Core Animation demo

ViewController.swift

//
//  ViewController.swift
//  AnimDemo
//
//  Created by James Cash on 17-02-16.
//  Copyright © 2016 Occasionally Cogent. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let sublayer = CALayer()
        sublayer.frame = CGRect(x: 50, y: 100, width: 100, height: 100)
        sublayer.backgroundColor = UIColor.greenColor().CGColor
        self.view.layer.addSublayer(sublayer)

        sublayer.speed = 2

//        let posAnim = CABasicAnimation(keyPath: "position")
//        posAnim.fromValue = NSValue(CGPoint: CGPoint(x: 50, y: 100))
//        posAnim.toValue = NSValue(CGPoint: CGPoint(x: 100, y: 200))
//        posAnim.duration = 1.0
//        posAnim.autoreverses = true
//        posAnim.repeatCount = HUGE
//        sublayer.addAnimation(posAnim, forKey: "posAnim")

//        let yPosAnim = CABasicAnimation(keyPath: "position.y")
//        yPosAnim.fromValue = 100
//        yPosAnim.toValue = 200
//        yPosAnim.duration = 1.0
//        yPosAnim.autoreverses = true
//        yPosAnim.repeatCount = HUGE
//        sublayer.addAnimation(yPosAnim, forKey: "posAnim")

//        let colorAnim = CABasicAnimation(keyPath: "backgroundColor")
//        colorAnim.fromValue = UIColor.greenColor().CGColor
//        colorAnim.toValue = UIColor.redColor().CGColor
//        colorAnim.duration = 2.0
//        colorAnim.autoreverses = true
//        colorAnim.repeatCount = HUGE
//        sublayer.addAnimation(colorAnim, forKey: "colorAnim")
        let colorAnim = CAKeyframeAnimation(keyPath: "backgroundColor")
        colorAnim.values = [
            UIColor.greenColor().CGColor,
            UIColor.blueColor().CGColor,
            UIColor.redColor().CGColor
        ]
        colorAnim.keyTimes = [
            0,
            0.2,
            1
        ]
        colorAnim.duration = 2.0
        colorAnim.autoreverses = true
        colorAnim.repeatCount = HUGE
        sublayer.addAnimation(colorAnim, forKey: "colorAnim")

        let posPath = UIBezierPath()
        posPath.moveToPoint(CGPoint(x: 50, y: 100))
        posPath.addLineToPoint(CGPoint(x: 100, y: 200))
        posPath.addArcWithCenter(CGPoint(x: 150, y:150), radius: 50, startAngle: 1, endAngle: 3, clockwise: true)
        let posAnim = CAKeyframeAnimation(keyPath: "position")
        posAnim.path = posPath.CGPath
        posAnim.duration = 2.0
        posAnim.autoreverses = true
        posAnim.repeatCount = 2
        posAnim.delegate = self

        sublayer.addAnimation(posAnim, forKey: "pathAnim")

    }

    override func animationDidStart(anim: CAAnimation) {
        print("Started animation \(anim)")
    }

    override func animationDidStop(anim: CAAnimation, finished flag: Bool) {
        print("stoped animation \(anim)")
    }

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


}