OBjective-C:在可变数组NSMutableArray中添加相同对象后,进行自定义的排序方式输出

　　以下为自定义的排序方式的实现

 #import "Person+Compare.h"

 @implementation Person (Compare)
 -(NSComparisonResult)CompareByName:(Person*)aPerson
 {
     return [self.name compare:aPerson.name];
 }
 -(NSComparisonResult)CompareByAge:(Person*)aPerson
 {
     if(self.age > aPerson.age)
         return NSOrderedDescending;
     else if (self.age < aPerson.age)
         return NSOrderedAscending;
     else
         return NSOrderedSame;
 }
 @end

　　主函数测试：

　　

#import <Foundation/Foundation.h>

#import "Person+Compare.h"

#import "Person.h"

int main(int argc, const char * argv[])

{

@autoreleasepool

{

NSMutableArray *personArray = [[NSMutableArray alloc]initWithCapacity:20];

[personArray addObject:[Person personWithName:@"Tom" andAge:20]];

[personArray addObject:[Person personWithName:@"Smith" andAge:21]];

[personArray addObject:[Person personWithName:@"Jhon" andAge:19]];

[personArray addObject:[Person personWithName:@"Bruth" andAge:24]];

//按姓名排序

NSMutableArray *sortedByName = [NSMutableArray arrayWithArray:[personArray sortedArrayUsingSelector:@selector(CompareByName:)]];

NSLog(@"%@",sortedByName);

//按年龄排序

NSMutableArray *sortedByAge = [NSMutableArray arrayWithArray:[personArray sortedArrayUsingSelector:@selector(CompareByAge:)]];

NSLog(@"%@",sortedByAge);

}

return 0;

}

　　测试结果为：

-- ::26.997 可变数组的排序[:] (
    "name=Bruth,age=24",
    "name=Jhon,age=19",
    "name=Smith,age=21",
    "name=Tom,age=20"
)
-- ::26.998 可变数组的排序[:] (
    "name=Jhon,age=19",
    "name=Tom,age=20",
    "name=Smith,age=21",
    "name=Bruth,age=24"
)
Program ended with exit code: