Animation behaviors demo from Shanghai Cocoaheads

gistfile1.swift

//
//  ViewController.swift
//  BehaviorsDemo
//
//  Created by Saul Mora on 8/25/16.
//  Copyright © 2016 Magical Panda. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet var animations: [MoveInBehavior]?
    //  @IBOutlet var redBlock: UIView!
    
    //  lazy var moveIn: MoveInBehavior = {
    //    return MoveInBehavior(view: self.redBlock)
    //  }()
    
    //  override func viewDidLoad()
    //  {
    //    super.viewDidLoad()
    //
    //  }
    //
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        animations?.forEach { $0.prepare() }
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        animations?.forEach { $0.start() }
        
        
        //    let finalCenterPosition = redBlock.center
        //    let animations = { self.redBlock.center = finalCenterPosition }
        //
        //    let screen = UIScreen.mainScreen()
        //    redBlock.center = CGPoint(x: redBlock.center.x, y: screen.bounds.height)
        //    UIView.animateWithDuration(2, animations: animations)
    }
    
}

class Behavior: NSObject
{
    @IBOutlet var view: UIView!
    @IBInspectable var duration: Double = 2
    @IBInspectable var delay: Double = 0
    @IBInspectable var springDamping: CGFloat = 0
    @IBInspectable var initialSpringVelocity: CGFloat = 0
    
    @IBOutlet var nextAnimations: [Behavior]!
    
    var animations: Void -> Void = {}
    
    @IBAction func prepare()
    {
        nextAnimations?.forEach { $0.prepare() }
    }
    
    func animationsDidComplete(finished: Bool)
    {
        nextAnimations?.forEach {
            $0.prepare()
            $0.start()
        }
    }
    
    @IBAction func start()
    {
        UIView.animateWithDuration(duration,
                                   delay: delay,
                                   usingSpringWithDamping: springDamping,
                                   initialSpringVelocity: initialSpringVelocity,
                                   options: [],
                                   animations: animations,
                                   completion: animationsDidComplete)
    }
}

class FadeOutBehavior: Behavior
{
    override func prepare()
    {
        view.alpha = 1
        animations = { self.view.alpha = 0 }
    }
    
    override func start()
    {
        UIView.animateWithDuration(duration, animations: animations)
    }
}

class MoveInBehavior: Behavior
{
    @IBAction override func prepare()
    {
        super.prepare()
        
        let screen = UIScreen.mainScreen()
        let finalPosition = view.center
        view.center = CGPoint(x: view.center.x, y: screen.bounds.height)
        animations = { self.view.center = finalPosition }
    }
}