核心动画，图标抖动

//
//  ViewController.swift
//  图标抖动
//
//  Created by admin on 16/1/27.
//  Copyright © 2016年 jin. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    @IBAction func start(sender: AnyObject) {
        let animation = CAKeyframeAnimation(keyPath: "transform.rotation")
        // 设置path
        animation.values = [-CGFloat(M_PI * 0.1),CGFloat(M_PI * 0.1),-CGFloat(M_PI * 0.1)]
        // 设置重复次数
        animation.repeatCount = Float(CGFloat.max)
        self.imageView.layer.addAnimation(animation, forKey: "shark")
    }
    @IBAction func stop(sender: AnyObject) {
        // 停止动画
        self.imageView.layer.removeAnimationForKey("shark")
    }
}