将图像上传到服务器 - Swift 3

Question

我想将图像作为参数与我的请求一起发送.我使用下面的代码来调用我的POST请求,但我不知道如何将图像附加到正文.

我通过图像选择器获取图像如下:

if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {

我的要求如下

var request = URLRequest(url: URL(string: "")!) // link removed
        request.httpMethod = "POST"
        let postString = "user_id=\(userId)&image=\(image)"
        request.httpBody = postString.data(using:.utf8)

        let task = URLSession.shared.dataTask(with: request) { data, response, error in
            guard let data = data, error == nil else {               // check for fundamental networking error
                return
            }
            do {
                let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? AnyObject

                if let parseJSON = json {
                    print("resp :\(parseJSON)")
                }
            } catch let error as NSError {
                print("error : \(error)")
            }
        }
        task.resume()

我是Swift的新手.我通过multipart/form-data看到了这个,但是我自己无法实现它.我不想以base 64格式对其进行编码.请帮帮我.

Answer 1

我使用以下结构发送图像:

func createRequestBodyWith(parameters:[String:NSObject], filePathKey:String, boundary:String) -> NSData{

    let body = NSMutableData()

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

    body.appendString(string: "--\(boundary)\r\n")

    var mimetype = "image/jpg"

    let defFileName = "yourImageName.jpg"

    let imageData = UIImageJPEGRepresentation(yourImage, 1)

    body.appendString(string: "Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(defFileName)\"\r\n")
    body.appendString(string: "Content-Type: \(mimetype)\r\n\r\n")
    body.append(imageData!)
    body.appendString(string: "\r\n")

    body.appendString(string: "--\(boundary)--\r\n")

    return body
}



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



extension NSMutableData {

func appendString(string: String) {
    let data = string.data(using: String.Encoding.utf8, allowLossyConversion: true)
    append(data!)
}

然后在你的函数中你创建这样的体:

request.httpBody = self.createRequestBodyWith(parameters:yourParamsDictionary, filePathKey:yourKey, boundary:self.generateBoundaryString)

Answer 2

斯威夫特 4.2

func uploadImage(paramName: String, fileName: String, image: UIImage) {
    let url = URL(string: "http://api-host-name/v1/api/uploadfile/single")

    // generate boundary string using a unique per-app string
    let boundary = UUID().uuidString

    let session = URLSession.shared

    // Set the URLRequest to POST and to the specified URL
    var urlRequest = URLRequest(url: url!)
    urlRequest.httpMethod = "POST"

    // Set Content-Type Header to multipart/form-data, this is equivalent to submitting form data with file upload in a web browser
    // And the boundary is also set here
    urlRequest.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")

    var data = Data()

    // Add the image data to the raw http request data
    data.append("\r\n--\(boundary)\r\n".data(using: .utf8)!)
    data.append("Content-Disposition: form-data; name=\"\(paramName)\"; filename=\"\(fileName)\"\r\n".data(using: .utf8)!)
    data.append("Content-Type: image/png\r\n\r\n".data(using: .utf8)!)
    data.append(image.pngData()!)

    data.append("\r\n--\(boundary)--\r\n".data(using: .utf8)!)

    // Send a POST request to the URL, with the data we created earlier
    session.uploadTask(with: urlRequest, from: data, completionHandler: { responseData, response, error in
        if error == nil {
            let jsonData = try? JSONSerialization.jsonObject(with: responseData!, options: .allowFragments)
            if let json = jsonData as? [String: Any] {
                print(json)
            }
        }
    }).resume()
}

如果您有任何标题要添加，您可以通过urlRequest.setValue方法添加它。

来源：https : //fluffy.es/upload-image-to-server/