相等（相同成员，成员数量）

我的实现 isEqualToSet 似乎无效。

// members is a NSMutableSet of AUser objects

// users is also a NSMutableSet of AUser objects, it is an attribute of instances of the AGroup class

[[group valueForKey:@"users"] isEqualToSet:members]


AGroup
- users

AUser
- name  (String)

如何检查集合是否相等名称属性？

How do I check if the sets are equal by checking their name attributes?

对不起，由于我缺乏知识，这是我第一次使用iOS编程，所以我只知道当前的基本知识。

Sorry for my lack of knowledge, it's my first time with iOS programming, so I only know the basics at the moment.

推荐答案

如果你想检查相应的 name 属性是否相同， / p>

If you want to check if the corresponding name attributes are identical, the following should work:

[[group valueForKeyPath:@"users.name"] isEqualToSet:[members valueForKey:@"name"]]

[group valueForKeyPath：@users.name] 返回组中所有用户的名称集， [members valueForKey：@name] 返回<$ c中所有用户的名称集$ c>会员。

[group valueForKeyPath:@"users.name"] returns the set of the names of all users in the group, and [members valueForKey:@"name"] returns the set of the names of all users in the members set.

更新： > members 是一组字符串，而不是一组用户对象。因此代码简化为：

Update: As it became clear in the comments, members is a set of strings, and not a set of user objects. Therefore the code simplifies to:

[[group valueForKeyPath:@"users.name"] isEqualToSet:members]

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