ios - 如何创建一个包含键值对的子NSArray？

Question

我有以下NsArray，我想对其进行排序并创建一个包含特定键值对的子数组。

{
scores =     (
            {
        category = 2;
        "league_code" = epl;
        "team_away" = Everton;
        "team_home" = Liverpool;
    },
            {
        category = 2;
        "league_code" = epl;
        "team_away" = Fulham;
        "team_home" = "Swansea City";
    },
             {
    category = 3;
     "league_code" = ita;
    "team_away" = Torino;
    "team_home" = Milan;
},
    {
    category = 3;
     "league_code" = ita;
    "team_away" = Lazio;
    "team_home" = Juve;
}

}
}

并且我想创建一个新数组或只修改数组以仅包含“league_code” = epl键的对象。

所以我想得到

    {
scores =     (
            {
        category = 2;
        "league_code" = epl;
        "team_away" = Everton;
        "team_home" = Liverpool;
    },
            {
        category = 2;
        "league_code" = epl;
        "team_away" = Fulham;
        "team_home" = "Swansea City";
    }

}
}

我试图将其转换为使用dictionaryWithObjects:forKeys，但是没有用。

Answer 1

NSMutableArray* newArray = [NSMutableArray array];
NSArray* oldArray = outerDictionary[@"scores"];
for (NSDictionary* dictEntry in oldArray) {
    NSString* leagueCode = dictEntry[@"league_code"];
    if ([leagueCode isEqualToString @"epl"]) {
        [newArray addObject:dictEntry];
    }
}

那样难吗？