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身体上。

我通过图像选择器获取图像如下：

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

我的请求如下：

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。我不想用base 64格式编码。请帮助我。

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!)
}

然后在你的功能中你创建这样的身体：

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

Answer 2

Swift 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()
}

如果要添加任何标头，则可以通过urlRequest.setValue方法添加标头。

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

Answer 3

原帖： upload image to server using Alamofire Ekta Padaliya回答
使用AlamoFire上传图片
1。安装指南请遵循教程
https://github.com/Alamofire/Alamofire

使用的语言 Swift 4
2.导入AlamoFire库

import Alamofire

3。创建自定义方法。
（可以将其粘贴到UIViewController Extension /您的UIViewcontroller中作为新函数）

func uploadImage(img: UIImage){
    let ImageData = UIImagePNGRepresentation(img)
    let urlReq = "http://apiUrl.php"
    let parameters = ["user_id": "useridValue"]//you can comment this if not needed

    Alamofire.upload(multipartFormData: { multipartFormData in
        multipartFormData.append(ImageData!, withName: "shop_logo",fileName: "file.jpg", mimeType: "image/jpg")
        for (key, value) in parameters {// this will loop the 'parameters' value, you can comment this if not needed
            multipartFormData.append(value.data(using: String.Encoding.utf8)!, withName: key)
        }
    },
                     to:urlReq)
    { (result) in
        switch result {
        case .success(let upload, _, _):

            upload.uploadProgress(closure: { (progress) in
                print("Upload Progress: \(progress.fractionCompleted)")
            })

            upload.responseJSON { response in
                print(response.result.value)
                if let dic = response.result.value as? NSDictionary{
                    //do your action base on Api Return failed/success
                }
            }

        case .failure(let encodingError):
            print(encodingError)
        }
    }
}

调用这样的方法

self.uploadImage（img：image）

将图像上传到服务器 - Swift 3

3 个答案: