ios-高级排序

我们排序一般使用系统提供的或者是我们自定义的排序

但是遇到了复杂的排序 就会很麻烦的 这里我们可以采用 一种高级排序的方法

下面给大家介绍一下 很好用 直接上代码

#import <Foundation/Foundation.h>

@interface User : NSObject


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


+ (User *)userWithName:(NSString *)name age:(int)age;
@end

#import "User.h"

@implementation User
+ (User *)userWithName:(NSString *)name age:(int)age
{
    User *user = [[self alloc]init];
    user.name = name;
    user.age = age;
    return user;
}

- (NSString *)description
{
    return [NSString stringWithFormat:@"%@- %d",_name,_age];

}
@end

#import "ViewController.h"
#import "User.h"
@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    /*
     
     */
//    [self sort];
    [self sort2];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)sort2
{
    //-w 表示不显示警告 在编译文件中修改
    //先按照名字升序 如果名字一样 再按照年龄降序
    User *u1 = [User userWithName:@"a1" age:10];
    User *u2 = [User userWithName:@"a2" age:20];
    User *u3 = [User userWithName:@"a3" age:60];
    User *u4 = [User userWithName:@"a4" age:20];
    User *u5 = [User userWithName:@"a5" age:50];
    User *u6 = [User userWithName:@"a6" age:90];
    
    NSArray *array = @[u1,u2,u3,u4,u5,u6];
    //名字
    NSSortDescriptor *nameSort = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
    //年龄
    NSSortDescriptor *ageSort = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:NO];
    NSArray *sortArr = [array sortedArrayUsingDescriptors:@[nameSort,ageSort]];
    
    for (User *user in sortArr) {
        NSLog(@"%@",user);
    }
}


- (void)sort
{
    NSArray *array = @[@23,@90,@34,@56,@12];
//    NSArray *sortArr = [array sortedArrayUsingSelector:@selector(compare:)];
//    NSLog(@"%@",sortArr);//降序
    //降序
    NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:nil ascending:YES];
    //排序
    NSArray *sortArr = [array sortedArrayUsingDescriptors:@[sort]];
    NSLog(@"%@",sortArr);
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end