Question

我正在尝试从newsapi.org解析一些JSON数据。我有一个JSONDecoder()

的模型班

我试图将JSON数据解析为的模型是：

struct ArticleService: Decodable {

    var totalResults:Int?
    var articles:[Articles]?
}
struct Articles: Decodable {

    var author:String?
    var title:String?
    var description:String?
    var url:String?
    var urlToImage:String?
    var publishedAt:Date?
    var content:String?
}

Decoder：

protocol ArticleModelProtocol {

    func articlesRetrieved(_ articles: [Articles]) 
}

class ArticleModel {

    var delegate: ArticleModelProtocol?

func getArticles() {

    let urlString = "https://newsapi.org/v2/top-headlines?sources=techcrunch&apiKey=018f69dd3e7f467996bb8bd648d7739e"
    let url = URL(string: urlString)

    guard url != nil else { return print("could not load url")}

    let session = URLSession.shared
    let dataTask = session.dataTask(with: url!) { (data, response, error) in

        // If there are no errors and there is data
        if error == nil && data != nil {
            do {
                // Decode JSON data into Structs
                let result = try JSONDecoder().decode(ArticleService.self, from: data!)

                // Do this on the main thread
                DispatchQueue.main.async {
                    self.delegate?.articlesRetrieved(result.articles!)
                }
            }
            catch {
                print("Could not decode data. \(error)")
                return
            }
        }
    }
    dataTask.resume()
}
}

JSON：

{
    "status": "ok",
    "totalResults": 10,
    -"articles": [
    -{
    -"source": {
    "id": "techcrunch",
    "name": "TechCrunch"
    },
    "author": "Kirsten Korosec",
    "title": "Waymo and Lyft partner to scale self-driving robotaxi service in Phoenix",
    "description": "Waymo is partnering with Lyft to bring self-driving vehicles onto the ride-hailing network in Phoenix as the company ramps up its commercial robotaxi service. Waymo will add 10 of its self-driving vehicles on Lyft platform over the next few months, according …",
    "url": "https://techcrunch.com/2019/05/07/waymo-and-lyft-partner-to-scale-self-driving-robotaxi-service-in-phoenix/",
    "urlToImage": "https://techcrunch.com/wp-content/uploads/2017/09/waymo_minivan_7.jpg?w=600",
    "publishedAt": "2019-05-07T20:42:20Z",
    "content": "Waymo is partnering with Lyft to bring self-driving vehicles onto the ride-hailing network in Phoenix as the company ramps up its commercial robotaxi service.\r\nWaymo will add 10 of its self-driving vehicles on Lyft platform over the next few months, according… [+1387 chars]"
}

当我在模型类中运行JSONDecoder（）时，它捕获到一条错误消息：

typeMismatch（Swift.Double，Swift.DecodingError.Context（codingPath：[CodingKeys（stringValue：“ articles”，intValue：nil），_JSONKey（stringValue：“ Index 0”，intValue：0），CodingKeys（stringValue：“ PublishedAt”，intValue：nil）]，debugDescription：“预期对Double进行解码，但找到了一个字符串/数据。”，底层错误：nil））

想知道是否有人之前曾遇到此错误，或者可以给我一些见识？

尝试使用JSONDecoder（），但无法解析JSON

0 个答案: