Alamofire.upload SwiftLint violation

Question

The code for uploading image with Alamofire triggers a SwiftLint violation. How can it be fixed?

Alamofire.upload(multipartFormData: { (multipartFormData) in

                multipartFormData.append(imageData, withName: "profileImage", fileName: "image.png", mimeType: "image/jpg")
            }, usingThreshold: UInt64.init(), to: requestURL, method: .post, headers: headers) { (result) in
                switch result {
                case .success(let upload, _, _):
                    upload.responseJSON { response in
                        if let error = response.error {
                            completionBlock(.failure(error as NSError))
                            return
                        }
                        completionBlock(.success(response))
                    }
                case .failure(let error):
                    completionBlock(.failure(error as NSError))
                }
            }

Multiple Closures with Trailing Closure Violation: Trailing closure syntax should not be used when passing more than one closure argument. (multiple_closures_with_trailing_closure)

Unrelated but why pass `UInt64.init()` instead of an actual value such as `0`? — rmaddy, Feb 27 '19 at 15:45

score 5 · Accepted Answer · edited Mar 01 '19 at 06:18

5

The error is telling you not to use trailing closure syntax when there is more than one closure parameter.

Alamofire.upload(multipartFormData: { (multipartFormData) in
    multipartFormData.append(imageData, withName: "profileImage", fileName: "image.png", mimeType: "image/jpg")
}, usingThreshold: UInt64.init(), to: requestURL, method: .post, headers: headers, encodingCompletion: { (result) in
    switch result {
    case .success(let upload, _, _):
        upload.responseJSON { response in
            if let error = response.error {
                completionBlock(.failure(error as NSError))
                return
            }
            completionBlock(.success(response))
        }
    case .failure(let error):
        completionBlock(.failure(error as NSError))
    }
})

edited Mar 01 '19 at 06:18

Luda

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answered Feb 27 '19 at 15:44

rmaddy

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I'm getting this error: Ambiguous reference to member 'upload(_:to:method:headers:)' – Luda Feb 27 '19 at 19:39
Did you add the `interceptor` parameter name? I think that’s right after looking at the documentation. – rmaddy Feb 27 '19 at 22:07
I've copy pasted your answer – Luda Feb 28 '19 at 08:16
Check the documentation and verify the name of the last parameter. – rmaddy Feb 28 '19 at 15:12
Checked. It was encodingCompletion. Now it works! Updated your answer and checked it as correct. Thank you! – Luda Mar 01 '19 at 06:19

Alamofire.upload SwiftLint violation

1 Answers1