iOS开发中对数组元素进行排序

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直接上代码, 请看:
////  ViewController.m//  数组排序////  Created by Wangjunling on 16/4/12.//  Copyright © 2016年 Wangjunling. All rights reserved.//#import "ViewController.h"#import "Person.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    [self sortFunc1];    [self sortFunc2];    }//方法1- (void)sortFunc1 {     NSArray *arr = @[@2, @9, @334, @66, @5, @15];    //1.使用系统的Compare方法    NSArray *sortResultArr = [arr sortedArrayUsingSelector:@selector(compare:)];    NSLog(@"%@", sortResultArr);}//方法2- (void)sortFunc2 {    Person *p1 = [Person new];    p1.name = @"xiaohua5";    p1.age = 18;    p1.score = 99;    Person *p2 = [Person new];    p2.name = @"xiaohua8";    p2.age = 18;    p2.score = 88;    Person *p3 = [Person new];    p3.name = @"xiaohua6";    p3.age = 17;    p3.score = 77;    NSArray *personArr = @[p1, p2, p3];    //2.使用自定义的compare方法, 此方法为block形式,代码简洁直观    NSArray *sortResultArr = [personArr sortedArrayUsingComparator:^NSComparisonResult(Person *obj1, Person *obj2) {        NSComparisonResult result = [@(obj1.age) compare:@(obj2.age)];        if (result == NSOrderedSame) {            result = [obj1.name compare:obj2.name];        }        return result;    }];     NSLog(@"%@", sortResultArr);}//方法3 通过排序描述器排序, 此方法方便通过某个字段去比较, 在实际开发中最常见- (void)sortFunc3 {    Person *p1 = [Person new];    p1.name = @"xiaohua5";    p1.age = 18;    p1.score = 99;    Person *p2 = [Person new];    p2.name = @"xiaohua8";    p2.age = 18;    p2.score = 88;    Person *p3 = [Person new];    p3.name = @"xiaohua6";    p3.age = 17;    p3.score = 77;    NSArray *personArr = @[p1, p2, p3];    //排序描述:即要排序的字段,    NSSortDescriptor *descriptor1 = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:true];    //排序描述:即要排序的字段,    NSSortDescriptor *descriptor2 = [NSSortDescriptor sortDescriptorWithKey:@"score" ascending:true];    //Descriptors参数为数组, 放入要排序的字段, 系统会按照先后顺序排序,    //上面的p1 p2 p3 先按照年龄排序, 年龄一样的在按照分数排序    NSArray *sortResultArr = [personArr sortedArrayUsingDescriptors:@[descriptor1,descriptor2]];    NSLog(@"%@", sortResultArr);}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end
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