如何对这个 NSMutableArray 进行排序？

发布于 2024-09-26 08:58:24 字数 289 浏览 3 评论 0原文

我创建了一个名为 Person 的类。看起来像这样

Person
-------
Name
Points

然后我创建了一个名为 team 的 NSMutableArray。它包含几个这样的 person 对象。我创建了几个团队。

然后我创建了另一个名为 allTeams 的 NSMutableArray。它拥有所有的团队阵列。

我想按每个团队的总得分对 allTeams 数组进行排序，该总得分是通过对团队中每个人的得分求和得出的。

我该怎么做？

原文

I made a class called Person. It looks like this

Person
-------
Name
Points

Then I created an NSMutableArray called team. It contains several of these person objects. I create several teams.

Then I created another NSMutableArray called allTeams. It holds all the team arrays.

I want to sort the allTeams array by the total number of points for each team, found by summing the points for each person in the team.

How can I do this?

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余厌 2024-10-03 08:58:24

没有必要搞乱无关的ivars，除非你有数百万玩家和数十万支球队，否则简单的实施将比你可能需要的更快。

@interface Team : NSObject {
    NSMutableArray *people;
}

@property (readonly) NSInteger score;

@end

@implimentation Team

- (NSInteger)score {

    NSInteger score = 0;

    for(Person *person in people) {
        score = score + person.points;
    }

    return score;
}

@end

// To sort an array of teams, do the following
// assumes that `teams` is a mutable array containing all teams

NSSortDescriptor *scoreSort = [[NSSortDescriptor alloc] initWithKey:@"score" ascending:NO];
[teams sortUsingDescriptors:[NSArray arrayWithObject:scoreSort]];
[scoreSort release];

免责声明：我在没有访问我的 Mac 的情况下编写了上述代码，因此它可能无法按编写的方式编译，但它已经接近了。祝你好运！

No need to muck around with extraneous ivars, unless you have millions of players and hundreds of thousands of teams, the naive implementation will be faster than you could possibly need.

@interface Team : NSObject {
    NSMutableArray *people;
}

@property (readonly) NSInteger score;

@end

@implimentation Team

- (NSInteger)score {

    NSInteger score = 0;

    for(Person *person in people) {
        score = score + person.points;
    }

    return score;
}

@end

// To sort an array of teams, do the following
// assumes that `teams` is a mutable array containing all teams

NSSortDescriptor *scoreSort = [[NSSortDescriptor alloc] initWithKey:@"score" ascending:NO];
[teams sortUsingDescriptors:[NSArray arrayWithObject:scoreSort]];
[scoreSort release];

Disclaimer: I wrote the above code without access to my Mac, so it may not compile as written, but it's close. Good luck!

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