IOS Core Animation Example Chapter 8

ex8-10.swift

//
//  ViewController.swift
//  animation810
//
//  Created by Sunny Cheung on 27/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet var containerView:UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        // create a path
        var bezierPath:UIBezierPath = UIBezierPath()
        bezierPath.moveToPoint(CGPointMake(0,150))
        bezierPath.addCurveToPoint(CGPointMake(300,150), controlPoint1: CGPointMake(75,0), controlPoint2: CGPointMake(225,300))
        
        // draw the path using a CAShapeLayer
        var pathLayer:CAShapeLayer = CAShapeLayer()
        pathLayer.path = bezierPath.CGPath
        pathLayer.fillColor = UIColor.clearColor().CGColor
        pathLayer.strokeColor = UIColor.redColor().CGColor
        pathLayer.lineWidth = 3.0
        self.containerView.layer.addSublayer(pathLayer)
        
        // add a colored layer
        var colorLayer:CALayer = CALayer()
        colorLayer.frame = CGRectMake(0,0,64,64)
        colorLayer.position = CGPointMake(0,150)
        colorLayer.backgroundColor = UIColor.greenColor().CGColor
        self.containerView.layer.addSublayer(colorLayer)
        
        // create the position animation
        var animation1:CAKeyframeAnimation = CAKeyframeAnimation()
        animation1.keyPath = "position"
        animation1.path = bezierPath.CGPath
        animation1.rotationMode = kCAAnimationRotateAuto
        
        // Create color animation
        var animation2:CABasicAnimation = CABasicAnimation()
        animation2.keyPath = "backgroundColor"
        animation2.toValue = UIColor.redColor().CGColor
        
        // create group animation
        var groupAnimation:CAAnimationGroup = CAAnimationGroup()
        groupAnimation.animations = [animation1, animation2]
        groupAnimation.duration = 4.0
        
        colorLayer.addAnimation(groupAnimation, forKey: nil)
        
    }

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


}

ex8-11.swift

//
//  ViewController.swift
//  animation811
//
//  Created by Sunny Cheung on 27/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet var imageView:UIImageView!
    var images:Array<UIImage>!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        // set up images
        self.images = [ UIImage(named: "Anchor.png")!,
            UIImage(named: "Cone.png")!,
            UIImage(named: "Igloo.png")!,
            self.imageView.image!] // UIImage(named: "Spaceship.png")
        // note: Image on storyboard will create different object?
    }
    
    @IBAction func switchImage() {
        //set up crossfade transistion
          var transition:CATransition = CATransition()
          transition.type = kCATransitionFade
        
        // apply transition to imageview backing layer
        self.imageView.layer.addAnimation(transition, forKey: nil)
        
        // cycle to next image
        var currentImage:UIImage = self.imageView.image!
       
        var index:Int = (self.images as NSArray).indexOfObjectIdenticalTo(currentImage)
        index = (index + 1) % self.images.count
        
        self.imageView.image = self.images[index]
        
    }

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


}

ex8-12.swift

//
//  AppDelegate.swift
//  animation812
//
//  Created by Sunny Cheung on 29/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UITabBarControllerDelegate {

    var window: UIWindow?
    var tabBarController:UITabBarController!


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        let viewController1:UIViewController = FirstViewController(nibName: "FirstViewController", bundle: nil)
        let viewController2:UIViewController = SecondViewController(nibName: "SecondViewController", bundle: nil)
        
        self.tabBarController = UITabBarController()
        self.tabBarController.viewControllers = [viewController1, viewController2]
        self.tabBarController.delegate = self
        self.window?.rootViewController = self.tabBarController
        self.window?.makeKeyAndVisible()
        return true
    }
    
    func tabBarController(tabBarController: UITabBarController, didSelectViewController viewController: UIViewController) {
        var transition:CATransition = CATransition()
        transition.type = kCATransitionFade
        self.tabBarController.view.layer.addAnimation(transition, forKey: nil)
    }


}

//
//  FirstViewController.swift
//  animation812
//
//  Created by Sunny Cheung on 29/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class FirstViewController : UIViewController {
        
