Objective-C 数组对象排序

#import <Foundation/Foundation.h>

@interface Person : NSObject

@property (copy, nonatomic) NSString *name;
@property (assign, nonatomic) NSInteger age;

-(instancetype)initWithName:(NSString *)name age:(NSInteger)age;

-(void)printPerson;

#import "Person.h"

@implementation Person

-(instancetype)initWithName:(NSString *)name age:(NSInteger)age {
    self = [super init];
    if (self) {
        self.name = name;
        self.age = age;
    }
    return self;
}

-(void)printPerson {
    NSLog(@"Name is %@ ageis %ld ",_name, _age);
}

        Person *p1 = [[Person alloc] initWithName:@"aa" age:26];
        Person *p2 = [[Person alloc] initWithName:@"bb" age:15];
        Person *p3 = [[Person alloc] initWithName:@"cc" age:6];
        Person *p4 = [[Person alloc] initWithName:@"dd" age:30];
        Person *p5 = [[Person alloc] initWithName:@"ee" age:5];
        
        NSArray *personArr = @[p1,p2,p3,p4,p5];
        
        // 为每个属性创建NSSortDescriptor对象
        NSSortDescriptor *sdAge = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
        NSSortDescriptor *sdName = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
        
        NSArray * sortedArray = [personArr sortedArrayUsingDescriptors:@[sdAge,sdName]];
        // 为数组中每个元素执行方法，输出状态
        [sortedArray makeObjectsPerformSelector:@selector(printPerson)];

018-05-23 11:09:49.648013+0800 ArrayObjectSort[40836:2856845] Name is ee ageis 5
2018-05-23 11:09:49.648045+0800 ArrayObjectSort[40836:2856845] Name is cc ageis 6
2018-05-23 11:09:49.648061+0800 ArrayObjectSort[40836:2856845] Name is bb ageis 15
2018-05-23 11:09:49.648074+0800 ArrayObjectSort[40836:2856845] Name is aa ageis 26
2018-05-23 11:09:49.648087+0800 ArrayObjectSort[40836:2856845] Name is dd ageis 30