[示例-NSArray排序]-根据班级、姓名和年龄排序学生信息

main:

 1 #import <Foundation/Foundation.h>
 2 #import "Person.h"
 3
 4 int main(int argc, const char * argv[]) {
 5     @autoreleasepool {
 6         Person *stu1=[[Person alloc]initClasses:@"iOS8" andName:@"ZXY" andAge:21];
 7         Person *stu2=[[Person alloc]initClasses:@"iOS6" andName:@"HYU" andAge:28];
 8         Person *stu3=[[Person alloc]initClasses:@"iOS8" andName:@"AWE" andAge:25];
 9         Person *stu4=[[Person alloc]initClasses:@"iOS6" andName:@"MKI" andAge:23];
10         Person *stu5=[[Person alloc]initClasses:@"iOS8" andName:@"BYU" andAge:24];
11         NSArray *arr=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,stu5,nil];       //将实例化的对象放入数组中
12         NSArray *sortArr1=[arr sortedArrayUsingSelector:@selector(compareWithClassAndName:)];    //将排序后的数组存入到新数组sortArr中
13         //NSLog(@"%@",sortArr1);     //采用description输出
14         for (Person *person in sortArr1){
15             NSLog(@"姓名：%@,班级：%@,年龄：%d",person.name,person.classes,person.age);
16         }
17         NSArray *sortArr2=[arr sortedArrayUsingSelector:@selector(compareWithAge:)];            //按年龄排序
18         for(Person *person in sortArr2){
19             NSLog(@"姓名：%@,班级：%@,年龄：%d",person.name,person.classes,person.age);
20         }
21     }
22     return 0;
23 }

Person.h:

 1 #import <Foundation/Foundation.h>
 2
 3 @interface Person : NSObject
 4 @property NSString *classes;
 5 @property NSString *name;
 6 @property int age;
 7 -(instancetype)initClasses:(NSString *)classes andName:(NSString *)name andAge:(int)age;        //初始化数据
 8 -(NSComparisonResult)compareWithClassAndName:(Person *)person;        //比较姓名和班级
 9 -(NSComparisonResult)compareWithAge:(Person *)person;       //比较年龄
10 @end

Person.m:

 1 #import "Person.h"
 2
 3 @implementation Person
 4 -(instancetype)initClasses:(NSString *)classes andName:(NSString *)name andAge:(int)age;        //初始化数据
 5 {
 6     Person *person=[[Person alloc]init];
 7     person.classes=classes;             //给classes赋值，后面的classes为主函数中实例化的数据传进来的形参
 8     person.name=name;
 9     person.age=age;
10     return person;
11 }
12 -(NSComparisonResult)compareWithClassAndName:(Person *)person;        //比较姓名和班级
13 {
14     NSComparisonResult result=[self.classes compare:person.classes];        //比较本类中的classes和传进来的classes
15     if(result==NSOrderedSame){
16         return [self.name compare:person.name];     //返回比较值
17     }
18     else{
19         return result;
20     }
21 }
22 -(NSComparisonResult)compareWithAge:(Person *)person;       //比较年龄
23 {
24     if(self.age==person.age){
25         return NSOrderedSame;
26     }
27     else if(self.age>person.age){
28         return NSOrderedDescending;
29     }
30     else{
31         return NSOrderedAscending;
32     }
33 }
34 -(NSString *)description{           //重写description使打印出来的带有格式
35     return [NSString stringWithFormat:@"Class:%@ Name:%@ Age:%d",self.classes,self.name,self.age];        //格式化输出
36 }
37 @end

（以上代码在Xcode 6.4中编译运行正常）