请问这个方法的详细用法 谢谢！
-(NSArray *)sortedArrayUsingDescriptors: (NSArray *)sortDescriptors

大哥你得把问题贴出来，描述不清无法回答

1. void arraySort() {
   
2.     Student *stu1 = [[Student alloc] initWithName:@"lisi" andAge:18 andScore:87];
   
3.     Student *stu2 = [[Student alloc] initWithName:@"wangwu" andAge:19 andScore:60];
   
4.     Student *stu3 = [[Student alloc] initWithName:@"zhangsan" andAge:28 andScore:89.5];
   
5.     Student *stu4 = [[Student alloc] initWithName:@"zhaoliu" andAge:38 andScore:99];
   
6.     Student *stu5 = [[Student alloc] initWithName:@"liMing" andAge:17 andScore:79];
   
7.    
   
8.     NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3, stu4,stu5, nil];
   
9.     NSLog(@"未排序前--------------------------------------\n");
   
10.     [array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    
11.         NSLog(@"%@",obj);
    
12.     }];
    
13.    
    
14.     // 1.先按照成绩进行排序
    
15.     // 这里的key写的是get的名称
    
16.     NSSortDescriptor *scoreDesc = [NSSortDescriptor sortDescriptorWithKey:@"score" ascending:YES];
    
17.     // 2.再按照年龄进行排序
    
18.     NSSortDescriptor *ageDesc = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
    
19.     // 3.再按照姓名进行排序
    
20.     NSSortDescriptor *nameDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
    
21.     // 按顺序添加排序描述器
    
22.     NSArray *descs = [NSArray arrayWithObjects:scoreDesc, ageDesc, nameDesc, nil];
    
23.    
    
24.     NSArray *array2 = [array sortedArrayUsingDescriptors:descs];// 按升序排列
    
25.     NSLog(@"排序后--------------------------------------");
    
26.     [array2 enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
    
27.         NSLog(@"%@",obj);
    
28.     }];
    
29.    
    
30.    
    
31. }
    

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