oc之类排序

 1 #import <Foundation/Foundation.h>
 2 #import "Person.h"
 3 #define NSLog(FORMAT, ...) printf("%s\n", [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String])
 4 
 5 int main(int argc, const char * argv[]) {
 6     @autoreleasepool {
 7         Person *stu1=[[Person alloc]initClasses:@"IOS8"
 8                                         andName:@"ZXY"
 9                                         andAge:22];
10         Person *stu2=[[Person alloc]initClasses:@"IOS8"
11                                         andName:@"ASD"
12                                          andAge:24];
13         Person *stu3=[[Person alloc]initClasses:@"IOS7"
14                                         andName:@"JYC"
15                                          andAge:21];
16         Person *stu4=[[Person alloc]initClasses:@"IOS7"
17                                         andName:@"GFD"
18                                          andAge:23];
19         NSArray *arr=[NSArray arrayWithObjects:stu1,stu2,stu3,stu4,nil];
20 
21         NSArray *sortArr=[arr sortedArrayUsingSelector:@selector(compareWithClassAndName:)];
22         for(Person *person in sortArr){
23             NSLog(@"班级%@ 姓名%@ 年龄%d",person.classes,person.name,person.age);
24         }
25        NSLog(@"%@",sortArr);
26        
27     }
28     return 0;
29 }

 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;
 8 //instancetype  返回输入的对象  instancetype 可以反回和方法所在类相同类型的对象
 9 -(NSComparisonResult)compareWithClassAndName:(Person *)person;
10 -(NSComparisonResult)compareWithAge:(Person *)person;
11 
12 @end

#import "Person.h"

@implementation Person
-(instancetype)initClasses:(NSString *)classes andName:(NSString *)name andAge:(int)age{
    Person *person=[[Person alloc]init];
    person.classes=classes;
    person.name=name;
    person.age=age;
    return person;
}
-(NSComparisonResult)compareWithClassAndName:(Person *)person{
    NSComparisonResult result=[self.classes compare:person.classes];
    if(result==NSOrderedSame){ 
        return [self.name compare:person.name];//如果班级相同，则返回姓名排序的结果
    }else{
        return result;                          //如果班级不同，则返回班级排序结果
    }
}
-(NSComparisonResult)compareWithAge:(Person *)person{
    if(self.age==person.age){
        return NSOrderedSame;
    }else if(self.age>person.age){
        return NSOrderedDescending;
    }else{
        return NSOrderedAscending;
    }

}
-(NSString *)description{
    return [NSString stringWithFormat:@"class:%@ name:%@ age:%d",self.classes,self.name,self.age];
}

@end