class Trans{
func getToken(username: String , password: String){
    Alamofire.request(.GET, "http://www.shafadoc.ir/api/DocApp/Token?value=" + username + ":" + password ,parameters:nil)
        .responseJSON{ response in
            if let json = response.result.value{
            }
    }
}
}

if !login_password.text!.isEmpty || !login_username.text!.isEmpty
    {
        var trans : Trans = Trans
        trans.getToken(login_username.text!, password: login_password.text!)
    }