前提・実現したいこと

swiftで下のようなJSONを読み込みたいです。
読み込みたい場所はvideoIDとtitleです

json
1{
2 "kind": "youtube#searchListResponse",
3 "etag": "\"XI7nbFXulYBIpL0ayR_gDh3eu1k/sK9J7bsFpx18009cMMg0Lm6BSUg\"",
4 "nextPageToken": "CAoQAA",
5 "regionCode": "JP",
6 "pageInfo": {
7  "totalResults": 7161,
8  "resultsPerPage": 10
9 },
10 "items": [
11  {
12   "kind": "youtube#searchResult",
13   "etag": "\"XI7nbFXulYBIpL0ayR_gDh3eu1k/n8MR9oEibzEjQGRvkJ2YD_uMgIo\"",
14   "id": {
15    "kind": "youtube#video",
16    "videoId": "pCQ8LDrTXbE"
17   },
18   "snippet": {
19    "publishedAt": "2016-08-12T09:30:01.000Z",
20    "channelId": "UCEzPCE4ULESqrp2m013wrlA",
21    "title": "【Minecraft】うるさいけどロマンなエスカレーター【へぼてっく】",
22    "description": "へぼてっくが、ヘボいテクでマインクラフトを楽しみます。 暇つぶし程度に見てください(笑) 万が一、役に立てることがあったら嬉しいのだけど...",
23    "thumbnails": {
24     "default": {
25      "url": "https://i.ytimg.com/vi/pCQ8LDrTXbE/default.jpg",
26      "width": 120,
27      "height": 90
28     },
29     "medium": {
30      "url": "https://i.ytimg.com/vi/pCQ8LDrTXbE/mqdefault.jpg",
31      "width": 320,
32      "height": 180
33     },
34     "high": {
35      "url": "https://i.ytimg.com/vi/pCQ8LDrTXbE/hqdefault.jpg",
36      "width": 480,
37      "height": 360
38     }
39    },
40    "channelTitle": "へぼてっくちゃんねる",
41    "liveBroadcastContent": "none"
42   }
43  },
44  {
45   "kind": "youtube#searchResult",
46   "etag": "\"XI7nbFXulYBIpL0ayR_gDh3eu1k/Q_XYdMQnRI09uy066b4JDGYJHX4\"",
47   "id": {
48    "kind": "youtube#video",
49    "videoId": "3gaRTWP8jwI"
50   },
51   "snippet": {
52    "publishedAt": "2015-02-06T09:00:16.000Z",
53    "channelId": "UCEzPCE4ULESqrp2m013wrlA",
54    "title": "【Minecraft】完全水抜き海底神殿で迷うw【へぼてっく】",
55    "description": "へぼてっくが、ヘボいテクでマインクラフトを楽しみます。 暇つぶし程度に見てください(笑) 万が一、役に立てることがあったら嬉しいのだけど...",
56    "thumbnails": {
57     "default": {
58      "url": "https://i.ytimg.com/vi/3gaRTWP8jwI/default.jpg",
59      "width": 120,
60      "height": 90
61     },
62     "medium": {
63      "url": "https://i.ytimg.com/vi/3gaRTWP8jwI/mqdefault.jpg",
64      "width": 320,
65      "height": 180
66     },
67     "high": {
68      "url": "https://i.ytimg.com/vi/3gaRTWP8jwI/hqdefault.jpg",
69      "width": 480,
70      "height": 360
71     }
72    },
73    "channelTitle": "へぼてっくちゃんねる",
74    "liveBroadcastContent": "none"
75   }
76  },
77  {
78   "kind": "youtube#searchResult",
79   "etag": "\"XI7nbFXulYBIpL0ayR_gDh3eu1k/J3jkHc1QCoTbjo5VVrt58e7rIy0\"",
80   "id": {
81    "kind": "youtube#video",
82    "videoId": "lYU4Hmnov00"
83   },
84   "snippet": {
85    "publishedAt": "2016-05-20T09:30:00.000Z",
86    "channelId": "UCEzPCE4ULESqrp2m013wrlA",
87    "title": "【Minecraft】Gホイホイ的なエンダーマントラップタワー【へぼてっく】",
88    "description": "へぼてっくが、ヘボいテクでマインクラフトを楽しみます。 暇つぶし程度に見てください(笑) 万が一、役に立てることがあったら嬉しいのだけど...",
89    "thumbnails": {
90     "default": {
91      "url": "https://i.ytimg.com/vi/lYU4Hmnov00/default.jpg",
92      "width": 120,
93      "height": 90
94     },
95     "medium": {
96      "url": "https://i.ytimg.com/vi/lYU4Hmnov00/mqdefault.jpg",
97      "width": 320,
98      "height": 180
99     },
100     "high": {
101      "url": "https://i.ytimg.com/vi/lYU4Hmnov00/hqdefault.jpg",
102      "width": 480,
103      "height": 360
104     }
105    },
106    "channelTitle": "へぼてっくちゃんねる",
107    "liveBroadcastContent": "none"
108   }
109  }
110 ]
111}
112

