如何在 Alamofire 4.0 中添加带有上传进度百分比的标签的进度条
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【中文标题】如何在 Alamofire 4.0 中添加带有上传进度百分比的标签的进度条【英文标题】：How I can add progress bar with label with percentage of progress of upload in Alamofire 4.0 【发布时间】：2016-12-31 12:01:18 【问题描述】：我正在尝试通过 Alamofire 4.0 将视频上传到服务器，我想添加进度条以显示上传过程中上传过程的百分比，我如何通过与 Alamofire 上传相同的功能来做到这一点。
我的上传功能代码：
Alamofire.upload(multipartFormData: multipartFormData in
multipartFormData.append(url.absoluteURL!, withName: "videoFile", fileName: "alaa", mimeType: "mov")
multipartFormData.append("video".data(using: .utf8)!, withName: "load")
multipartFormData.append("record".data(using: .utf8)!, withName: "type")
, with: URL, encodingCompletion: (result) in
// code
print("uploaded")
)
【问题讨论】：
【参考方案1】：直接引用 AlamoFire 文档：
上传进度
当您的用户等待上传完成时，有时它 可以方便地向用户显示上传进度。任何 UploadRequest 可以同时报告上传进度和下载进度 使用 uploadProgress 和 downloadProgress API 的响应数据。
let fileURL = Bundle.main.url(forResource: "video", withExtension: "mov")
Alamofire.upload(fileURL, to: "https://httpbin.org/post")
.uploadProgress progress in // main queue by default
print("Upload Progress: \(progress.fractionCompleted)")
.downloadProgress progress in // main queue by default
print("Download Progress: \(progress.fractionCompleted)")
.responseJSON response in
debugPrint(response)
【讨论】：
这一行视频的网址在哪里？ let fileURL = Bundle.main.url(forResource: "video", withExtension: "mov") 意思是在你的主包中获取一个名为 video.mov 的文件的 URL。 这是示例代码，而不是特定于您的问题的代码。该行为来自应用程序包的名为“video.mov”的文件创建了一个文件 url。 @DuncanC 你知道 downloadProgress 在这个例子中做了什么吗？找了一阵子，看了看AlamoFire的代码，想不通。是服务器响应的下载进度吗？【参考方案2】：请检查。
var imgData = Data()
if image != nil
imgData = UIImageJPEGRepresentation(image!, 1.0)!
Alamofire.upload(multipartFormData: multipartFormData in
multipartFormData.append(imgData, withName: "image", fileName: "imagefilename", mimeType: "image/jpeg")
for (key, value) in param
//let data = (value as! String).data(using: String.Encoding.utf8)!
let data = (value as AnyObject).data(using: String.Encoding.utf8.rawValue)
multipartFormData.append(data!, withName: key as! String)
,
usingThreshold:UInt64.init(),
to:fullLink,
method:.post,
headers:[:],
encodingCompletion: encodingResult in
switch encodingResult
case .success(let upload, _, _):
upload.uploadProgress progress in // main queue by default
print("Upload Progress: \(progress.fractionCompleted)")
upload.responseJSON response in
debugPrint(response)
if let TempresponseDict:NSDictionary = response.result.value as? NSDictionary
if (TempresponseDict.object(forKey: "response") as? String)?.caseInsensitiveCompare("success") == .orderedSame
CompletionHandler(true, TempresponseDict)
else
var statusCode = response.response?.statusCode
if let error = response.result.error as? AFError
statusCode = error._code // statusCode private
switch error
case .invalidURL(let url):
print("Invalid URL: \(url) - \(error.localizedDescription)")
case .parameterEncodingFailed(let reason):
print("Parameter encoding failed: \(error.localizedDescription)")
print("Failure Reason: \(reason)")
case .multipartEncodingFailed(let reason):
print("Multipart encoding failed: \(error.localizedDescription)")
print("Failure Reason: \(reason)")
case .responseValidationFailed(let reason):
print("Response validation failed: \(error.localizedDescription)")
print("Failure Reason: \(reason)")
switch reason
case .dataFileNil, .dataFileReadFailed:
print("Downloaded file could not be read")
case .missingContentType(let acceptableContentTypes):
print("Content Type Missing: \(acceptableContentTypes)")
case .unacceptableContentType(let acceptableContentTypes, let responseContentType):
print("Response content type: \(responseContentType) was unacceptable: \(acceptableContentTypes)")
case .unacceptableStatusCode(let code):
print("Response status code was unacceptable: \(code)")
statusCode = code
case .responseSerializationFailed(let reason):
print("Response serialization failed: \(error.localizedDescription)")
print("Failure Reason: \(reason)")
// statusCode = 3840 ???? maybe..
print("Underlying error: \(error.underlyingError)")
else if let error = response.result.error as? URLError
print("URLError occurred: \(error)")
else
print("Unknown error: \(response.result.error)")
print("\(statusCode)") // the status code
CompletionHandler(false, TempresponseDict)
else
CompletionHandler(false, NSDictionary())
case .failure(let encodingError):
print(encodingError)
CompletionHandler(false, NSDictionary())
)
【讨论】：
fullLink 我必须把它作为字符串或 urlrequest 因为在第二种情况下它给我 null 所以视频不会上传 ，这部分我不明白，如果我有 2 个参数，如上面的代码，我该如何处理。 for (key, value) in param //let data = (value as!String).data(using: String.Encoding.utf8)! let data = (value as AnyObject).data(using: String.Encoding.utf8.rawValue) multipartFormData.append(data!, withName: key as!String) fullLink = String for (key, value) in param //let data = (value as!String).data(using: String.Encoding.utf8)! let data = (value as AnyObject).data(using: String.Encoding.utf8.rawValue) multipartFormData.append(data!, withName: key as!String) 你的场景不需要这段代码。 您可以用您的数据将此行写入 2 次。 multipartFormData.append(imgData, withName: "image", fileName: "imagefilename", mimeType: "image/jpeg")以上是关于如何在 Alamofire 4.0 中添加带有上传进度百分比的标签的进度条的主要内容，如果未能解决你的问题，请参考以下文章