ios - 如何在 Alamofire 4 中进行参数编码？

Question

无法理解 Alamofire 4 中的参数编码。在我使用 ParameterEncoding 枚举并执行如下操作之前:

Alamofire.ParameterEncoding.URL.encode(mutableURLRequest, parameters: nil).0

然而，这已被 ParameterEncoding protocol 取代:

public typealias Parameters = [String: Any]

public protocol ParameterEncoding {
    func encode(_ urlRequest: URLRequestConvertible, with parameters: Parameters?) throws -> URLRequest
}

我如何将它集成到我当前的代码中？如何对当前的 mutableURLRequest 进行编码？

编辑:

static func urlRequestWithComponents(urlString:String, parameters:Dictionary<String, Any>, data:Data?, contentType: ContentType, parameterName: String) -> (URLRequestConvertible, Data) {

        var urlRequest = URLRequest(url: URL(string: urlString)!)
        urlRequest.cachePolicy = .reloadIgnoringLocalCacheData
        urlRequest.httpMethod = Alamofire.HTTPMethod.post.rawValue
        let boundaryConstant = "multipart-boundary";
        let multipartContentType = "multipart/form-data;boundary="+boundaryConstant
        urlRequest.setValue(multipartContentType, forHTTPHeaderField: "Content-Type")

        // Create upload data to send
        var uploadData = Data()

        if data != nil {
            // Add multipart data
            uploadData.append("\r\n--\(boundaryConstant)\r\n".data(using: String.Encoding.utf8)!)
            if contentType == .Image_JPEG {
                uploadData.append("Content-Disposition: form-data; name=\"\(parameterName)\"; filename=\"file.jpeg\"\r\n".data(using: String.Encoding.utf8)!)
                uploadData.append("Content-Type: image/jpeg\r\n\r\n".data(using: String.Encoding.utf8)!)
            } else if contentType == .Audio {
                let dateFormatter = DateFormatter()
                dateFormatter.dateFormat = "MMyyyyddsshhmmA" // superset of OP's format
                let audioFileName = "recording-\(dateFormatter.string(from: Date())).mp4"
                uploadData.append("Content-Disposition: form-data; name=\"\(parameterName)\"; filename=\"\(audioFileName)\"\r\n".data(using: String.Encoding.utf8)!)
                uploadData.append("Content-Type: audio/mpeg\r\n\r\n".data(using: String.Encoding.utf8)!)
            }
            uploadData.append(data!)
        }

        // Add parameters
        for (key, value) in parameters {
            uploadData.append("\r\n--\(boundaryConstant)\r\n".data(using: String.Encoding.utf8)!)
            uploadData.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n\(value)".data(using: String.Encoding.utf8)!)
        }
        uploadData.append("\r\n--\(boundaryConstant)--\r\n".data(using: String.Encoding.utf8)!)

        // return URLRequestConvertible and Data
        return (urlRequest, uploadData)
    }

做请求时:

let urlRequest = urlRequestWithComponents(urlString: url, parameters: parameters, data: imageData, contentType: .Image_JPEG, parameterName: "question_img")


    alamoManager.upload(urlRequest.1, with: urlRequest.0).responseObject { (response: DataResponse<CustomResponse>) in

     //Some code
    }

Answer 1

您可以像这样执行一个简单的 Alamofire 请求。

import Alamofire
import AlamofireObjectMapper
import ObjectMapper

//
//

Alamofire.request("hello.com", method: .post, parameters: ["name": "alvin"], encoding: JSONEncoding.default, headers: nil).responseObject(completionHandler: { (response : DataResponse<YourModelHere>) in


 })

你可以看到我在这个请求中使用了JSONEncoding。您可以从其中任何一个中选择您的编码方式。

在JSONEncoding中

1. 默认

   Alamofire.request("https://httpbin.org/post", method: .post, parameters: parameters, encoding: JSONEncoding.default)

2. 漂亮的印花

   Alamofire.request("https://httpbin.org/post", method: .post, parameters: parameters, encoding: JSONEncoding.prettyPrinted)

并且在URLEncoding

1. 默认--

   Alamofire.request("https://httpbin.org/get", 参数:参数，编码:URLEncoding.default)

2. 依赖方法

   Alamofire.request("https://httpbin.org/get", parameters: parameters, encoding: URLEncoding(destination: .methodDependent))

3. 查询字符串

4. http正文

   Alamofire.request("https://httpbin.org/post", 参数:参数，编码:URLEncoding.httpBody)

然后像这样创建您自己的自定义编码。

public struct MyCusomEncoding: ParameterEncoding {

    public func encode(_ urlRequest: URLRequestConvertible, with parameters: Parameters?) throws -> URLRequest {

        var urlRequest = try urlRequest.asURLRequest()

        guard let parameters = parameters else { return urlRequest }

        do {

            let data = //

            // Do your custom stuff here, convert your parameters it into JSON, String, Something else or may be encrypted...

        urlRequest.httpBody = data

        } catch {
            throw AFError.parameterEncodingFailed(reason: .jsonEncodingFailed(error: error))
        }

        return urlRequest
    }
}

并且您可以在 Alamofire 请求中使用 MyCusomEncoding。