JSON解析Swift 4 [英] JSON Parsing Swift 4

问题描述

我试图解析一些JSON数据，但是遇到了一些麻烦.这是JSON:

I was trying to parse some JSON data but had some trouble. Here is the JSON:

    {
  "result": {
    "artist": {
      "name": "The Beatles"
    },
    "track": {
      "name": "Yesterday",
      "text": "[Verse 1]\nYesterday\nAll my troubles seemed so far away\nNow it looks as though they're here to stay\nOh, I believe in yesterday\n\n[Verse 2]\nSuddenly\nI'm not half the man I used to be\nThere's a shadow hanging over me\nOh, yesterday came suddenly\n\n[Chorus]\nWhy she had to go\nI don't know, she wouldn't say\nI said something wrong\nNow I long for yesterday\n\n[Verse 3]\nYesterday\nLove was such an easy game to play\nNow I need a place to hide away\nOh, I believe in yesterday\n\n[Chorus]\nWhy she had to go\nI don't know, she wouldn't say\nI said something wrong\nNow I long for yesterday\n\n[Verse 4]\nYesterday\nLove was such an easy game to play\nNow I need a place to hide away\nOh, I believe in yesterday",
      "lang": {
        "code": "en",
        "name": "English"
      }
    },
    "copyright": {
      "notice": "Yesterday lyrics are property and copyright of their owners. Commercial use is not allowed.",
      "artist": "Copyright The Beatles",
      "text": "All lyrics provided for educational purposes and personal use only."
    },
    "probability": "75.00",
    "similarity": 1
  }
} 

这是到目前为止的代码:

And here is my code so far:

        guard let url = URL(string: "https://orion.apiseeds.com/api/music/lyric/Beatles\Yesterday?apikey=xxx") else { return }

        URLSession.shared.dataTask(with: url) { (data, response, error) in

            if error != nil {

                print(error!)
            }

            guard let data = data else { return }
            do {

                let data = try JSONDecoder().decode(Result.self, from: data)
                print(data)
            } catch let jsonError {

                print(jsonError)
            }
        }.resume()

struct Result: Codable {

    let artist: [Artist]
}

struct Artist: Codable {

    let name: String
}

我尝试运行它时遇到的错误是:

The error that I get when I try to run it is:

keyNotFound(CodingKeys(stringValue:"artist"，intValue:nil)， Swift.DecodingError.Context(codingPath:[]，debugDescription:否 与键CodingKeys(stringValue:\"artist \"， intValue:nil)(\"artist \").，underlyingError:nil))

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

我要做的就是从这首歌中获取歌词. 请耐心等待，因为我正在努力挣扎很多.

All I would like to do is get the lyrics from the song. Please could someone look at this as I am struggling quite a lot.

推荐答案

如果某些东西带有nil，请为您的模型创建一个合适的结构，将其设置为可选，否则会崩溃，将 JSON 转换为对象，您将来可以使用此在线工具，很有用！ https://app.quicktype.io/

Create a proper struct for your model if something comes with a nil, make it optional otherwise it will crash, to convert JSON to Objects you can use this online tool for the future, is quite useful! https://app.quicktype.io/

struct AudioSearch: Codable {
    let result: Result
}

struct Result: Codable {
    let artist: Artist
    let track: Track
    let copyright: Copyright
    let probability: String
    let similarity: Int
}

struct Artist: Codable {
    let name: String
}

struct Copyright: Codable {
    let notice, artist, text: String
}

struct Track: Codable {
    let name, text: String
    let lang: Lang
}

struct Lang: Codable {
    let code, name: String
}

并使用这样的解码:

let result = try JSONDecoder().decode(AudioSearch.self, from: data)

这篇关于JSON解析Swift 4的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！