OC NSArray数组排序

一、一般排序

        // 排序
        NSArray *arr = @[@"1",@"3",@"2",@"5"];
        NSArray *newarr = [arr sortedArrayUsingSelector:@selector(compare:)];
        NSLog(@"%@",newarr);

二、高级排序（数组中存的是对象，按对象的属性进行排序）

#import <Foundation/Foundation.h>

@interface Student : NSObject

@property (assign ,nonatomic) int age;

//提供一种比较方式
- (NSComparisonResult)compareStudentWithAge:(Student *)tempStudent;


@end




#import "Student.h"

@implementation Student

- (NSComparisonResult)compareStudentWithAge:(Student *)tempStudent
{
　　　//方法1：

//    　　NSNumber *num1 = [[NSNumber alloc] initWithInteger:self.age];

//    　　NSNumber *num2 = [[NSNumber alloc] initWithInteger:tempStudent.age];

//    　　return [num1 compare:num2];

　　　　//方法2：
    if (self.age>tempStudent.age) {
        return NSOrderedDescending;
    }
    else if (self.age<tempStudent.age)
        return NSOrderedAscending;
    else
        return NSOrderedSame;
}

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

@end

#import <Foundation/Foundation.h>

#import "Student.h"
int main(int argc, const char * argv[]) {
    @autoreleasepool {

        Student *stu1 = [[Student alloc] init];
        stu1.age= 18;
        Student *stu2 = [[Student alloc] init];
        stu2.age= 15;
        Student *stu3 = [[Student alloc] init];
        stu3.age= 19;
        
        NSArray *stuArr = @[stu1,stu2,stu3];
        NSArray *newStuArr = [stuArr sortedArrayUsingSelector:@selector(compareStudentWithAge:)];
        NSLog(@"%@",newStuArr);
}
return 0;
}

三、超级排序（数组中对象多属性）

#import <Foundation/Foundation.h>

@interface People : NSObject

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

@end





#import "People.h"

@implementation People


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


#import <Foundation/Foundation.h>
#import "People.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        People *stu1 = [[People alloc] init];
        stu1.age = 18;
        stu1.score = 59;
        stu1.name = @"bowen1";
        
        People *stu2 = [[People alloc] init];
        stu2.age = 18;
        stu2.score = 59;
        stu2.name = @"bowen2";
        
        People *stu3 = [[People alloc] init];
        stu3.age = 20;
        stu3.score = 70;
        stu3.name = @"bowen3";
        
        People *stu4 = [[People alloc] init];
        stu4.age = 16;
        stu4.score = 62;
        stu4.name = @"bowen4";
        
        People *stu5 = [[People alloc] init];
        stu5.age = 15;
        stu5.score = 80;
        stu5.name = @"bowen5";
        
        NSArray *arr = @[stu1,stu2,stu3,stu4,stu5];
        
        // 排序描述，数组按属性排序 NSSortDescriptor
        NSSortDescriptor *ageSort = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:YES];
        NSSortDescriptor *scoreSort = [[NSSortDescriptor alloc] initWithKey:@"score" ascending:YES];
        NSSortDescriptor *nameScort = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
        
        //使用[排序描述]对数组进行排序
        NSArray *newArr = [arr sortedArrayUsingDescriptors:@[ageSort,scoreSort,nameScort]];
        
        NSLog(@"%@",newArr);
        
    }
    return 0;
}

@end