###今のコード

swift
1class ItemSearchResultSet: Codable {
2    var items: Items
3    
4    private enum CodingKeys: String, CodingKey {
5        case items = "items"
6    }
7}
8
9class Items: Codable {
10    var id: Id
11    var snippet: Snippet
12    
13    private enum CodingKeys: String, CodingKey {
14        case id = "id"
15        case snippet = "snippet"
16    }
17}
18
19class Snippet: Codable {
20    var title: Title
21    
22    private enum CodingKeys: String, CodingKey {
23        case title = "title"
24    }
25}
26
27class Id: Codable {
28    var items: [ItemData] = [ItemData]()
29    required init(from decoder: Decoder) throws {
30        let container = try decoder.container(keyedBy: CodingKeys.self)
31        let keys = container.allKeys.sorted {
32            Int($0.rawValue)! < Int($1.rawValue)!
33        }
34        for key in keys {
35            let item = try container.decode(ItemData.self, forKey: key)
36            items.append(item)
37        }
38    }
39    
40    func encode(to encoder: Encoder) throws {
41    }
42    
43    private enum CodingKeys: String, CodingKey {
44        case hit0 = "0"
45        case hit1 = "1"
46        case hit2 = "2"
47        case hit3 = "3"
48        case hit4 = "4"
49        case hit5 = "5"
50        case hit6 = "6"
51        case hit7 = "7"
52        case hit8 = "8"
53        case hit9 = "9"
54        case hit10 = "10"
55        case hit11 = "11"
56        case hit12 = "12"
57        case hit13 = "13"
58        case hit14 = "14"
59        case hit15 = "15"
60        case hit16 = "16"
61        case hit17 = "17"
62        case hit18 = "18"
63        case hit19 = "19"
64        case hit20 = "20"
65    }
66    
67}
68
69class Title: Codable {
70    var items: [ItemData] = [ItemData]()
71    required init(from decoder: Decoder) throws {
72        let container = try decoder.container(keyedBy: CodingKeys.self)
73        let keys = container.allKeys.sorted {
74            Int($0.rawValue)! < Int($1.rawValue)!
75        }
76        for key in keys {
77            let item = try container.decode(ItemData.self, forKey: key)
78            items.append(item)
79        }
80    }
81    
82    func encode(to encoder: Encoder) throws {
83    }
84    
85    private enum CodingKeys: String, CodingKey {
86        case hit0 = "0"
87        case hit1 = "1"
88        case hit2 = "2"
89        case hit3 = "3"
90        case hit4 = "4"
91        case hit5 = "5"
92        case hit6 = "6"
93        case hit7 = "7"
94        case hit8 = "8"
95        case hit9 = "9"
96        case hit10 = "10"
97        case hit11 = "11"
98        case hit12 = "12"
99        case hit13 = "13"
100        case hit14 = "14"
101        case hit15 = "15"
102        case hit16 = "16"
103        case hit17 = "17"
104        case hit18 = "18"
105        case hit19 = "19"
106        case hit20 = "20"
107    }
108    
109}
110
111class ItemData: Codable {
112    var title: String = ""
113    var videoId: String = ""
114    
115    private enum CodingKeys: String, CodingKey {
116//        case title = "title"
117        case videoId = "videoId"
118    }
119    
120}
121
122
123
124class ViewController: UIViewController , UISearchBarDelegate {
125
126    @IBOutlet var searchBar: UISearchBar!
127    
128    var itemDataArray = [ItemData]()
129
130    let appid = "AIzaSyCAIznRo4MUdgBtijMnd2De9YEUqMdmwaY"
131    
132    let entryUrl: String = "https://www.googleapis.com/youtube/v3/search?key=AIzaSyCAIznRo4MUdgBtijMnd2De9YEUqMdmwaY&q="
133
134    override func viewDidLoad() {
135        super.viewDidLoad()
136        // Do any additional setup after loading the view, typically from a nib.
137        
138        searchBar.placeholder = "ここに入力してください"
139        searchBar.delegate = self
140    }
141
142    override func didReceiveMemoryWarning() {
143        super.didReceiveMemoryWarning()
144        // Dispose of any resources that can be recreated.
145    }
146
147    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
148        
149        print("検索ボタンがタップされました!")
150
151        guard let inputText = searchBar.text else {
152            return
153        }
154
155        guard inputText.lengthOfBytes(using: String.Encoding.utf8) > 0 else {
156            return
157        }
158       
159        itemDataArray.removeAll()
160
161        let parameter = ["appid": appid, "query": inputText]
162       
163        guard let escapedInputText = inputText.addingPercentEncoding(
164            withAllowedCharacters: CharacterSet.urlQueryAllowed
165            ) else {
166                return
167        }
168        let requestUrl = entryUrl + escapedInputText + "&part=snippet&maxResults=10&order=viewCount"
169        
170
171        request(requestUrl: requestUrl)
172
173        searchBar.resignFirstResponder()
174        print(itemDataArray)
175    }
176    
177    func request(requestUrl: String) {
178        print(1)
179
180        guard let url = URL(string: requestUrl) else {
181            return
182        }
183       
184        let request = URLRequest(url: url)
185        let session = URLSession.shared
186        let task = session.dataTask (with: request) { (data:Data?, response:URLResponse?, error:Error?) in
187            guard error == nil else {
188                let alert = UIAlertController(title: "エラー", message: error?.localizedDescription, preferredStyle: .alert)
189                DispatchQueue.main.async {
190                    self.present(alert, animated: true, completion: nil)
191                }
192                return
193            }
194            
195            guard let data = data else {
196                return
197            }
198            
199            do {
200                let resultSet = try JSONDecoder().decode(ItemSearchResultSet.self, from: data)
201                
202                self.itemDataArray.append(contentsOf: resultSet.items.id.items)
203//                self.itemDataArray.append(contentsOf: resultSet.items.snippet.title.items)
204                print("データーが追加されました")
205                print(self.itemDataArray)
206            } catch let error {
207                print("## error: (error)")
208            }
209            DispatchQueue.main.async {
210//                self.tableView.reloadData()
211            }
212        }
213        print(2)
214        task.resume()
215    }
216}

