Question

我正在尝试将从UIImagePickerController中选择的图像上传到我在AWS上托管的Web服务器。我正在关注本教程：https://www.udemy.com/swift-php-mysql-user-sign-up-sign-in-sign-out-and-more/learn/v4/overview，我收到了一堆Argument labels '(_:)' do not match any available overloads错误。我试过搜索这个错误，但我找不到任何与我当前代码有关的内容。我没有在教程中使用原始代码，我正在尝试将其转换为Swift3并使用以下答案：iOS swift NSMutableData has no member appendString来遵循最佳编码实践。这是我目前的代码：

func createBodyWithParameters(_ parameters: [String: String]?, filePathKey: String?, imageDataKey: Data, boundary: String) -> Data {
        var body = Data();

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

        let filename = "user-profile.jpg"

        let mimetype = "image/jpg"

        body.append(Data("--\(boundary)\r\n"))
        body.append(Data("Content-Disposition: form-data; name=\"\(filePathKey!)\"; filename=\"\(filename)\"\r\n"))
        body.append(Data("Content-Type: \(mimetype)\r\n\r\n"))
        body.append(imageDataKey)
        body.append(Data("\r\n"))



        body.append(Data("--\(boundary)--\r\n"))

        return body as Data
    }

有人可以解释我做错了什么吗？谢谢！

Answer 1

您不能像这样初始化数据：

Data("foo")

你能做的是：

Data("foo".utf8)

就像您提供的链接一样。（你错过了.utf8）

编辑：是的，那个人说他不想使用那个代码，但是听我说，这个版本的扩展不允许有损连接，只要你在字符串里面写任何东西，数据永远不会是零。

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

用法：

body.appendString("foo")

像这样初始化身体：

var body = NSMutableData()

像这样回归

return body as Data

Answer 2

试试这段代码。您可以使用此代码将图像上传到swift3中的网络服务器

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

func photoDataToFormData(parameters: [String: String]?, data: Data, boundary:String, fileName:String) -> Data
{
    var fullData = Data()

    if parameters != nil {
        for (key, value) in parameters! {

            print ("Key: \(key), Value: \(value)")
            let str = "--\(boundary)\r\n" + "Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n" + "\(value)\r\n"
            let data = str.data(using: String.Encoding.utf8, allowLossyConversion: true)

            fullData.append(data!)
        }
    }

    // 1 - Boundary should start with --
    let lineOne = "--" + boundary + "\r\n"
    fullData.append(lineOne.data(using: String.Encoding.utf8, allowLossyConversion: false)!)

    // 2
    let lineTwo = "Content-Disposition: form-data; name=\"image\"; filename=\"" + fileName + "\"\r\n"
    NSLog(lineTwo)
    fullData.append(lineTwo.data(using: String.Encoding.utf8, allowLossyConversion: false)!)

    // 3
    let lineThree = "Content-Type: image/jpg\r\n\r\n"
    fullData.append(lineThree.data(using: String.Encoding.utf8, allowLossyConversion: false)!)

    // 4
    fullData.append(data)

    // 5
    let lineFive = "\r\n"
    fullData.append(lineFive.data(using: String.Encoding.utf8, allowLossyConversion: false)!)

    // 6 - The end. Notice -- at the start and at the end
    let lineSix = "--" + boundary + "--\r\n"
    fullData.append(lineSix.data(using: String.Encoding.utf8, allowLossyConversion: false)!)
    return fullData
}

在上面的代码之后，你需要在Api函数中的任务之前调用一个函数。我在下面提到了这段代码。

 let imageData = UIImageJPEGRepresentation(profileImage.image!, 0.5)

 let boundary = generateBoundaryString()

 let fullData = photoDataToFormData(parameters: parameters as? [String : 
 String], data: imageData!, boundary: boundary, fileName: "Test.jpg")

 request.setValue("multipart/form-data; boundary=" + boundary, 
 forHTTPHeaderField: "Content-Type")

    // REQUIRED!
 request.setValue(String(fullData.count), forHTTPHeaderField: "Content-
 Length")

 request.httpBody = fullData

Answer 3

我通过在类ViewController之后添加以下行来解决swift 4中的这个问题：

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!)
    }
}

我的意思是类Viewcontroller在将ViewController添加到项目时创建的类。示例下一课：

   class ViewController2: UIViewController ,UINavigationControllerDelegate , UIImagePickerControllerDelegate{
      // my code
    }

swift3 - 将图像上传到网络服务器

3 个答案: