Swift class for managing UIView animations

MNGViewExtensions.swift

//
//  MNGViewExtensions.swift
//  
//
//  Created by Tommie N. Carter, Jr., MBA on 10/30/15.
//  Copyright © 2015 MING Technology. All rights reserved.
//

import UIKit

extension UIView {
    func pauseAnimations() {

        let paused_time = self.layer.convertTime(CACurrentMediaTime(), fromLayer: nil)
        self.layer.speed = 0.0;
        self.layer.timeOffset = paused_time;
    }
    func resumeAnimations() {
        let paused_time = self.layer.timeOffset
        self.layer.speed = 1.0
        self.layer.timeOffset = 0.0
        self.layer.beginTime = 0.0
        
        let time_since_pause = self.layer.convertTime(CACurrentMediaTime(), fromLayer: nil) - paused_time
        self.layer.beginTime = time_since_pause;
    }
}