custom indicator with center image

//
//  indicator.swift
//  mTaxi
//
//  Created by Saroj on 4/6/16.
//  Copyright © 2016 Saroj. All rights reserved.
//

import UIKit


class Indicator{
    
    let window:UIWindow? = (UIApplication.sharedApplication().delegate?.window)!
    var dimView:UIView?
    var imageView:UIImageView?
    var circleImageView:UIImageView?
    var spinnerSize:CGFloat = 80
    var centerImage:UIImage = UIImage(named: "loading_inner")!
    var circleImage:UIImage = UIImage(named: "loading")!
    var stableCircleView:UIView?
    var presentView:UIView?
    
    func startAnimating(){
        presentView = window!
        let rotationAnimation = CABasicAnimation(keyPath: "transform.rotation.z")
        rotationAnimation.fromValue = 0 * CGFloat(M_PI/180)
        rotationAnimation.toValue = 360 * CGFloat(M_PI/180)
        let innerAnimationDuration : CGFloat = 1.0
        rotationAnimation.duration = Double(innerAnimationDuration)
        rotationAnimation.repeatCount = HUGE
        circleImageView = UIImageView(frame: CGRectMake(presentView!.center.x - (spinnerSize) / 2 , presentView!.center.y - (spinnerSize) / 2, spinnerSize, spinnerSize))
        imageView = UIImageView(frame: CGRectMake(presentView!.center.x - (spinnerSize  - 5) / 2 , presentView!.center.y - (spinnerSize - 5) / 2, spinnerSize - 5, spinnerSize - 5))
        imageView!.image = centerImage
        circleImageView?.image = circleImage
        dimView = UIView(frame: (window?.frame)!)
        dimView?.backgroundColor = UIColor.blackColor()
        dimView?.alpha = 0.5
        presentView!.addSubview(dimView!)
        presentView!.addSubview(circleImageView!)
        presentView!.addSubview(imageView!)
        self.circleImageView?.layer.addAnimation(rotationAnimation, forKey: "rotateInner")
        
    }
    
    func stopAnimating(){
    dimView?.removeFromSuperview()
    circleImageView?.removeFromSuperview()
    imageView?.removeFromSuperview()
    }
}