具有相同属性的字典的分组

//想要得到的效果：最后是一个总数组，含有两个数组，每个数组含有两个字典，两个字典中的price相同
    
    NSMutableArray *myMutableArr = [[NSMutableArray alloc] init];
    NSDictionary *dic1 = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"price",@"2",@"number", nil];
    NSDictionary *dic2 = [NSDictionary dictionaryWithObjectsAndKeys:@"3",@"price",@"5",@"number", nil];
    NSDictionary *dic3 = [NSDictionary dictionaryWithObjectsAndKeys:@"3",@"price",@"1",@"number", nil];
    NSDictionary *dic4 = [NSDictionary dictionaryWithObjectsAndKeys:@"1",@"price",@"3",@"number", nil];
    [myMutableArr addObject:dic1];
    [myMutableArr addObject:dic2];
    [myMutableArr addObject:dic3];
    [myMutableArr addObject:dic4];
    NSLog(@"myMutableArr = %@",myMutableArr);
    
    //剔选出price不同的值，并组成数组
    //本例中price等于1和3,arr = (1,3)
    NSNumber * number;
    NSMutableArray * priceArray= [[NSMutableArray alloc]init];
    for (int i = 0; i<[myMutableArr count]; i++)
    {
         number = [[myMutableArr objectAtIndex:i] valueForKey:@"price"];
        [priceArray addObject:number];
    }
    NSSet *set = [NSSet setWithArray:priceArray];
    NSLog(@"priceArray = %@",[set allObjects]);
    NSInteger cout = [[set allObjects] count];

    //根据arr数值的不同  得到price相同的分组
    NSMutableArray *lastArray = [[NSMutableArray alloc]init];//初始化最终的Array

    for (int i = 0; i<cout; i++)
    {
        __block  NSMutableArray * tempArray = [NSMutableArray arrayWithCapacity:0];
        [myMutableArr enumerateObjectsUsingBlock:^(NSDictionary * dic, NSUInteger idx, BOOL *stop) {
            
            NSString * name = [dic valueForKey:@"price"];
            NSRange range = [name rangeOfString:[NSString stringWithFormat:@"%@",[[set allObjects] objectAtIndex:i]]];
            if (range.length != 0)
            {
                [tempArray addObject:dic];
            }
            
        }];
        NSLog(@"tempArray = %@",tempArray);
        
        //把得到的分组数组 合并成最终数组
        [lastArray addObject:tempArray];
    }
    
    NSLog(@"最终的Array = %@",lastArray);

 

 

//最初的数组

2014-02-14 14:46:09.598 123456[1596:c07] myMutableArr = (
        {
        number = 2;
        price = 1;
    },
        {
        number = 5;
        price = 3;
    },
        {
        number = 1;
        price = 3;
    },
        {
        number = 3;
        price = 1;
    }
)

//最终的数组
2014-02-14 14:46:09.601 123456[1596:c07] 最终的Array = (
        (
                {
            number = 5;
            price = 3;
        },
                {
            number = 1;
            price = 3;
        }
    ),
        (
                {
            number = 2;
            price = 1;
        },
                {
            number = 3;
            price = 1;
        }
    )
)