使用 Swift 5 读取 Json 数组

Question

在我进行 api 调用后，我有一个以下 json

[{"breeds":
[{"weight":{"imperial":"7 - 14","metric":"3 - 6"},"id":"ebur","description":" Something ","child_friendly":4,}]
,"url":"https://cdn2.thecatapi.com/images/YOjBThApG.jpg","width":2838,"height":4518}]

如您所见，有嵌套数组和此 api 调用的输出 我想得到Id 和url。我就这样处理我的 dataTask 输出

let jsonResponse = try? JSONSerialization.jsonObject(with: data!, options: [])
guard let jsonArray = jsonResponse as? [[String: Any]] else {
                          return
                    }

所以我可以毫无问题地访问网址print(jsonArray[0]["url"])，我也可以访问jsonArray[0]["breeds"]。但是，我不能做jsonArray[0]["breeds"]["decription"] 或jsonArray[0]["breeds"]["id"]。因为我收到以下错误Value of type 'Any?' has no subscripts 我怀疑问题出在[[String: Any]]。我如何将我的 jsonResponse 转换更改为数组以获得调用的正确输出

Answer 1

你必须转换任何下标值

if let breeds = jsonArray.first?["breeds"] as? [[String:Any]],
   let description = breeds.first?["description"] as? String {
     print(description)
}

Answer 2

您应该使用Codable 并且可以使用Quicktype 轻松地从json 生成结构。

import Foundation

// MARK: - Parameters
struct Parameters: Codable {
    let breeds: [Breed]?
    let url: String?
    let width, height: Int?
}

// MARK: - Breed
struct Breed: Codable {
    let weight: Weight?
    let id, breedDescription: String?
    let childFriendly: Int?

    enum CodingKeys: String, CodingKey {
        case weight, id
        case breedDescription = "description"
        case childFriendly = "child_friendly"
    }
}

// MARK: - Weight
struct Weight: Codable {
    let imperial, metric: String?
}