IOS Core Animation Example Chapter 7

ex7-6.swift

//
//  ViewController.swift
//  animation76
//
//  Created by Sunny Cheung on 25/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet var layerView:UIView!
    @IBOutlet 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(50.0, 50.0, 100.0, 100.0)
        self.colorLayer.backgroundColor = UIColor.blueColor().CGColor
        
        // add a custom action
        var transition:CATransition = CATransition()
        transition.type = kCATransitionPush
        transition.subtype = kCATransitionFromLeft
        self.colorLayer.actions = ["backgroundColor" : transition]
        
        // add it to our view
        self.layerView.layer.addSublayer(self.colorLayer)
    }
    
    @IBAction func changeColor() {
        
        
        // 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.colorLayer.backgroundColor = UIColor(red: red, green: green, blue: blue, alpha: 1.0).CGColor
        
    }


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


}

ex7-7.swift

//
//  ViewController.swift
//  animation77
//
//  Created by Sunny Cheung on 25/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    
    var colorLayer:CALayer!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        self.colorLayer = CALayer()
        self.colorLayer.frame = CGRectMake(0, 0, 100, 100)
        self.colorLayer.position = CGPointMake(self.view.bounds.size.width / 2, self.view.bounds.size.height / 2)
        self.colorLayer.backgroundColor = UIColor.redColor().CGColor
        self.view.layer.addSublayer(self.colorLayer)
    }
    
    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
        
        // get the touch point
        var point:CGPoint = touches.anyObject()!.locationInView(self.view)
        
        // check if we've tapped the moving layer
        if (self.colorLayer.presentationLayer().hitTest(point) != nil) {
            
            // 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.colorLayer.backgroundColor = UIColor(red: red, green: green, blue: blue, alpha: 1.0).CGColor
            
        }
        else {
            CATransaction.begin()
            CATransaction.setAnimationDuration(4.0)
            self.colorLayer.position = point
            CATransaction.commit()
        }
    }

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


}

Ex7.1-3.swift

//
//  ViewController.swift
//  animation71
//
//  Created by Sunny Cheung on 24/10/14.
//  Copyright (c) 2014 khl. All rights reserved.
//

import UIKit
import QuartzCore

class ViewController: UIViewController {
    
    @IBOutlet var layerView:UIView!
    @IBOutlet 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(50.0, 50.0, 100.0, 100.0)
        self.colorLayer.backgroundColor = UIColor.blueColor().CGColor
        
        self.layerView.layer.addSublayer(self.colorLayer)
    }
    
    @IBAction func changeColor() {
        
        CATransaction.begin()
        CATransaction.setAnimationDuration(1.0)
        
        CATransaction.setCompletionBlock({
            var transform:CGAffineTransform = self.colorLayer.affineTransform()
            transform = CGAffineTransformRotate(transform, CGFloat(M_PI_4))
            self.colorLayer.setAffineTransform(transform)
        })
        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.colorLayer.backgroundColor = UIColor(red: red, green: green, blue: blue, alpha: 1.0).CGColor
        CATransaction.commit()
    }

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


}