Alamofire POST请求有进展

Question

我正在使用Alamofire进行POST请求.由于此POST请求可能需要一段时间,我想跟踪进度并将其显示为ProgressView.

Alamofire.request(.POST, ApiLink.create_post, parameters: parameters, encoding: .JSON)
        .progress { (bytesRead, totalBytesRead, totalBytesExpectedToRead) -> Void in
            println("ENTER .PROGRESSS")
            println("\(totalBytesRead) of \(totalBytesExpectedToRead)")                
            self.progressView.setProgress(Float(totalBytesRead) / Float(totalBytesExpectedToRead), animated: true)
        }
        .responseJSON { (_, _, mydata, _) in 
            println(mydata)
        }

但是,我注意到.progress块只在post请求结束后才被调用,而不是多次调用以实际跟踪进度. println("ENTER .PROGRESSS")只被调用一次(最后)

我如何使.progress与Alamofire.request POST一起使用？

另外:我的参数包括base64编码的图像字符串.我正在使用后端Ruby on Rails来处理图像.这个过程需要相当长的时间.

Answer 1

你可以做的是首先使用ParameterEncoding枚举来生成HTTPBody数据.然后,您可以将数据拉出并将其传递给Alamofire upload方法.这是相同功能的修改版本,可在操场中编译,而是使用该upload功能.

struct ApiLink {
    static let create_post = "/my/path/for/create/post"
}

let parameters: [String: AnyObject] = ["key": "value"] // Make sure this has your image as well

let mutableURLRequest = NSMutableURLRequest(URL: NSURL(string: ApiLink.create_post)!)
mutableURLRequest.HTTPMethod = Method.POST.rawValue

let encodedURLRequest = ParameterEncoding.JSON.encode(mutableURLRequest, parameters: parameters).0
let data = encodedURLRequest.HTTPBody!

let progressView = UIProgressView()

Alamofire.upload(mutableURLRequest, data)
         .progress { _, totalBytesRead, totalBytesExpectedToRead in
             println("ENTER .PROGRESSS")
             println("\(totalBytesRead) of \(totalBytesExpectedToRead)")
             progressView.setProgress(Float(totalBytesRead) / Float(totalBytesExpectedToRead), animated: true)
         }
         .responseJSON { _, _, mydata, _ in
             println(mydata)
         }

正如@mattt最初在上面的评论中提到的,这肯定会有进展更新.