如何使用Swift Decodable协议解码嵌套的JSON结构？

另一种方法是创建一个与JSON紧密匹配的中间模型（借助于quicktype.io之类的工具），让Swift生成对它进行解码的方法，然后在最终数据模型中挑选所需的片段：

// snake_case to match the JSON and hence no need to write CodingKey enums / structfileprivate struct RawServerResponse: Decodable {    struct User: Decodable {        var user_name: String        var real_info: UserRealInfo    }    struct UserRealInfo: Decodable {        var full_name: String    }    struct Review: Decodable {        var count: Int    }    var id: Int    var user: User    var reviews_count: [Review]}struct ServerResponse: Decodable {    var id: String    var username: String    var fullName: String    var reviewCount: Int    init(from deprer: Deprer) throws {        let rawResponse = try RawServerResponse(from: deprer)        // Now you can pick items that are important to your data model,        // conveniently depred into a Swift structure        id = String(rawResponse.id)        username = rawResponse.user.user_name        fullName = rawResponse.user.real_info.full_name        reviewCount = rawResponse.reviews_count.first!.count    }}

如果

reviews_count