iOS 获取国家列表、转json

    NSLocale *locale = [NSLocale
currentLocale];
    
    NSArray *countryArray = [NSLocale
ISOCountryCodes];
    NSMutableDictionary *objectDic = [[NSMutableDictionary
alloc] init];
    for (NSString *countryCode
in countryArray)
    {
        NSString *displayNameString = [locale
displayNameForKey:NSLocaleCountryCode
value:countryCode];
        [objectDic setObject:displayNameString
forKey:countryCode];
    }
    NSString *jsonString = [objectDic
jsonStringEncoded];
    NSLog(@"json：%@",jsonString);
    NSLog(@"%@",objectDic);