Object-C-Foundation-数组排序

系统类型排序;

NSArray *goodsNames =@[@"computer",@"iphone",@"ipad"];

NSArray *sortedArray=[goodsNames sortedArrayUsingSelector:@selector(compare:)];

自定义排序

Person *p1=[[Person alloc]initWithName:@"tom" andAge:12 andCard:nil];

Person *p2=[[Person alloc]initWithName:@"jack" andAge:23 andCard:nil];

Person *p1=[[Person alloc]initWithName:@"maggie" andAge:11 andCard:nil];

 NSArry *personsArray=@[p1,p2,p3];

在person类中定义一个comparePerson方法

/***************************************************************

-(NSComparisonResult)comparePerson:(Person *)person

{

　　  NSNumber *age1=[[NSNumber alloc]initWithInt:self.age];

　　  NSnumber *age2=[[NSNumber alloc]initWithInt:person.age];

  　　NSComparisonResult result=[age1 compare:age2];

　　if(result == NSOrderedSame)

　　　　{

     　　　　result=[self.name compare:person.name];

　　　　}

  　　return result;

}

/******************************************************************

NSArray *personsArray=@[p1,p2,p3];

NSArray *sortedArray=[personsArray sortedArrayUsingSelector:@selector(comparePerson:)];

完成对personsArray进行排序

使用block进行排序

NSArray *sortedArray=[personsArray sortedArrayUsingComparator:^NSComparisonResult(id obj1,id obj2){

     Person *p1=(Person *)obj1;

     Person *p2=(Person *)obj2;

     NSNumber *age1=[[NSNumber alloc]initWithInt:self.age];

　　  NSnumber *age2=[[NSNumber alloc]initWithInt:person.age];

  　　NSComparisonResult result=[age1 compare:age2];

　　if(result == NSOrderedSame)

　　　　{

     　　　　result=[self.name compare:person.name];

　　　　}

  　　return result;

}

复杂排序

NSSortDescriptor

NSSortDescriptor *sort1=[[NSSortDescriptor]initWithKey:@"name" ascending:YES];

NSSortDescriptor *sort2=[[NSSortDescriptor]initWithKey:@"age" ascending:YES];

NSArray *conditionsArray=@[sort1,sort2];

NSArray *sortedArray =[personsArray sortedArrayUsingDescriptors:conditionsArray];

/*******************

NSSortDescriptor *sort1=[[NSSortDescriptor]initWithKey:@"name" ascending:YES];

NSSortDescriptor *sort2=[[NSSortDescriptor]initWithKey:@"self.card.balance" ascending:YES];