loadingAnimation.swift

//
//  ViewController.swift
//  asyncalertview
//
//  Created by JungMin Ahn on 2015. 7. 12..
//  Copyright (c) 2015년 JungMin Ahn. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    var isTap = false

    override func viewDidLoad() {
        super.viewDidLoad()
        var taps = UITapGestureRecognizer(target: self, action: Selector("tapp"))
        self.view.gestureRecognizers = [taps]
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func tapp() {
        isTap = !isTap
        if isTap {
            LoadingHUD.show()
        }
        else {
            LoadingHUD.hide()
        }
    }
}

class LoadingHUD: NSObject {
    private static let sharedInstance = LoadingHUD()
    private var popupView: UIImageView?

    class func show() {
        let popupView = UIImageView(frame: CGRectMake(0, 0, 300, 300))
        popupView.backgroundColor = UIColor.blackColor()
        popupView.animationImages = LoadingHUD.getAnimationImageArray()
        popupView.animationDuration = 4.0
        popupView.animationRepeatCount = 0

        if let window = UIApplication.sharedApplication().keyWindow {
            window.addSubview(popupView)
            popupView.center = window.center
            popupView.startAnimating()
            sharedInstance.popupView?.removeFromSuperview()
            sharedInstance.popupView = popupView
        }
    }

    class func hide() {
        if let popupView = sharedInstance.popupView {
            popupView.stopAnimating()
            popupView.removeFromSuperview()
        }
    }

    private class func getAnimationImageArray() -> [UIImage] {
        var animationArray: [UIImage] = []
        animationArray.append(UIImage(named: "day_1")!)
        animationArray.append(UIImage(named: "day_2")!)
        animationArray.append(UIImage(named: "day_3")!)
        animationArray.append(UIImage(named: "day_4")!)

        return animationArray
    }
}