Not getting callbacks of delegate methods in NSObject class ios swift

Question

-- Usage of class is mentioned in top of class file as a commented code.

-- This class is used to find user's location and after that from location country is fetched with google's API.

-- Did not get location callbacks in locationManager's delegate methods like "didUpdateLocations" even if i wrote "locationManager.delegate = self".

-- Please check below code. I need help guyz to find out what wet wrong. If this type of configuration not possible then please suggest me alternative code block to replace below code.

    import UIKit
    import CoreLocation

class GetCountryCode: NSObject, CLLocationManagerDelegate {

// Usage of class
/*let getCountryeCode = GetCountryCode()

getCountryeCode.createLocationRequest({ (response) -> Void in
print("Response:\(response)")

})*/

typealias CompletionHandler = (countryCode:String) -> Void

var completionHandler: CompletionHandler?

private var locationManager: CLLocationManager?


func createLocationRequest(completionHandler: CompletionHandler){
    self.completionHandler = completionHandler

    locationManager = CLLocationManager()
    locationManager!.delegate = self
    locationManager!.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
    locationManager!.distanceFilter = 10
    locationManager!.requestWhenInUseAuthorization()
    locationManager!.startUpdatingLocation()
}

func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
    print("Error while updating location " + error.localizedDescription)
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

    let locationArray = locations as NSArray
    let locationObj = locationArray.lastObject as! CLLocation


    locationManager!.stopUpdatingLocation()
    locationManager!.stopMonitoringSignificantLocationChanges()



    executeProcess(self.completionHandler!, location: locationObj)

    locationManager!.delegate = nil
}

func executeProcess(completionHandler: CompletionHandler, location:CLLocation) {

    let latitude = location.coordinate.latitude.description
    let longitude = location.coordinate.longitude.description

    let request = NSMutableURLRequest(URL: NSURL(string: CommonUtils.google_geoCode_url + "?latlng=\(latitude),\(longitude)&key=\(CommonUtils.google_server_key)")!)
    let session = NSURLSession.sharedSession()
    request.HTTPMethod = "GET"

    print("CountryCodeURL:\(request.URL)")
    let task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
        if(data==nil){
            // self.buildErrorOnSignIn()
        }else{
            self.parseResponse(data!, completionHandler: completionHandler)
        }
    })

    task.resume()

}

func parseResponse(data:NSData, completionHandler: CompletionHandler){

    let dict: NSDictionary!=(try! NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers)) as! NSDictionary

    let status_str=dict.valueForKey("status") as! NSString

    if(status_str != "OK" || dict.valueForKey("results") == nil){

        dispatch_async(dispatch_get_main_queue()) {
            completionHandler(countryCode: "")
        }

        return;
    }

    let results_arr = dict.valueForKey("results") as! NSArray


    if(results_arr.count > 0){
        var countryCode_temp = ""

        var isCountryCodeMatch = false
        for i in 0 ..< results_arr.count{
            let addressComponents = results_arr[i].valueForKey("address_components")
            if(addressComponents != nil){
                let addressComponents_arr = addressComponents as! NSArray
                for j in 0 ..< addressComponents_arr.count {
                    let types_arr = addressComponents_arr[j].valueForKey("types") as! NSArray

                    for k in 0 ..< types_arr.count {
                        let type = String(types_arr.objectAtIndex(k))
                        if(type == "country"){
                            countryCode_temp = String(addressComponents_arr[j].valueForKey("short_name")!)
                            isCountryCodeMatch = true
                            break
                        }
                    }

                    if(isCountryCodeMatch == true){
                        break
                    }

                }

                if(isCountryCodeMatch == true){
                    break
                }
            }
        }
        print("countryCode_temp::\(countryCode_temp)")

        dispatch_async(dispatch_get_main_queue()) {
            completionHandler(countryCode: countryCode_temp)
        }
    }else{
        dispatch_async(dispatch_get_main_queue()) {
            completionHandler(countryCode: "")
        }
    }
}
    }


   // Usage of class
   /*let getCountryeCode = GetCountryCode()

   getCountryeCode.createLocationRequest({ (response) -> Void in
   print("Response:\(response)")

   })*/

Answer 1

I think instance of your class GetCountryCode is deallocated before delegate method called. Store that instance of GetCountryCode after you created it.