wait for response Alamofire swift

Question

I need to wait for response.response?.allHeaderFields data before executing function. I've searched the net and didn't quite get how to add "completion handler" to alamofire request. Or if there are any other ways to make the function wait.

@IBAction func comfirmation(sender: UIButton) {
    if CodeTextField.text != "" {
        print("in comfirmation function")
        let comfirmationRequestData = [
            "phone" : "\(appDelegate.savedNumber)",
            "code" : "\(CodeTextField.text!)"
        ]
        Alamofire.request(.POST,
            "http://192.168.214.241:4000/login",
            parameters: comfirmationRequestData,
            encoding: .JSON).responseJSON {
                response in
                switch response.result {
                case .Success:
                    let jsonDecrypted = JSON(response.result.value!)
                    print(jsonDecrypted)
                    let headerFile = response.response?.allHeaderFields as? [String:String]
                    print(headerFile)

                case .Failure(let error):
                    print(error)
                }
        }
        print("in comfirmation function. success")
        appDelegate.defaults.setValue(appDelegate.savedNumber, forKey: "phoneNumber")
    } else {
        print("in comfirmation function. failed")
    }

}

Answer 1

Use Alamofire like this

func postRequest( urlSuffix : String, params:[String : AnyObject]?, filterParams : [String]?, success: (response: AnyObject!) -> Void, failure: (error: NSError?) -> Void)
{
    Alamofire.request(.POST, webServicesURLPrefix + urlSuffix, parameters: params, encoding: .JSON, headers: self.headers)
    request?.responseJSON { response in
        switch response.result
        {
        case .Success:
            success(response: response.result.value)
        case .Failure(let error):
            failure(error: error)
        }
    }
}

Call the method from anywhere as

self.postRequest("do-registration.php", params: params, filterParams: nil, success: { (response) -> Void in
        self.afterResponse(response)
        }) { (error) -> Void in
            failure(error: error)
    }

OR you can write a saperate method which you will have to call after the completion.

func afterResponse(responseData : AnyObject)
{
    print("Done")
    print(responseData)
}

Answer 2

You can cause the operation to be synchronous, but in order to do that you are going to have to use a semaphore for that you set up prior to the Alamofire request, and that you then release within the completion handler. You will wait on the semaphore right after you initiate Alamo fire.