###エラー

コンソールに

## error: keyNotFound(CodingKeys(stringValue: "items", intValue: nil), Swift.DecodingError.Context(codingPath: [], debugDescription: "No value associated with key CodingKeys(stringValue: \"items\", intValue: nil) (\"items\").", underlyingError: nil))

と表示されています。

###困っている点

ネットを見たり本を見たりしながらやっているのですがうまく読み込んでくれません。

補足情報

swift4.1
ios11.4

fuzzball

2018/09/12 00:06

コードを書いて下さい。

行動規範の内容に同意します

回答2件

ベストアンサー

SwiftyJSONを利用しましょう。
https://github.com/SwiftyJSON/SwiftyJSON
サンプルプロジェクトをベース適応させてみてください。

投稿2018/09/15 09:44

Leader731

総合スコア20

間違い探し

swift
1class ItemSearchResultSet: Codable {
2    var items: [Items] //配列です
3    :
4}
5
6class Snippet: Codable {
7    var title: String //ただの文字列です
8    :
9}

投稿2018/09/13 01:26

fuzzball

総合スコア16731

denshatrain

2018/09/13 20:58

`ItemSearchResultSet`のところを`[item]`に変えたのですが今度は `Extraneous argument label 'contentsOf:' in call Replace 'contentsOf: ' with ''` というエラーが出ます。それを直すと今度は `Value of type '[Items]' has no member 'snippet'`というエラーが出ます。どうしたら良いでしょうか。