Type does not conform to protocol 'URLRequestConvertible' with Alamofire

Question

Here's the code:

enum Router: URLRequestConvertible {
    //Error: Type 'Five100px.Router' does not conform to protocol 'URLRequestConvertible'

    static let baseURLString = "https://api.500px.com/v1"
    static let consumerKey = "MY_KEY"

    case PopularPhotos(Int)
    case PhotoInfo(Int, ImageSize)
    case Comments(Int, Int)

    var URLRequest: NSURLRequest {

        let (path, parameters) : (String, [String: AnyObject]) = {

            switch self {

            case .PopularPhotos(let page):
                let params = ["consumer_key": Router.consumerKey, "page": "\(page)", "feature": "popular", "rpp": "50", "include_store": "store_download", "include_status": "votes"]
                return ("/phtos", params)

            case .PhotoInfo(let photoID, let ImageSize):
                var params = ["consumer_key": Router.consumerKey, "image_size": "\(ImageSize.rawValue)"]
                return ("/photos/\(photoID)", params)

            case .Comments(let photoID, let commentsPage):
                var params = ["consumer_key": Router.consumerKey, "comments": "1", "comments_page": "\(commentsPage)"]
                return ("/photos/\(photoID)/comments", params)
            }
        }()

        let URL = NSURL(string: Router.baseURLString)
        let URLRequest = NSURLRequest(URL: URL!.URLByAppendingPathComponent(path))
        let encoding = Alamofire.ParameterEncoding.URL

        return encoding.encode(URLRequest, parameters: parameters).0
    }
}

I imported Alamofire and added this code, then comes the error. I wrote this code according to raywenderlich tutorial: http://www.raywenderlich.com/85080/beginning-alamofire-tutorial, which is written in Swift 1.2 while I use Swift 2.

Answer 1

You need to return an NSMutableURLRequest in the URLRequest property instead of an NSURLRequest. That will fix up the error.

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Update

In Swift 3 and Alamofire 4, you need to return a URLRequest from the new asURLRequest() method. For more details, please refer to our much more detailed README examples.

Answer 2

@cnoon's answer works for version 3, but if you're using Alamofire version 4+, you will have to implement:

func asURLRequest() throws -> URLRequest