Swift 通用和可重用 API 调用，如何解码包含通用类型的结构？

Question

我正在尝试编写一个通用的可重用 API 调用，它接受一个符合 Codable 协议的类型的参数。然后我打算将检索到的 JSON 解码为包含此通用参数类型的结构。我已将此结构命名为 NetworkResponse。

我对 Swift 比较陌生，所以非常感谢任何帮助！

// struct that will be used to decode JSON
struct NetworkResponse<T: Codable>: Codable {
        var data : T?
        var error: String
        var msg: String
}

// Example struct that would be passed to the NetworkResponse struct above
struct AuthTokens: Codable, Hashable {
        let access_token: String
        let refresh_token: String
}

// My attempt at a generic reusable POST api call
func request<T: Codable>(
        url: URL?,
        body: [String: AnyHashable],
        dataType: T.Type, // This argument would be the AuthTokens type (for example)
        completion: @escaping(Result<T, Error>) -> Void
    ) -> Void {
        guard let url = url else { return completion(.failure(APIError.invalidURL)) }
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.allHTTPHeaderFields = ["Content-Type": "application/json"]
        request.httpBody = try? JSONSerialization.data(withJSONObject: body, options: .fragmentsAllowed)
        
        // Error: "Type of expression is ambiguous without more context"
        let task = URLSession.shared.dataTask(with: request) { data, _, _ in
            guard let data = data else { return }
            do {
                // Error: "cannot find 'dataType' in scope"
                let result = try JSONDecoder().decode(NetworkResponse<dataType>.self, from: data)
                completion(.success(result))
            }
            catch { completion(.failure(APIError.parsingError)) }
        }
        task.resume()
    }