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        self.title = NSLocalizedString("First", comment: "First")
        self.tabBarItem.image = UIImage(named: "first")
    }
    
    required init(coder aDecoder: NSCoder) {
        super.init(coder:aDecoder)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

//
//  SecondViewController.swift
//  animation812
//
//  Created by Sunny Cheung on 29/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//


import UIKit

class SecondViewController : UIViewController {
    
  
    
    override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        self.title = NSLocalizedString("Second", comment: "Second")
        self.tabBarItem.image = UIImage(named: "second")
    }
    
    required init(coder aDecoder: NSCoder) {
        super.init(coder:aDecoder)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

ex8-13.swift

//
//  ViewController.swift
//  animation813
//
//  Created by Sunny Cheung on 29/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet var imageView:UIImageView!
    var images:Array<UIImage>!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        self.images = [UIImage(named: "Anchor")!, UIImage(named:"Cone")!, UIImage(named:"Igloo")!, self.imageView.image!]
    }
    
    @IBAction func switchImage() {
        UIView.transitionWithView(self.imageView, duration: 1.0, options: UIViewAnimationOptions.TransitionFlipFromLeft, animations: {
                let currentImage:UIImage = self.imageView.image!
                var index:Int = (self.images as NSArray).indexOfObject(currentImage)
                index = (index + 1) % self.images.count
                self.imageView.image = self.images[index]
            }, completion: nil)
    }

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


}

ex8-14.swift

//
//  ViewController.swift
//  animation814
//
//  Created by Sunny Cheung on 29/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBAction func performTransition() {
        // preserve the current view snapshot
        UIGraphicsBeginImageContextWithOptions(CGSize(width: self.view.bounds.width, height:self.view.bounds.height), true, 0.0)
        self.view.layer.renderInContext(UIGraphicsGetCurrentContext())
        let coverImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()
        
        // insert snapshot view in front of this one
        let coverView:UIView = UIImageView(image: coverImage)
        coverView.frame = self.view.bounds
        self.view.addSubview(coverView)
        
        // update the view (we'll simply randomize the layer background color
        var red:CGFloat = CGFloat(arc4random()) / CGFloat(INT_MAX)
        var green:CGFloat = CGFloat(arc4random())/CGFloat(INT_MAX)
        var blue:CGFloat = CGFloat(arc4random())/CGFloat(INT_MAX)
        self.view.backgroundColor = UIColor(red: red, green: green, blue: blue, alpha: 1.0)
        
        // perform animation
        UIView.animateWithDuration(1.0, animations: {
            // scale, rotate and fade the view
            var transform:CGAffineTransform = CGAffineTransformMakeScale(0.01, 0.01)
            transform = CGAffineTransformRotate(transform, CGFloat( M_PI_2))
            coverView.transform = transform
            coverView.alpha = 0.0
                }, completion: {
                    (finished:Bool) in
                        // remover the cover view now we're finish with it
                        coverView.removeFromSuperview()
                
        })
        
        
        
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

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


}

ex8-15.swift

//
//  ViewController.swift
//  animation815
//
//  Created by Sunny Cheung on 29/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet var containerView:UIView!
    var shipLayer:CALayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        self.shipLayer = CALayer()
        self.shipLayer.frame = CGRectMake(0,0,128,128)
        self.shipLayer.position = CGPointMake(150,150)
        self.shipLayer.contents = UIImage(named:"Ship")?.CGImage
        self.containerView.layer.addSublayer(self.shipLayer)
        
    }
    
    @IBAction func start() {
        var animation:CABasicAnimation = CABasicAnimation()
        animation.keyPath = "transform.rotation"
        animation.duration = 2.0
        animation.byValue = M_PI * 2
        animation.delegate = self
        self.shipLayer.addAnimation(animation, forKey: "rotateAnimation")
        
    }
    
    @IBAction func stop() {
        self.shipLayer.removeAnimationForKey("rotateAnimation")
        
