landmark.swift

    //Attempting to load the view of a view controller while it is deallocating 
    //is not allowed and may result in undefined behavior (<UIAlertController: 0x7f8ec04a27a0>)
    //(wait alert is the one that it is complaining about)
    
    @IBAction func addLandmarkWithSelectedType() {
        let waitAlert = UIAlertController(title: "Waiting for accuracy", message: "Holding until the accuracy improves", preferredStyle: .Alert)
        let timeoutAlert = UIAlertController(title: "Location Manager Error!", message: "Location manager was not able to provide the necessary accuracy", preferredStyle: .Alert)
        
        let cancelTimeoutAlert = { (action: UIAlertAction) in self.dismissViewControllerAnimated(true, completion: nil) }
        timeoutAlert.addAction(UIAlertAction(title: "Drat", style: .Cancel, handler: cancelTimeoutAlert))
        let showTimeoutAlert = {
            self.presentViewController(timeoutAlert, animated: true, completion: nil)
        }
        
        let beginAddingLandmark = {
            if self.currentPickerType.isPointLandmark() {
                do {
                    try self.addPointLandmark(self.currentPickerType)
                } catch {
                    
                }
            } else {
                
            }
        }
        
        let completionHandler = { (timeout: Bool) in
            self.dismissViewControllerAnimated(true, completion: timeout ? showTimeoutAlert : beginAddingLandmark)
        }
        
        //only run the wait block if it is necessary
        if currentLocation?.horizontalAccuracy > desiredAccuracy {
            self.presentViewController(waitAlert, animated: true, completion: nil)
            waitFor(accuracy: desiredAccuracy, withTimeout: 5.0, completion: completionHandler)
        } else {
            beginAddingLandmark()
        }
    }