如何更改此代码以便对 NSMutableArray 进行排序？

Question

我创建了一个自定义类。这是h文件

@interface Player : NSObject {
    NSString *name;
    NSNumber *points;
}

@property (nonatomic, retain) NSString *name;
@property (nonatomic, retain) NSNumber *points;

-(id) initWithName:(NSString *)n andPoints:(int)p;

@end

这是m文件

#import "Player.h"

@implementation Player
@synthesize name, points;

-(id) initWithName:(NSString *)n andPoints:(int)p
{
    self.name = n;
    self.points = [NSNumber numberWithInt:p];
    return self;
}
@end

然后我创建了几个玩家，并将他们分配到两个团队之一，如下所示：

Player *p1 = [[Player alloc] initWithName:@"Joe" andPoints:5];
Player *p2 = [[Player alloc] initWithName:@"James" andPoints:5];
Player *p3 = [[Player alloc] initWithName:@"Jim" andPoints:5];

NSMutableArray *team1 = [[NSMutableArray alloc] initWithObjects:p1,p2,p3,nil];

Player *p4 = [[Player alloc] initWithName:@"Aaron" andPoints:7];
Player *p5 = [[Player alloc] initWithName:@"Anthony" andPoints:7];
Player *p6 = [[Player alloc] initWithName:@"Alex" andPoints:7];

NSMutableArray *team2 = [[NSMutableArray alloc] initWithObjects:p4,p5,p6,nil];

然后我将这两个团队放在另一个 NSMutableArray 中，如下所示：

NSMutableArray *allTeams = [[NSMutableArray alloc] initWithObjects:team1, team2, nil];

为了显示所有玩家和他们的分数，我使用了这个循环：

for (NSMutableArray *teamArray in allTeams) {
    for (Player *player in teamArray) {
        NSLog(@"%@: %@", [player name], [player points]);
    }
}

事实上，它只会按照上面添加的顺序显示玩家。

我想按球队的分数对这组球队进行排序，这只是球队中每个球员的分数的总和。那么当循环运行显示所有球员时，team2中的球员将显示在team1之前。

按团队积分对 allTeams 数组进行排序的代码是什么？我需要使用类别吗？

Answer 1

实际上非常简单。做：

[allTeams sortUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"@sum.points" ascending:NO]]];

希望结果正确。在 iPhone 上输入代码很痛苦……