    }
    
    override func animationDidStop(anim: CAAnimation!, finished flag: Bool) {
        NSLog("The animation stopped (finished: %@", flag ? "YES": "NO")
    }
    
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

ex8-2.swift

//
//  ViewController.swift
//  animation82
//
//  Created by Sunny Cheung on 25/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet var layerView:UIView!
    var colorLayer:CALayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        // create sub layer
        self.colorLayer = CALayer()
        self.colorLayer.frame = CGRectMake(50.0, 50.0, 100.0, 100.0)
        self.colorLayer.backgroundColor = UIColor.blueColor().CGColor
        
        // add it to our view
        self.layerView.layer.addSublayer(self.colorLayer)
    }
    
    @IBAction func changeColor() {
        
        // create a new randow color
        var red:CGFloat = CGFloat(arc4random()) / CGFloat(INT_MAX)
        var green:CGFloat = CGFloat(arc4random())/CGFloat(INT_MAX)
        var blue:CGFloat = CGFloat(arc4random())/CGFloat(INT_MAX)
        var color:UIColor = UIColor(red: red, green: green, blue: blue, alpha: 1.0)
        
        // create a basic animation
        var animation:CABasicAnimation = CABasicAnimation()
        animation.keyPath = "backgroundColor"
        animation.toValue = color.CGColor
       
        // apple animation with snap back
        self.applyBasicAnimation(animation, layer: self.colorLayer);
    }
    
    
    func applyBasicAnimation(animation:CABasicAnimation, layer:CALayer) {
        
        // set the from value (using presentation layer if available)
        animation.fromValue = (layer.presentationLayer() ?? layer).valueForKeyPath(animation.keyPath)
        
        // update the property in advance
        // note: this approach will only work if toValue != nil
        CATransaction.begin()
        CATransaction.setDisableActions(true)
        layer.setValue(animation.toValue, forKey: animation.keyPath)
        CATransaction.commit()
        
        // apply animation to layer
        layer.addAnimation(animation, forKey: nil)
        
        
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    
}

ex8-3.swift

//
//  ViewController.swift
//  animation83
//
//  Created by Sunny Cheung on 25/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet var layerView:UIView!
    var colorLayer:CALayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        // create sublayer
        self.colorLayer = CALayer()
        self.colorLayer.frame = CGRectMake(50,50,100,100)
        self.colorLayer.backgroundColor = UIColor.blueColor().CGColor
        
        // add it to our view
        self.layerView.layer.addSublayer(self.colorLayer)
    }

    @IBAction func changeColor() {
        
        // create a new randow color
        var red:CGFloat = CGFloat(arc4random()) / CGFloat(INT_MAX)
        var green:CGFloat = CGFloat(arc4random())/CGFloat(INT_MAX)
        var blue:CGFloat = CGFloat(arc4random())/CGFloat(INT_MAX)
        var color:UIColor = UIColor(red: red, green: green, blue: blue, alpha: 1.0)
        
        // create a basic animation
        var animation:CABasicAnimation = CABasicAnimation()
        animation.keyPath = "backgroundColor"
        animation.toValue = color.CGColor
        animation.delegate = self
        
        // apple animation with snap back
        self.colorLayer.addAnimation(animation, forKey: nil)
    }
    
   override func animationDidStop(anim: CAAnimation, finished flag: Bool) {
        // set the backgroundColor Property to match animation toValue
        CATransaction.begin()
        CATransaction.setDisableActions(true)
        self.colorLayer.backgroundColor = (anim as CABasicAnimation).toValue as CGColor
        CATransaction.commit()
        
    }
    

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


}

ex8-4.swift

//
//  ViewController.swift
//  animation84
//
//  Created by Sunny Cheung on 25/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit
import QuartzCore

class ViewController: UIViewController {
    
    @IBOutlet var hourHand:UIImageView!
    @IBOutlet var minuteHand:UIImageView!
    @IBOutlet var secondHand:UIImageView!
    var timer:NSTimer!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        // adjust anchor points
        self.secondHand.layer.anchorPoint = CGPointMake(0.5,0.9)
        self.minuteHand.layer.anchorPoint = CGPointMake(0.5,0.9)
        self.hourHand.layer.anchorPoint = CGPointMake(0.5,0.9)
        
