排序(I)

NSSortDescriptor 排序

Person类

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface Person : NSObject
 4 
 5 @property (nonatomic, copy) NSString *name;
 6 @property (nonatomic, assign) BOOL sex;
 7 @property (nonatomic, assign) double height;
 8 @property (nonatomic, assign) int age;
 9 
10 @end

View Code

排序调用方法

 1 - (void) test {
 2     
 3     NSArray *names = @[@"夏侯惇", @"貂蝉", @"诸葛亮", @"张三", @"李四", @"流火绯瞳", @"流火", @"李白", @"张飞", @"韩信", @"范冰冰", @"赵丽颖"];
 4     NSArray *ages = @[@32, @32, @45, @32, @32, @27, @15, @67, @55, @34, @44, @30];
 5     NSArray *heights = @[@170, @163, @180, @165, @163, @176, @174, @183, @186, @178, @167, @160];
 6     
 7     NSMutableArray *peoples = [NSMutableArray arrayWithCapacity:names.count];
 8     for (int i = 0; i<names.count; i++) {
 9         
10         Person *pe = [[Person alloc]init];
11         pe.name = names[i];
12         pe.age = [ages[i] intValue];
13         pe.height = [heights[i] doubleValue];
14         [peoples addObject:pe];
15     }
16     
17     
18     NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
19     
20     [peoples sortUsingDescriptors:@[sort]];
21     
22     // 输出排序结果
23     for (Person *people in peoples) {
24         NSLog(@"------------->age: %d,height: %f name: %@\n", people.age,people.height, people.name);
25     }
26     
27     
28 }

View Code

参数
key : 排序key, 某个对象的属性名称; 如果对字符串进行排序, 则传nil
ascending : 是否升序, YES-升序, NO-降序

打印结果：

2018-05-19 19:11:43.904288+0800 Test[7264:81290] ------------->age: 15,height: 174.000000 name: 流火

2018-05-19 19:11:43.904436+0800 Test[7264:81290] ------------->age: 27,height: 176.000000 name: 流火绯瞳

2018-05-19 19:11:43.904527+0800 Test[7264:81290] ------------->age: 30,height: 160.000000 name: 赵丽颖

2018-05-19 19:11:43.904632+0800 Test[7264:81290] ------------->age: 32,height: 170.000000 name: 夏侯惇

2018-05-19 19:11:43.904732+0800 Test[7264:81290] ------------->age: 32,height: 163.000000 name: 貂蝉

2018-05-19 19:11:43.904832+0800 Test[7264:81290] ------------->age: 32,height: 165.000000 name: 张三

2018-05-19 19:11:43.904924+0800 Test[7264:81290] ------------->age: 32,height: 163.000000 name: 李四

2018-05-19 19:11:43.905017+0800 Test[7264:81290] ------------->age: 34,height: 178.000000 name: 韩信

2018-05-19 19:11:43.905098+0800 Test[7264:81290] ------------->age: 44,height: 167.000000 name: 范冰冰

2018-05-19 19:11:43.905186+0800 Test[7264:81290] ------------->age: 45,height: 180.000000 name: 诸葛亮

2018-05-19 19:11:43.905271+0800 Test[7264:81290] ------------->age: 55,height: 186.000000 name: 张飞

2018-05-19 19:11:43.905359+0800 Test[7264:81290] ------------->age: 67,height: 183.000000 name: 李白