升级到 4.0 后 Alamofire 方法不起作用

Question

func downloadProgress(bytesRead: Int64, totalBytesRead: Int64,
    totalBytesExpectedToRead: Int64) {
    let percent = Float(totalBytesRead)/Float(totalBytesExpectedToRead)

    dispatch_async(dispatch_get_main_queue(), {
        self.progress.setProgress(percent,animated:true)   
    })
    print("Progress：\(percent*100)%")
}

func downloadResponse(request: NSURLRequest?, response: NSHTTPURLResponse?,
    data: NSData?, error:NSError?) {
    if let error = error {
        if error.code == NSURLErrorCancelled {
            self.cancelledData = data 
        } else {
            print("Failed to download file: \(response) \(error)")
        }
    } else {
        print("Successfully downloaded file: \(response)")
    }
}

@IBAction func continueBtnClick(sender: AnyObject) {
    if let cancelledData = self.cancelledData {
        self.downloadRequest = Alamofire.download(resumeData: cancelledData,
            destination: destination)

        self.downloadRequest.progress(downloadProgress) 

        self.downloadRequest.response(completionHandler: downloadResponse) 

        self.stopBtn.enabled = true
        self.continueBtn.enabled = false
    }
}

代码在 Alamofire 3.1 上运行良好，但在升级到 Swift 3.0 和 Alamofire 4.0 后无法运行。

以下两行显示错误“no such memeber fo progress”和“no such member of response”

1. self.downloadRequest.progress(downloadProgress)
2. self.downloadRequest.response(completionHandler: downloadResponse)

如何解决这两个问题？

谢谢。

Answer 1

您所指的功能在 Alamofire 4.0 中发生了变化。 “无成员”错误的原因是函数调用已更改。根据新文档，这是您应该（可能）进行的调用：

Alamofire.download("https://httpbin.org/image/png")
.downloadProgress { progress in
    print("Download Progress: \(progress.fractionCompleted)")
}
.responseData { response in
    if let data = response.result.value {
    }
}

根据 Xcode 的新功能（我也使用 Alamofire 4.0，但不使用 .Download）：

downloadRequest.downloadProgress(closure:  Request.ProgressHandler)
downloadRequest.responseData(completionHandler: (DownloadResponse<Data>) -> Void)

来源：Alamofire documentation for download progress