func getCategories(){
    Alamofire.request(oS.uCategories).responseJSON { (response) in
        switch response.result {
        case .success:
            if let result = response.result.value{
                let responseJSONDictionary = result as! NSDictionary
                let Data = responseJSONDictionary.object(forKey: "Data")! as! NSArray

                print(Data)

            }
        case .failure(let error):
            print(error)
        }
    }
}

{
"Message": "Ok",
"IsError": false,
"Data": [
    {
        "cGuid": "641f42d7-dfa8-11e7-95da-ec086b0540b2",
        "cName": "Restaurant",
        "bActive": 1,
        "created_at": null,
        "updated_at": null
    },
    {
        "cGuid": "6e71b498-dfa8-11e7-95da-ec086b0540b2",
        "cName": "Doctores",
        "bActive": 1,
        "created_at": null,
        "updated_at": null
    }
]