私は iOS 開発の初心者です。以下のような応答文字列があります。
{"7":"アフガニスタン","8":"アルバニア","9":"アルジェリア","10":"アンドラ","11":"アンゴラ","12":"アンティグア バーブーダ" ,"13":"アルゼンチン","14":"アルメニア","15":"オーストリア","16":"アゼルバイジャン","17":"バハマ","18":"バーレーン"," 19":"バングラデシュ"、"20":"バルバドス"、"21":"ベラルーシ"、"22":"ベルギー"、"23":"ベリーズ"、"24":"ベナン"、"25" :"ブータン","26":"ボリビア","27":"ボスニア・ヘルツェゴビナ","28":"ボツワナ","29":"ブラジル","30":"ブルネイ","31":"ブルガリア","32":"ブルキナファソ","33":"ブルンジ","34":"カンボジア","35":"カメルーン","36": "カナダ","37":"カーボベルデ","38":"中央アフリカ共和国","39":"チャド","40":"チリ","41":"中国","42" :"コロンビア","43":"コモロ","44":"コスタリカ","45":"コートジボワール","46":"クロアチア","47":"キューバ"," 48":"キプロス","49":"チェコ共和国","50":"コンゴ民主共和国","51":"デンマーク","52":"ジブチ","53":"ドミニカ","54":"ドミニカ共和国","55":"東ティモール","56":"エクアドル","57":"エジプト","58":"エルサルバドル","59":"赤道ギニア","60":"エリトリア","61":"エストニア","62":"エチオピア"}
国名リストを取得するのを手伝ってください。