        // start timer 
        self.timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("tick"), userInfo: nil, repeats: true)
        
        // set initial hand positions
        self.updateHandsAnimated(false)
        
    }

    func tick() {
        self.updateHandsAnimated(true)
    }
    
    func updateHandsAnimated(animated:Bool) {
        // convert time to hours, minutes and seconds
        var calendar:NSCalendar! = NSCalendar(calendarIdentifier: NSGregorianCalendar)
        
        var units:NSCalendarUnit = .CalendarUnitHour | .CalendarUnitMinute | .CalendarUnitSecond
        
        
        var components: NSDateComponents = calendar.components(units, fromDate: NSDate())
        
        // calculate hour hand angle
        var hourAngle:CGFloat =  (CGFloat(components.hour) / 12.0) * CGFloat(M_PI) * 2.0
        
        // calculate minute hand angle
        var minuteAngle:CGFloat =  (CGFloat(components.minute) / 60.0) * CGFloat(M_PI) * 2.0
        
        // calculate second hand angle
        var secondAngle:CGFloat =  (CGFloat(components.second) / 60.0) * CGFloat(M_PI) * 2.0
        
            
        
        self.setAngle(hourAngle, handView: self.hourHand, animated: animated)
        self.setAngle(minuteAngle, handView: self.minuteHand, animated: animated)
        self.setAngle(secondAngle, handView: self.secondHand, animated: animated)
        
    }
    
    func setAngle(angle:CGFloat, handView:UIView, animated:Bool) {
        
        //generate transform
        var transform:CATransform3D = CATransform3DMakeRotation(angle, 0, 0, 1)
        
        if (animated) {
            var animation:CABasicAnimation = CABasicAnimation()
            animation.keyPath = "transform"
            animation.toValue = NSValue(CATransform3D: transform)
            animation.duration = 0.5
            animation.delegate = self
            animation.setValue(handView, forKey:"handView")
            handView.layer.addAnimation(animation, forKey: nil)
            
        }
        else {
            // set transform directly
            handView.layer.transform = transform
            
        }
        
    }
    
    override func animationDidStop(anim: CAAnimation!, finished flag: Bool) {
        var handView:UIView = anim.valueForKey("handView") as UIView
        handView.layer.transform = (anim as CABasicAnimation).toValue.CATransform3DValue
    }
    
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

ex8-6-7.swift

//
//  ViewController.swift
//  animation87
//
//  Created by Sunny Cheung on 26/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet var containerView:UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        // create a path
        var bezierPath:UIBezierPath = UIBezierPath()
        bezierPath.moveToPoint(CGPointMake(0,150))
        bezierPath.addCurveToPoint(CGPointMake(300,150), controlPoint1: CGPointMake(75,0), controlPoint2: CGPointMake(225,300))
        
        // draw the path using a CAShaperLayer
        var pathLayer:CAShapeLayer = CAShapeLayer()
        pathLayer.path = bezierPath.CGPath
        pathLayer.fillColor = UIColor.clearColor().CGColor
        pathLayer.strokeColor = UIColor.redColor().CGColor
        pathLayer.lineWidth = 3.0
        self.containerView.layer.addSublayer(pathLayer)
        
        // add the ship
        var shipLayer:CALayer = CALayer()
        shipLayer.frame = CGRectMake(0,0,64,64)
        shipLayer.position = CGPointMake(0,150)
        shipLayer.contents = UIImage(named: "Ship.png")!.CGImage
        self.containerView.layer.addSublayer(shipLayer)
        
        // create the keyframe animation
        var animation:CAKeyframeAnimation = CAKeyframeAnimation()
        animation.keyPath = "position"
        animation.duration = 4.0
        animation.path = bezierPath.CGPath
        animation.rotationMode = kCAAnimationRotateAuto
        shipLayer.addAnimation(animation, forKey: nil)
    }

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


}