Alamofire network router snippet

Alamofire+NetworkRouter.swift

import Alamofire

enum NetworkRouter: URLRequestConvertible {
    
    static let baseURLString = "xxx"
    
    case UserLogin(Int)
    
    var URLRequest: NSMutableURLRequest {
        
        let requestComponents : (path: String, parameters: [String: AnyObject]) = {
            let requestPath: String
            let requestParameters: [String : AnyObject]
            
            switch self {
            case .UserLogin (let userId):
                requestPath = "/xxx"
                requestParameters = ["xxx": userId]
            }
            
            return (requestPath, requestParameters)
        }()
        
        let URL = NSURL(string: NetworkRouter.baseURLString)
        let URLRequest = NSURLRequest(URL: URL!.URLByAppendingPathComponent(requestComponents.path))
        let encoding = Alamofire.ParameterEncoding.URL
        
        return encoding.encode(URLRequest, parameters: requestComponents.parameters).0
    }
}