swift动画练习

SwiftMotionPrototypeTips.swift

//
//  ViewController.swift
//  SwiftMotionPrototypeTips
//
//  @see http://mathewsanders.com/prototyping-iOS-iPhone-iPad-animations-in-swift/

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var sliderRectNum: UISlider!
    @IBOutlet weak var sliderCountLabel: UILabel!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        /*
        UIView.animateWithDuration(1.0, animations: {
            coloredSquare.backgroundColor = UIColor.redColor()
            coloredSquare.frame = CGRect(x: Int(screenWidth) - squareWidth, y: 120, width: squareWidth, height: squareHeight)
            }, completion: { finished in
        })
        */
        
        /*
        let options = UIViewAnimationOptions.TransitionCrossDissolve | UIViewAnimationOptions.Autoreverse | UIViewAnimationOptions.Repeat
        UIView.animateWithDuration(1.0, delay: 2, options: options, animations: {
            coloredSquare.backgroundColor = UIColor.redColor()
            coloredSquare.frame = CGRect(x: Int(screenWidth) - squareWidth, y: 120, width: squareWidth, height: squareHeight)
        }, completion: nil)
        */
    }
    
    func createRandomInt(start: Int, _ end: Int) -> Int
    {
        return Int(arc4random_uniform(UInt32(end - start))) + start
    }
    
    func createRGBColor(red: Int, _ green: Int, _ blue: Int) -> UIColor
    {
        return UIColor(red: CGFloat(red) / 0xFF, green: CGFloat(green) / 0xFF, blue: CGFloat(blue) / 0xFF, alpha: 1.0)
    }
    
    @IBAction func clickAnimatedBtn(sender: AnyObject) {
        for index in 0..<Int(sliderRectNum.value) {
            
            let squareWidth = createRandomInt(10, 50)
            let squareHeight = squareWidth
            
            let yPosition = createRandomInt(20, 120)
            println(yPosition)
            
            let coloredSquare = UIView()
            coloredSquare.backgroundColor = createRGBColor(255, 102, 0)

            coloredSquare.frame = CGRect(x: 0 - squareWidth, y: yPosition, width: squareWidth, height: squareHeight) //50 * 50 y轴坐标包含状态栏
            self.view.addSubview(coloredSquare)
            
            let screenRect = UIScreen.mainScreen().bounds //CGRect
            let screenWidth = screenRect.size.width  //CGFloat
            let screenHeight = screenRect.size.height  //CGFloat
            
            //typealias NSTimeInterval = Double
            let options = UIViewAnimationOptions.CurveLinear
            let delay = NSTimeInterval(900 + arc4random_uniform(100)) / 1000
            
            UIView.animateWithDuration(1.0, delay: delay, options: options, animations: {
                coloredSquare.backgroundColor = UIColor.redColor()
                coloredSquare.frame = CGRect(x: Int(screenWidth), y: yPosition, width: squareWidth, height: squareHeight)
                }, completion: { finished in
                    coloredSquare.removeFromSuperview()
            })
        }
    }
    
    @IBAction func sliderValueChange(sender: AnyObject) {
        sliderCountLabel.text = String(Int(sliderRectNum.value))
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

1. UIColor中关于r,g,b的取值范围均为0.0 - 1.0
2. NSTimeInterval即为Double类型的别名