UIAlertController+Alert.swift

import UIKit

/// Syntax Swift 2.2

extension UIAlertController {
    
    class func showIndicatorAlert(viewController: UIViewController, message: String) {
        
        let alert: UIAlertController = self.init(title: nil, message: message, preferredStyle: .Alert)
        
        // Add Indicator
        let indicator = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
        indicator.center = CGPoint(x: 25, y: 30)
        alert.view.addSubview(indicator)
    
        dispatch_async(dispatch_get_main_queue(), {
            indicator.startAnimating()
            viewController.presentViewController(alert, animated: true, completion: nil)
        })
    }
}