如何使用Alamofire Router来组织API调用？(swift Alamofire5)

Question

我想把我的 AF请求 到 路由器 结构，使项目更简洁。我收到一个错误信息

协议类型'Any'的值不能符合'Encodable'；只有structenumclass类型才能符合协议。

请帮我修正一下代码。THANK YOU!

我的URL将有一个占位符为 帐号 和 密码 将被送入 body. 答复将是： Bool (success), username and bearer token.

下面是我的 AF请求:

let username = usernameTextField.text
let password = passwordTextField.text
let loginParams = ["password":"\(password)"]

AF.request("https://example.com/users/\(username)/login", 
            method: .post, 
            parameters: loginParams, 
            encoder: JSONParameterEncoder.default, 
            headers: nil, interceptor: nil).response { response in

                switch response.result {
                case .success:
                    if let data = response.data {

                        do {
                            let userLogin = try JSONDecoder().decode(UsersLogin.self, from: data)

                            if userLogin.success == true {
                                defaults.set(username, forKey: "username")
                                defaults.set(password, forKey: "password")
                                defaults.set(userLogin.token, forKey: "token")
                                print("Successfully get token.")

                            } else {
                                //show alert
                                print("Failed to get token with incorrect login info.")
                            }
                        } catch {
                            print("Error: \(error)")
                        }
                    }

                case .failure(let error):
                    //show alert
                    print("Failed to get token.")
                    print(error.errorDescription as Any)
                }
            }

到目前为止，我有什么可以转换为 AF路由器 结构。

import Foundation
import Alamofire

enum Router: URLRequestConvertible {
    case login(username: String, password: String)

    var method: HTTPMethod {
        switch self {
        case .login:
            return .post
        }
    }

    var path: String {
        switch self {
        case .login(let username):
            return "/users/\(username)/login"
        }
    }

    var parameters: Parameters? {
        switch self {
        case .login(let password):
            return ["password": password]

        }
    }

    // MARK: - URLRequestConvertible
    func asURLRequest() throws -> URLRequest {
        let url = try Constants.ProductionServer.baseURL.asURL()
        var request = URLRequest(url: url.appendingPathComponent(path))

        // HTTP Method
        request.httpMethod = method.rawValue

        // Common Headers
        request.setValue(ContentType.json.rawValue, forHTTPHeaderField: HTTPHeaderField.acceptType.rawValue)
        request.setValue(ContentType.json.rawValue, forHTTPHeaderField: HTTPHeaderField.contentType.rawValue)

        // Parameters
        switch self {
        case .login(let password):
            request = try JSONParameterEncoder().encode(parameters, into: request) //where I got the error
        }

        return request
    }
}

class APIClient {
        static func login(password: String, username: String, completion: @escaping (Result<UsersLogin, AFError>) -> Void) {
            AF.request(Router.login(username: username, password: password)).responseDecodable { (response: DataResponse<UsersLogin, AFError>) in
                completion(response.result)
            }
        }
    }

LoginViewController 类(我替换了AF.request代码)

APIClient.login(password: password, username: username) { result in
                    switch result {
                    case .success(let user):
                        print(user)
                    case .failure(let error):
                        print(error.localizedDescription)
                    }

可编码 UsersLogin 模型

struct UsersLogin: Codable {
    let success: Bool
    let username: String
    let token: String?

    enum CodingKeys: String, CodingKey {
        case success = "success"
        case username = "username"
        case token = "token"
    }
}

Answer 1

你不能使用 Parameters 词典中带有 Encodable 类型的字典，作为 [String: Encodable] 不是 Encodable，就像错误说的那样。我建议把这一步移到 asURLRequest 流程中的一个单独的函数，比如。

func encodeParameters(into request: inout URLRequest) {
    switch self {
    case let .login(parameters):
        request = try JSONParameterEncoder().encode(parameters, into: request)
    }
}

不幸的是，对于有很多路由的路由器来说，这并不能很好地扩展， 所以我通常把我的路由分解成小的枚举， 然后把我的参数移到单独的类型中， 再和路由器结合起来，从而产生 URLRequest.

Answer 2

我花了点时间，但终于把它修好了。我也清理了一下代码。

enum Router: URLRequestConvertible {
    case login([String: String], String) 

    var baseURL: URL {
        return URL(string: "https://example.com")!
    }

    var method: HTTPMethod {
        switch self {
        case .login:
            return .post
        }
    }

    var path: String {
        switch self {
        case .login(_, let username):
            return "/users/\(username)/login"
        }
    }

    func asURLRequest() throws -> URLRequest {
        print(path)
        let urlString = baseURL.appendingPathComponent(path).absoluteString.removingPercentEncoding!
        let url = URL(string: urlString)
        var request = URLRequest(url: url!)
        request.method = method

        switch self {
        case let .login(parameters, _):
            request = try JSONParameterEncoder().encode(parameters, into: request)
        }

        return request
    }
}

使用方法

let username = usernameTextField.text

AF.request(Router.login(["password": password], username)).responseDecodable(of: UsersLogin.self) { (response) in

   if let userLogin = response.value {
      switch userLogin.success {
      case true:
           print("Successfully get token.")
      case false:
           print("Failed to get token with incorrect login info.")
      }
   } else {
      print("Failed to get token.")
   }
}