我正在进行.post API调用，我需要使用multipart / form-data。我知道如何使用JSON进行调用，但我不熟悉multipart / form-data。使用JSON，这是一个非常简单的电话。只需创建一个类型参数：
var parameters:Parameters = [:]
parameters["username"] = emailTextField.text!
parameters["password"] = passwordTextField.text!
Alamofire.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default, headers: headers).responseJSON { (response) in
//Code here
}
我们如何使用表单数据来编写它。最简单的方法是什么？我不需要上传任何文件或任何东西。我将要做的就是使用上面非常简单的项目拨打电话。使用表单数据最简洁的方法是什么？我确信这是一个非常基本的问题，我四处寻找有关堆栈溢出的帮助，但我只看到这用于更高级的文件调用。我只是想知道如何以最简单的方式做到这一点，因为它本质上是JSON调用的替代品。
答案 0 :(得分：0)
文档示例：
Alamofire.upload(
multipartFormData: { multipartFormData in
multipartFormData.append(unicornImageURL, withName: "unicorn")
multipartFormData.append(rainbowImageURL, withName: "rainbow")
},
to: "https://httpbin.org/post",
encodingCompletion: { encodingResult in
switch encodingResult {
case .success(let upload, _, _):
upload.responseJSON { response in
debugPrint(response)
}
case .failure(let encodingError):
print(encodingError)
}
}
)
该方法的完整说明（如果您需要设置标题。Source）：
/// Encodes `multipartFormData` using `encodingMemoryThreshold` with the default `SessionManager` and calls
/// `encodingCompletion` with new `UploadRequest` using the `url`, `method` and `headers`.
///
/// It is important to understand the memory implications of uploading `MultipartFormData`. If the cummulative
/// payload is small, encoding the data in-memory and directly uploading to a server is the by far the most
/// efficient approach. However, if the payload is too large, encoding the data in-memory could cause your app to
/// be terminated. Larger payloads must first be written to disk using input and output streams to keep the memory
/// footprint low, then the data can be uploaded as a stream from the resulting file. Streaming from disk MUST be
/// used for larger payloads such as video content.
///
/// The `encodingMemoryThreshold` parameter allows Alamofire to automatically determine whether to encode in-memory
/// or stream from disk. If the content length of the `MultipartFormData` is below the `encodingMemoryThreshold`,
/// encoding takes place in-memory. If the content length exceeds the threshold, the data is streamed to disk
/// during the encoding process. Then the result is uploaded as data or as a stream depending on which encoding
/// technique was used.
///
/// - parameter multipartFormData: The closure used to append body parts to the `MultipartFormData`.
/// - parameter encodingMemoryThreshold: The encoding memory threshold in bytes.
/// `multipartFormDataEncodingMemoryThreshold` by default.
/// - parameter url: The URL.
/// - parameter method: The HTTP method. `.post` by default.
/// - parameter headers: The HTTP headers. `nil` by default.
/// - parameter encodingCompletion: The closure called when the `MultipartFormData` encoding is complete.
public func upload(
multipartFormData: @escaping (MultipartFormData) -> Void,
usingThreshold encodingMemoryThreshold: UInt64 = SessionManager.multipartFormDataEncodingMemoryThreshold,
to url: URLConvertible,
method: HTTPMethod = .post,
headers: HTTPHeaders? = nil,
encodingCompletion: ((SessionManager.MultipartFormDataEncodingResult) -> Void)?)
答案 1 :(得分：0)
在swift 4和Alamofire 4.7中
multipart / form-data request
let email = emailTextField.text!
let password = passwordTextField.text!
Alamofire.upload(
multipartFormData: { multipartFormData in
multipartFormData.append((email.data(using: String.Encoding.utf8, allowLossyConversion: false))!, withName: "email")
multipartFormData.append((password.data(using: String.Encoding.utf8, allowLossyConversion: false))!, withName: "password")
},
to: url,
encodingCompletion: { encodingResult in
switch encodingResult {
case .success(let upload, _, _):
upload.responseData { response in
debugPrint(response)
}
case .failure(let encodingError):
print(encodingError)
}
}
)
答案 2 :(得分：0)
//MARK: Uploading Multiple Images/File with Parameters
static func uploadMultipleImageWithParamters(aryImage:NSArray,webserviceName:String,postDataDict: String?, completion:@escaping (_ IsSuccess:Bool,_ Response:Any,_ CheckInternet:String) -> Void)
{
if isInternetAvailable() == false
{
let Alert = Customalert()
Alert.msg(message: msgInternet)
completion(false,"",objNoInternet)
return
}
let parameters = self.convertToDictionary(text: postDataDict!)
if parameters == nil{
let Alert = Customalert()
Alert.msg(message: "Please Check you Json")
completion(false,"","")
return
}
Alamofire.upload(
multipartFormData: { multipartFormData in
for i in 0..<aryImage.count
{
let imageData = UIImagePNGRepresentation(aryImage.object(at: i) as! UIImage)
multipartFormData.append(imageData!, withName: "Photo\(i)", fileName: "\(Date().timeIntervalSince1970).jpeg", mimeType: "image/jpeg")
}
for (key, value) in parameters! {
if value is String
{
multipartFormData.append((value as AnyObject).data(using: String.Encoding.utf8.rawValue)!, withName: key)
}
else if value is NSDictionary
{
let dataExample: Data = NSKeyedArchiver.archivedData(withRootObject: value as! NSDictionary)
multipartFormData.append(dataExample, withName: key)
}else if value is NSArray
{
let objData = NSKeyedArchiver.archivedData(withRootObject: value as! NSArray)
multipartFormData.append(objData, withName: key)
}
}
},
to: baseURL + "\(webserviceName)",
encodingCompletion: { encodingResult in
switch encodingResult {
case .success(let upload, _, _):
upload.responseString { response in
debugPrint(response)
print(response)
completion(true,response.value!,"")
}
.uploadProgress { progress in // main queue by default
print("Upload Progress: \(progress.fractionCompleted)")
}
return
case .failure(let encodingError):
debugPrint(encodingError)
}
})
}