animation_example.swift

//
//  ViewController.swift
//  HelloAnimation
//
//  Created by JK on 19/04/2018.
//  Copyright © 2018 JK. All rights reserved.
//

import UIKit

class ViewController: UIViewController, UIDynamicAnimatorDelegate {
    @IBOutlet weak var imageView: UIImageView!
    @IBOutlet weak var button: UIButton!
    var animator : UIDynamicAnimator!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        animator = UIDynamicAnimator(referenceView: self.view)

        createDisplayLink()
    }

    @IBAction func buttonTouched(_ sender: Any) {
        imageView.animationImages = [ #imageLiteral(resourceName: "1.png"),#imageLiteral(resourceName: "2.png"),#imageLiteral(resourceName: "3.png"),#imageLiteral(resourceName: "4.png"),#imageLiteral(resourceName: "5.png") ]
        imageView.animationDuration = 0.5
        imageView.startAnimating()
        
        setDynamics()
        
        //------------ (80, 80)
        
        UIView.animate(withDuration: 1) { [unowned self] in
            //frame 속성 바꾸기
//            self.imageView.frame = CGRect(x: 10, y: 10, width: self.imageView.frame.size.width, height: self.imageView.frame.size.height)
            self.imageView.transform = CGAffineTransform.init(rotationAngle: 3.14/4.0)
            self.imageView.transform = CGAffineTransform.init(scaleX: 0.5, y: 0.5)
            self.imageView.transform = CGAffineTransform.identity
        }

    }
    
    func createDisplayLink() {
        let displaylink = CADisplayLink(target: self,
                                        selector: #selector(step))
        
        displaylink.add(to: .current,
                        forMode: .defaultRunLoopMode)
    }
    
    @objc func step(displaylink: CADisplayLink) {
        print(displaylink.timestamp)
    }
    
    
    func setDynamics() {
        
        let square = UIView(frame: CGRect(x: 110, y: 100, width: 100, height: 100))
        square.backgroundColor = UIColor.gray
        self.view.addSubview(square)
        
        let gravity = UIGravityBehavior(items: [square])
        animator.addBehavior(gravity)
        
        let barrier = UIView(frame: CGRect(x: 0, y: 300, width: 130, height: 20))
        barrier.backgroundColor = UIColor.red
        self.view.addSubview(barrier)
        
        let collision = UICollisionBehavior(items: [square])
        collision.translatesReferenceBoundsIntoBoundary = true
        animator.addBehavior(collision)
        
        let rightEdge = CGPoint(x: barrier.frame.origin.x + barrier.frame.size.width, y: barrier.frame.origin.y)
        collision.addBoundary(withIdentifier: "barrier" as NSString, from: barrier.frame.origin, to: rightEdge)
        animator.delegate = self
    }
}