iOS遍历数组相同值元素到同一对象的子数组

saledGoodsArray数组中存储商品对象saledgoods，saledgoods有seatNo属性，将saledGoodsArray数组中saledgoods对象相同座位儿号的商品赋值给同一个人(personObject)的购买商品数组(purchasedGoodsArr)。

刚发现可以这样写，惭愧得紧！

  dataArray = [[NSMutableArray alloc] init];

    saledGoodsArray = [ShoppingCartDataCenter queryNoPayGoodsByFlightID:@"8815"];

    NSMutableDictionary *personObjectDics = [[NSMutableDictionary alloc] init];

    for (NSInteger i=0; i<saledGoodsArray.count; i++) {
        SaledGoods *saledgoods = [saledGoodsArray objectAtIndex:i];
        SCPersonObject * personObject = [personObjectDics objectForKey:[saledgoods seatNo]];
        if (!personObject) {
            personObject = [[SCPersonObject alloc] init];
            [[personObject purchasedGoodsArr] addObject:saledgoods];
            [personObjectDics setObject:personObject forKey:[saledgoods seatNo]];
        }else {
            [[personObject purchasedGoodsArr] addObject:saledgoods];
        }
    }

    for (SCPersonObject * personObject in [personObjectDics allValues]) {
        if ([personObject isKindOfClass:[SCPersonObject class]]) {
            [dataArray addObject:personObject];
        }
    }

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