json - 嵌套 JSON Feed 返回错误

Question

我对 JSON feed 和 swift 4 总体来说是新手。我在从嵌套 JSON 源打印数据时遇到问题。首先，我不确定在 do 语句中是否正确调用了数组。其次，当我构建应用程序时，我收到以下长错误。有人能帮我破译这个吗？我的代码位于帖子底部。先感谢您。

2017-12-06 12:58:48.604154-0500 PlayerRankDOTA2[91584:6694163] [BoringSSL] Function boringssl_context_get_peer_sct_list: line 1754 received sct extension length is less than sct data length Error jsonErr dataCorrupted(Swift.DecodingError.Context(codingPath: [PlayerRankDOTA2.PlayerStatsParent.(CodingKeys in _053A446F694D6B16CE13A0E302B3B14A).rankings, Foundation.(_JSONKey in _12768CA107A31EF2DCE034FD75B541C9)(stringValue: "Index 0", intValue: Optional(0)), PlayerRankDOTA2.PlayerStats.(CodingKeys in _053A446F694D6B16CE13A0E302B3B14A).score], debugDescription: "Parsed JSON number <3099.96838722024> does not fit in Int.", underlyingError: nil))"

import UIKit

struct PlayerStatsParent:Decodable{
    let rankings: [PlayerStats]
}

struct PlayerStats:Decodable {
    let personaname: String
    let score: Int
    let solo_competitive_rank: Int
    let avatar: String
}

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let jsonUrlString = "https://api.opendota.com/api/rankings"
        guard let url = URL(string: jsonUrlString) else {return}
        URLSession.shared.dataTask(with: url) { (data, response, error)  in
            guard let data = data else {return}
            //let dataAsString = String(data: data, encoding: .utf8)
            //print(dataAsString)
            do{
                let playerStatsParent = try JSONDecoder().decode(PlayerStatsParent.self, from: data)
                print(playerStatsParent.rankings)
            } catch let jsonErr {
                print("Error jsonErr", jsonErr)
            }
        }.resume()
    }

    let jsonUrlString = "https://api.opendota.com/api/rankings"

}

Answer 1

您必须对 PlayerStats 进行多项更改。首先，score 必须为 Double，因为这是 API 返回的格式。其次，JSON 响应中的所有值都可以为 null。解决此问题的一种方法是将所有属性定义为可选属性。

struct PlayerStats:Decodable {
    let personaname: String?
    let score: Double?
    let solo_competitive_rank: Int?
    let avatar: String?
}

将 PlayerStats 结构更改为上述格式后，解码工作正常。