如果你不想要在创造复杂请求的杂草中迷失了方向，像 Alamofire 这样的第三方图书馆会很聪明。它与AFNetworking的作者相同，但它是一个原生的Swift库。

If you don't want to get lost in the weeds of creating complex requests, a third party library like Alamofire would be smart. It's by the same author as AFNetworking, but it's a native Swift library.

因此，Alamofire的实现可能如下所示：

So, an Alamofire implementation might look like:

func performRequest(urlString: String, id: String, uuid: String, text: String, title: String, blogAttributedText: NSAttributedString, image: UIImage) {

    let parameters = [
        "id" : id,
        "uuid" : uuid,
        "Text" : text,
        "Title" : title
    ]

    let imageData = UIImageJPEGRepresentation(image, 0.5)!

    let blogData = NSKeyedArchiver.archivedData(withRootObject: blogAttributedText)

    Alamofire.upload(
        multipartFormData: { multipartFormData in
            for (key, value) in parameters {
                if let data = value.data(using: .utf8) {
                    multipartFormData.append(data, withName: key)
                }
            }
            multipartFormData.append(imageData, withName: "image", fileName: "image.jpg", mimeType: "image/jpeg")
            multipartFormData.append(blogData, withName: "blog", fileName: "blog.archive", mimeType: "application/octet-stream")
    },
    to: urlString,
    encodingCompletion: { encodingResult in
        switch encodingResult {
        case .success(let upload, _, _):
            upload
                .validate()
                .responseJSON { response in
                    switch response.result {
                    case .success(let value):
                        print("responseObject: \(value)")
                    case .failure(let responseError):
                        print("responseError: \(responseError)")
                    }
            }
        case .failure(let encodingError):
            print("encodingError: \(encodingError)")
        }
    })
}

如果你是我自己建立这个请求，我建议一些事情。首先，由于您要发送不同类型的文件，您可能需要一些好的类型来封装它：

If you're going to build this request yourself, I'd suggest a few things. First, since you're sending files of different types, you might want some nice type to encapsulate this:

struct FilePayload {
    let fieldname: String
    let filename: String
    let mimetype: String
    let payload: Data
}

我也不确定如何制作 image / txt mime类型。我可能会使用 application / octet-stream 来存档。

I'm also not sure what to make of the image/txt mime type. I'd probably use application/octet-stream for the archive.

无论如何，构建请求可以如下：

Anyway, the building of the request could be as follows:

/// Create request.
///
/// - Parameters:
///   - url:                The URL to where the post will be sent.
///   - id:                 The identifier of the entry
///   - uuid:               The UUID of the entry
///   - text:               The text.
///   - title:              The title.
///   - blogAttributedText: The attributed text of the blog entry.
///   - image:              The `UIImage` of the image to be included.
///
/// - Returns: The `URLRequest` that was created

func createRequest(url: URL, id: String, uuid: String, text: String, title: String, blogAttributedText: NSAttributedString, image: UIImage) -> URLRequest {
    let parameters = [
        "id" : id,
        "uuid" : uuid,
        "Text" : text,     // I find it curious to see uppercase field names (I'd use lowercase for consistency's sake, but use whatever your PHP is looking for)
        "Title" : title
    ]

    let boundary = "Boundary-\(NSUUID().uuidString)"

    var request = URLRequest(url: url)
    request.httpMethod = "POST"
    request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
    request.setValue("application/json", forHTTPHeaderField: "Accept")  // adjust if your response is not JSON

    // use whatever field name your PHP is looking for the image; I used `image`

    let imageData = UIImageJPEGRepresentation(image, 0.5)!
    let imagePayload = FilePayload(fieldname: "image", filename: "image.jpg", mimetype: "image/jpeg", payload: imageData)

    // again, use whatever field name your PHP is looking for the image; I used `blog`

    let blogData = NSKeyedArchiver.archivedData(withRootObject: blogAttributedText)
    let blogPayload = FilePayload(fieldname: "blog", filename: "blog.archive", mimetype: "application/octet-stream", payload: blogData)

    request.httpBody = createBody(with: parameters, files: [imagePayload, blogPayload], boundary: boundary)

    return request
}

/// Create body of the multipart/form-data request.
///
/// - Parameters:
///   - parameters: The optional dictionary containing keys and values to be passed to web service.
///   - files:      The list of files to be included in the request.
///   - boundary:   The `multipart/form-data` boundary
///
/// - Returns: The `Data` of the body of the request.

private func createBody(with parameters: [String: String]?, files: [FilePayload], boundary: String) -> Data {
    var body = Data()

    if parameters != nil {
        for (key, value) in parameters! {
            body.append("--\(boundary)\r\n")
            body.append("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n")
            body.append("\(value)\r\n")
        }
    }

    for file in files {
        body.append("--\(boundary)\r\n")
        body.append("Content-Disposition: form-data; name=\"\(file.fieldname)\"; filename=\"\(file.filename)\"\r\n")
        body.append("Content-Type: \(file.mimetype)\r\n\r\n")
        body.append(file.payload)
        body.append("\r\n")
    }

    body.append("--\(boundary)--\r\n")
    return body
}

/// Create boundary string for multipart/form-data request
///
/// - returns:            The boundary string that consists of "Boundary-" followed by a UUID string.

private func generateBoundaryString() -> String {
    return "Boundary-\(NSUUID().uuidString)"
}

其中

extension Data {

    /// Append string to Data
    ///
    /// Rather than littering my code with calls to `dataUsingEncoding` to convert strings to `Data`, and then add that data to the `Data`, this wraps it in a nice convenient little `Data` extension. This converts using UTF-8.
    ///
    /// - parameter string:       The string to be added to the mutable `Data`.

    mutating func append(_ string: String) {
        if let data = string.data(using: .utf8) {
            append(data)
        }
    }
}

显然这是Swift 3代码，所以我删除了 NSMutableData reference。

Clearly this was Swift 3 code, so I excised the NSMutableData reference.