iOS-无法调用非功能类型“ NSProgress”的值

Question

I'm trying to download a file using Alamofire, with progress. But I get this error at the progress line.

Cannot call value of non-function type 'NSProgress'

What's the problem? All the examples I've seen, namely the official one , do the exact same thing!

Alamofire.download(.GET, nsurl!.absoluteString,     destination: { (temporaryURL, response) in
    return filepath
})
    .progress { (bytesRead, totalBytesRead, totalBytesExpectedToRead) in // <------ ERROR HERE
        dispatch_async(dispatch_get_main_queue(), {
            self.progressBar?.progress = totalBytesRead / totalBytesExpectedToRead
        })
    }
    .response { (request, response, _, error) in
        self.loadImageFromFile(filepath.absoluteString)
}

EDIT:

After @mvoelkl's suggestion, I added parenthesis to the progress function. But the result stayed the same:

Answer 1

This worked for me.

Alamofire.download(.GET, nsurl!.absoluteString, destination: { (temporaryURL, response) in
    return file path
})
    .progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
        let status = Float(totalBytesRead/totalBytesExpectedToRead)
        dispatch_async(dispatch_get_main_queue(), {
            self.progressBar?.progress = status
        })
    }
    .response { (request, response, _, error) in
        self.loadImageFromFile(filepath.absoluteString)
}

What may not work in the above is totalBytesExpectedToRead . It sometimes returns -1, so you may need plug the size of the file you are downloading without resorting to Alamofire.

Answer 2

For me the solution was to add Float around progress.fractionCompleted, so use it like this:

.uploadProgress{ progress in
    self.updateProgressBar(imagesToDo: images.count, prog: Float(progress.fractionCompleted))
}

thanks to: https://github.com/Alamofire/Alamofire/issues/1652#issuecomment-259020449

Answer 3

I hope this issue fix when update your Alamofire pod .

Here mention this issue :- https://github.com/SwiftyJSON/Alamofire-SwiftyJSON/issues/40

Answer 4

Had the same issue, fixed by using the following code:

Alamofire.upload(.PUT, url, file: file)
    .progress({ (bytesWritten, totalBytesWritten, totalBytesExpectedToWrite) in
        print("test")
    })

Mind the added parentheses for .progress(), found it by generating the code stub with Xcode. Seems there's a mistake in the documentation, if you can confirm this we should file an issue on GitHub ;)

Answer 5

This issue plagued me too. It was caused by an ambiguous issue with NSURLRequest.progress and Alamofire.Request.progress.

To fix the issue I modified Alamofire's source.

Open Alamofire/Request.swift (v3.4.x)

On line 141, rename the function to something that is not progress, I chose requestProgress.

From:

public func progress(closure: ((Int64, Int64, Int64) -> Void)? = nil) -> Self {

To:

public func requestProgress(closure: ((Int64, Int64, Int64) -> Void)? = nil) -> Self {

Proceed to use the function as before with no compiler issues.