ios - 如何在以下字典中获取美国的所有城市？

Question

我下面有这本字典，我想访问特定国家的所有城市。因此，如果我在下面选择美国，则希望访问休斯顿的达拉斯。例如，我想到了以下功能，但不确定如何获取所有城市的国家/地区。

-(NSArray*) fetchCitiesFromLocationDictionary:(NSMutableDictionary *)locationDictionary usingCountry:(NSString *)country
{


}


{
    509f3a914d026b589ba3a090 =     {
        coordinates =         {
            latitude = "29.76429";
            longitude = "-95.3837";
        };
        country = USA;
        id = 509f3a914d026b589ba3a090;
        name = Houston;
        state = Texas;
    };
    509f3b3a4d026b589ba3a091 =     {
        coordinates =         {
            latitude = "3.138722";
            longitude = "101.686849";
        };
        country = Malaysia;
        id = 509f3b3a4d026b589ba3a091;
        name = "Kuala Lumpur";
    };
    509f475b4d026b589ba3a093 =     {
        coordinates =         {
            latitude = "32.803468";
            longitude = "-96.769879";
        };
        country = USA;
        id = 509f475b4d026b589ba3a093;
        name = Dallas;
        state = Texas;
    };
}

Answer 1

尝试这样的事情:

NSDictionary *dictionary = [NSDictionary dictionary];
NSMutableArray *cities = [NSMutableArray array];
for (NSDictionary *individualDictionary in dictionary)
{
    if ([[individualDictionary objectForKey:@"country"] isEqualToString:@"USA"])
        [cities addObject:[individualDictionary objectForKey:@"name"]];
}