alamofire-update-image

let group = dispatch_group_create()
let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
for index in 1...key{
        switch index {

        case 1:
            self.ImageUpload(url, ImageParams: imageparam, ImageData: self.imageData1,ReqToVar: "1")

        case 2:
            self.ImageUpload(url, ImageParams: imageparam, ImageData: self.imageData2,ReqToVar: "2")

        case 3:
            self.ImageUpload(url, ImageParams: imageparam, ImageData: self.imageData3,ReqToVar: "3")

        case 4:
            self.ImageUpload(url, ImageParams: imageparam, ImageData: self.imageData4,ReqToVar: "4")

        case 5:
            self.ImageUpload(url, ImageParams: imageparam, ImageData: self.imageData5,ReqToVar: "5")

        case 6:
            self.ImageUpload(url, ImageParams: imageparam, ImageData: self.imageData6,ReqToVar: "6")

        default:
            println("no image")
        }

}

//當 group 的 leave 次數等同於 enter 次數，GCD 會notify並執行這裡的closure
dispatch_group_notify(group, queue) { () -> Void in
    println("Final")
}

ImageUpload

func ImageUpload(UrlString:String,ImageParams:Dictionary<String, String>,ImageData:NSData,ReqToVar:String){
      //增加 group 的進入次數，group同上方宣告的group
      dispach_group_enter(group)

      var urlRequest = urlRequestWithComponents(UrlString, parameters: ImageParams, imageData: ImageData)
      var FileUrl:JSON!
          Alamofire.upload(urlRequest.0, urlRequest.1)
              .progress { (bytesWritten, totalBytesWritten, totalBytesExpectedToWrite) in
                  //                        println("\(totalBytesWritten) / \(totalBytesExpectedToWrite)")
              }
              .responseJSON { (request, response, data, error) in
                  //                        println("REQUEST \(request)")
                  //                        println("RESPONSE \(response)")
                  //                        println("JSON \(data)")
                  
                  var json = JSON(data!)
                  FileUrl = json["path"]
                  switch ReqToVar{
                  case "1":
                      self.ResponseImg1Url = FileUrl.string
                  case "2":
                      self.ResponseImg2Url = FileUrl.string
                  case "3":
                      self.ResponseImg3Url = FileUrl.string
                  case "4":
                      self.ResponseImg4Url = FileUrl.string
                  case "5":
                      self.ResponseImg5Url = FileUrl.string
                  case "6":
                      self.ResponseImg6Url = FileUrl.string

                  default:
                      println("no image")
                  }
                  println("url = \(FileUrl.string)")
                  //                        println("ERROR \(error)")
                //
                //減少 group 的進入次數
                dispach_group_leave(group)
          }
}