Stanford CS193p iOS开发课程笔记(十)

作者: Dominic1992 | 来源:发表于2015-12-16 23:57 被阅读227次

2015年12月16日

Stanford CS193p第十一课 Unwind Segues, Alerts, Timers, View Animation. 第十二课 Dynamic Animation

Unwind

Unwind Segue不会像其他Segue一样创建一个新的MVC

Alerts/Action Sheets

如何添加Alerts/Action Sheets
1.创建button
2.调用UIAlertController
3.addAction
4.调用presentViewController显示Alerts/Action Sheets

这次在之前CassiniDEMO中加入了Alerts和Action Sheets.
点进Cassini后点击"Redeploy"弹出Action Sheets.
在Action Sheets中"Orbit Saturn"栏中实现了点击跳出Alerts的功能

Action Sheets.png

Alerts.png

StoryBoard.png

具体代码如下:

    @IBOutlet weak var redeploy: UIBarButtonItem!
    @IBAction func redeploy(sender: UIBarButtonItem) {
        //创建actionSheet
        let actionSheet = UIAlertController(title: "Redeploy", message: "Issue commands to Cassini'sguidance system.", preferredStyle: UIAlertControllerStyle.ActionSheet)
        //添加Action
        actionSheet.addAction(UIAlertAction(title: "Orbit Saturn", style: UIAlertActionStyle.Default, handler: { (action: UIAlertAction) -> Void in
            //此处实现了,点击Orbit Saturn后跳出Alert
            let alert1 = UIAlertController(title: "Login Required", message: "Please enter your Cassini guidance system...", preferredStyle: UIAlertControllerStyle.Alert)//创建Alert
            //添加Action
            alert1.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil))
            alert1.addAction(UIAlertAction(title: "Login", style: UIAlertActionStyle.Default, handler: nil))
            //给Alert添加一个TextField
            alert1.addTextFieldWithConfigurationHandler { (textField) in
                textField.placeholder = "Guidance System Password"
            }
            
            //显示TextField
            self.presentViewController(alert1, animated: true, completion: nil)
            
        }))
        
        
        actionSheet.addAction(UIAlertAction(title: "Explore Titan", style: UIAlertActionStyle.Default, handler: nil))
        
        actionSheet.addAction(UIAlertAction(title: "Closeup of Sun", style: UIAlertActionStyle.Destructive, handler: nil))
        
        actionSheet.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil))
        
        //以下三行代码用于iPad已POPover的形式显示ActionSheets.在iPhone上不需要
        actionSheet.modalPresentationStyle = .Popover
        let ppc = actionSheet.popoverPresentationController
        ppc?.barButtonItem = redeploy
        
        //显示actionSheet
        presentViewController(actionSheet, animated: true, completion: nil)
    }

Animation

iOS中动画的分类
1.UIView Animation(视图属性的动画)
2.Animation of View Controller transitions(viewController转场动画)
3.Core Animation
4.Dynamic Animation(基于物理引擎的动画)
UIView Animation
在其中我们主要能够使用三种属性,分别为:frame(意味着可移动);transform(意味着可旋转);alpha(意味着可改变透明度)
使用:class func animateWithDuration(durationL NSTimeInterval, delay: NSTimerInterval, options: UIViewAnimationOptions, animations: () -> Void, completion: ((finished: Bool) -> Void)?)

Example.png
UIViewAnimationOptions

UIViewAnimationOptions.png
Dynamic Animation
如何使用Dynamic Animation
1.创建UIDynamicAnimator实例 var animator = UIDynamicAnimator(referenceView: UIView)
2.添加UIDynamicBehaviors,如gravity,collisions等 let gravity = UIGravityBehavior() animation.addBehavior(gravity)
3.添加UIDynamicItem let item1: UIDynamicItem = ...// usually a UIView gravity.addItem(item1)
UIDynamicItem protocol

protocol UIDynamicItem {
     var bounds: CGRect { get } 
     var center: CGRect { get set }
     var transform: CGAffineTransform { get set } //用于旋转
}

Behaviors
1.UIGravityBehavior有两个重要属性var angle: CGFloat //重力的角度 var magnitude: CGFloat //重力加速度
2.UIAttachmentBehavior

UIAttachmentBehavior.png
3.UICollisionBehavior碰撞效果
UICollisionBehavior.png
4.UISnapBehavior震荡效果
5.UIPushBehavior把物体推向特定角度,速度恒定,可食一次性的效果,也可是持续效果
6.UIDynamicItemBehavior控制对象之间如何交互
UIDynamicItemBehavior.png
DropitDEMO

import UIKit

class dropitViewController: UIViewController,UIDynamicAnimatorDelegate {

    @IBOutlet weak var gameView: BezierPathsView!
    
    //创建DynamicAnimator
    lazy var animator: UIDynamicAnimator = {
        let lazilyCreatedDynamicAnimator = UIDynamicAnimator(referenceView: self.gameView)
        lazilyCreatedDynamicAnimator.delegate = self
        return lazilyCreatedDynamicAnimator
    }()
    
    //创建集成了三个Behavior的DropBehavior的实例
    var dropitBehavior = DropBehavior()
    
    var attachment: UIAttachmentBehavior? {
        willSet {
            animator.removeBehavior(attachment!)
            gameView.setPath(nil, named: PathNames.Attachment)
        }
        didSet {
            if attachment != nil {
                animator.addBehavior(attachment!)
                attachment?.action = { [unowned self] in
                    if let attacheView = self.attachment?.items.first as? UIView {
                        let path = UIBezierPath()
                        path.moveToPoint(self.attachment!.anchorPoint)
                        path.addLineToPoint(attacheView.center)
                        self.gameView.setPath(path, named: PathNames.Attachment)
                    }
                }
            }
        }
    }

    
    override func viewDidLoad() {
        super.viewDidLoad()
        animator.addBehavior(dropitBehavior)
    }
    
    struct PathNames {
        static let MiddleBarrier = "Middle Barrier"
        static let Attachment = "Attachment"
    }
    
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        let barrierSize = dropSize
        let barrierOrigin = CGPoint(x: gameView.bounds.midX - barrierSize.width / 2, y: gameView.bounds.midY - barrierSize.height / 2)
        //设置圆圈的边界
        let path = UIBezierPath(ovalInRect: CGRect(origin: barrierOrigin, size: barrierSize))
        dropitBehavior.addBarrier(path, named: PathNames.MiddleBarrier)
        
        gameView.setPath(path, named: PathNames.MiddleBarrier)
    }
    
    //UIDynamicAnimatorDelegate中的方法,当动画停止时
    func dynamicAnimatorDidPause(animator: UIDynamicAnimator) {
        removeCompletedRow()
    }
    
    
    var dropsPerRow = 10
    //设置方块的形状
    var dropSize: CGSize {
        let size = gameView.bounds.width / CGFloat(dropsPerRow)
        return CGSize(width: size, height: size)
    }

    //设置手势
    @IBAction func drop(sender: UITapGestureRecognizer) {
        drop()
    }
    
    var lastDroppedView: UIView?
    
    //掉落方法
    func drop() {
        //设置方块的初始位置及大小
        var frame = CGRect(origin: CGPointZero, size: dropSize)
        frame.origin.x = CGFloat.random(dropsPerRow) * dropSize.width
        
        //创建方块视图,并设置其颜色
        let dropView = UIView(frame: frame)
        dropView.backgroundColor = UIColor.random
        
        lastDroppedView = dropView
        
        dropitBehavior.addDrop(dropView)
    }
    
    
    @IBAction func grabDrop(sender: UIPanGestureRecognizer) {
        let gesturePoint = sender.locationInView(gameView)
        
        switch sender.state {
        case .Began:
            if let viewToAttachTo = lastDroppedView {
                attachment = UIAttachmentBehavior(item: viewToAttachTo, attachedToAnchor: gesturePoint)
                lastDroppedView = nil
            }
        case .Changed:
            attachment?.anchorPoint = gesturePoint
        case .Ended:
            attachment = nil
        default: break
        }
        
    }
    
    //当满行后消除方块
    func removeCompletedRow() {
        var dropsToRemove = [UIView]()
        var dropFrame = CGRect(x: 0, y: gameView.frame.maxY, width: dropSize.width, height: dropSize.height)
        
        repeat {
            dropFrame.origin.y -= dropSize.height
            dropFrame.origin.x = 0
            var dropsFound = [UIView]()
            var rowIsComplete = true
            for _ in 0 ..< dropsPerRow {
                if let hitView = gameView.hitTest(CGPoint(x: dropFrame.midX, y: dropFrame.midY), withEvent: nil) {
                    if hitView.superview == gameView {
                        dropsFound.append(hitView)
                    } else {
                        rowIsComplete = false
                    }
                }
                dropFrame.origin.x += dropSize.width            }
            if rowIsComplete {
                dropsToRemove += dropsFound
            }
        } while dropsToRemove.count == 0 && dropFrame.origin.y > 0
        
        for drop in dropsToRemove {
            dropitBehavior.removeDrop(drop)
        }
    }

}

private extension CGFloat {
    static func random(max:Int) -> CGFloat {
        return CGFloat(arc4random() % UInt32(max))
    }
}

private extension UIColor {
    class var random:UIColor {
        switch arc4random() % 5 {
        case 0: return UIColor.greenColor()
        case 1: return UIColor.blueColor()
        case 2: return UIColor.orangeColor()
        case 3: return UIColor.redColor()
        case 4: return UIColor.purpleColor()
        default: return UIColor.blackColor()
        }
    }
}

import UIKit

class dropitViewController: UIViewController,UIDynamicAnimatorDelegate {

    @IBOutlet weak var gameView: BezierPathsView!
    
    //创建DynamicAnimator
    lazy var animator: UIDynamicAnimator = {
        let lazilyCreatedDynamicAnimator = UIDynamicAnimator(referenceView: self.gameView)
        lazilyCreatedDynamicAnimator.delegate = self
        return lazilyCreatedDynamicAnimator
    }()
    
    //创建集成了三个Behavior的DropBehavior的实例
    var dropitBehavior = DropBehavior()
    
    var attachment: UIAttachmentBehavior? {
        willSet {
            animator.removeBehavior(attachment!)
            gameView.setPath(nil, named: PathNames.Attachment)
        }
        didSet {
            if attachment != nil {
                animator.addBehavior(attachment!)
                attachment?.action = { [unowned self] in
                    if let attacheView = self.attachment?.items.first as? UIView {
                        let path = UIBezierPath()
                        path.moveToPoint(self.attachment!.anchorPoint)
                        path.addLineToPoint(attacheView.center)
                        self.gameView.setPath(path, named: PathNames.Attachment)
                    }
                }
            }
        }
    }

    
    override func viewDidLoad() {
        super.viewDidLoad()
        animator.addBehavior(dropitBehavior)
    }
    
    struct PathNames {
        static let MiddleBarrier = "Middle Barrier"
        static let Attachment = "Attachment"
    }
    
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        let barrierSize = dropSize
        let barrierOrigin = CGPoint(x: gameView.bounds.midX - barrierSize.width / 2, y: gameView.bounds.midY - barrierSize.height / 2)
        //设置圆圈的边界
        let path = UIBezierPath(ovalInRect: CGRect(origin: barrierOrigin, size: barrierSize))
        dropitBehavior.addBarrier(path, named: PathNames.MiddleBarrier)
        
        gameView.setPath(path, named: PathNames.MiddleBarrier)
    }
    
    //UIDynamicAnimatorDelegate中的方法,当动画停止时
    func dynamicAnimatorDidPause(animator: UIDynamicAnimator) {
        removeCompletedRow()
    }
    
    
    var dropsPerRow = 10
    //设置方块的形状
    var dropSize: CGSize {
        let size = gameView.bounds.width / CGFloat(dropsPerRow)
        return CGSize(width: size, height: size)
    }

    //设置手势
    @IBAction func drop(sender: UITapGestureRecognizer) {
        drop()
    }
    
    var lastDroppedView: UIView?
    
    //掉落方法
    func drop() {
        //设置方块的初始位置及大小
        var frame = CGRect(origin: CGPointZero, size: dropSize)
        frame.origin.x = CGFloat.random(dropsPerRow) * dropSize.width
        
        //创建方块视图,并设置其颜色
        let dropView = UIView(frame: frame)
        dropView.backgroundColor = UIColor.random
        
        lastDroppedView = dropView
        
        dropitBehavior.addDrop(dropView)
    }
    
    
    @IBAction func grabDrop(sender: UIPanGestureRecognizer) {
        let gesturePoint = sender.locationInView(gameView)
        
        switch sender.state {
        case .Began:
            if let viewToAttachTo = lastDroppedView {
                attachment = UIAttachmentBehavior(item: viewToAttachTo, attachedToAnchor: gesturePoint)
                lastDroppedView = nil
            }
        case .Changed:
            attachment?.anchorPoint = gesturePoint
        case .Ended:
            attachment = nil
        default: break
        }
        
    }
    
    //当满行后消除方块
    func removeCompletedRow() {
        var dropsToRemove = [UIView]()
        var dropFrame = CGRect(x: 0, y: gameView.frame.maxY, width: dropSize.width, height: dropSize.height)
        
        repeat {
            dropFrame.origin.y -= dropSize.height
            dropFrame.origin.x = 0
            var dropsFound = [UIView]()
            var rowIsComplete = true
            for _ in 0 ..< dropsPerRow {
                if let hitView = gameView.hitTest(CGPoint(x: dropFrame.midX, y: dropFrame.midY), withEvent: nil) {
                    if hitView.superview == gameView {
                        dropsFound.append(hitView)
                    } else {
                        rowIsComplete = false
                    }
                }
                dropFrame.origin.x += dropSize.width            }
            if rowIsComplete {
                dropsToRemove += dropsFound
            }
        } while dropsToRemove.count == 0 && dropFrame.origin.y > 0
        
        for drop in dropsToRemove {
            dropitBehavior.removeDrop(drop)
        }
    }

}

private extension CGFloat {
    static func random(max:Int) -> CGFloat {
        return CGFloat(arc4random() % UInt32(max))
    }
}

private extension UIColor {
    class var random:UIColor {
        switch arc4random() % 5 {
        case 0: return UIColor.greenColor()
        case 1: return UIColor.blueColor()
        case 2: return UIColor.orangeColor()
        case 3: return UIColor.redColor()
        case 4: return UIColor.purpleColor()
        default: return UIColor.blackColor()
        }
    }
}


import UIKit

class BezierPathsView: UIView {

    private var bezierPath = [String: UIBezierPath]()
    
    func setPath(path: UIBezierPath?, named name: String) {
        bezierPath[name] = path
        setNeedsDisplay()
    }
    
    override func drawRect(rect: CGRect) {
        for (_,path) in bezierPath {
            path.stroke()
        }
    }

}

Stanford CS193p iOS开发课程笔记(十)

Stanford CS193p第十一课 Unwind Segues, Alerts, Timers, View Animation. 第十二课 Dynamic Animation

Unwind

Alerts/Action Sheets

Animation

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