Swift学习笔记六

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Project 14 Whack a Penguin

  1. ..< 误写成 <..

  2. 使用 SKCropNode 显示、隐藏图片

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    let cropNode = SKCropNode()
    cropNode.maskNode = nil 	// 都显示
    cropNode.maskNode = SKSpriteNode(imageNamed: "whackMask")

  3. 使用 SKAction、SKTexture

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    charNode.runAction(SKAction.moveByX(0, y: 80, duration: 0.05))
    charNode.texture = SKTexture(imageNamed: “penguinGood")

  4. 第一个 hideTime 为外部变量，第二个为内部变量，使用时必须带外部参数，show(hideTime: 1)，参数的含义比较明显。

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    func show(hideTime hideTime: Double) {…}

  5. 使用 dispatch_time 、dispatch_after，当前时间为 DISPATCH_TIME_NOW

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    func runAfterDelay(delay: NSTimeInterval, block: dispatch_block_t) {
    	let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay * Double(NSEC_PER_SEC)))	// 在秒和纳秒之间转换
    	dispatch_after(time, dispatch_get_main_queue(), block)
    }

  6. 使用 SKAction 的 waitForDuration/runBlock/sequence 方法，其中 sequence 是一系列的 action

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    func hit() {
        isHit = true
        let delay = SKAction.waitForDuration(0.25)
        let hide = SKAction.moveByX(0, y: -80, duration: 0.5)
        let notVisible = SKAction.runBlock { [unowned self] in
            self.visible = false
        }
        charNode.runAction(SKAction.sequence([delay, hide, notVisible]))
    }

  7. 使用 SKAction 的 playSoundFileNamed 方法播放音乐。

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    let whackSlot = node.parent!.parent as! WhackSlot
    SKAction.playSoundFileNamed
    whackSlot.charNode.xScale = 0.85 // x坐标方向缩小或者放大

Project 15 Animation

  1. Ctrl-drag 沿对角线，可以给自身添加约束。

  2. 使用 UIImageView，包括一个 UIImage

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    var imageView: UIImageView!
    imageView = UIImageView(image: UIImage(named: “penguin”))
    imageView.center = CGPoint(x: 512, y: 384)
    view.addSubview(imageView)

  3. 默认的动画是 ease-in-ease-out animation

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    UIView.animateWithDuration(1, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 5, options: [], 闭包) 尾随闭包

  4. 动画的移动、旋转

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    self.imageView.transform = CGAffineTransformMakeScale(2, 2)
    CGAffineTransformIdentity 	//恢复原状
    self.imageView.transform = CGAffineTransformMakeTranslation(-256, -256)  // 移动，从当前位置减去256
    self.imageView.transform = CGAffineTransformMakeRotation(CGFloat(M_2_PI)) 	// 旋转90度，总是找最短路径旋转
    self.imageView.alpha = 0.1  // 透明度

Project 16 JavaScript Injection

  1. StoryBoard上的实黄线：”this is where you view is,” 虚黄线： “this is where your view will be when your code runs.”

  2. 给应用添加扩展，新建 iOS > Application Extension > Action Extension

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    if let inputItem = extensionContext!.inputItems.first as? NSExtensionItem {
        if let itemProvider = inputItem.attachments?.first as? NSItemProvider {
             itemProvider.loadItemForTypeIdentifier(kUTTypePropertyList as String, options: nil, completionHandler: { [unowned self] (dict, error)in
             let itemDirectory = dict as! NSDictionary
             let javaScriptValues = itemDirectory[NSExtensionJavaScriptPreprocessingResultsKey] as! NSDictionary
             print(javaScriptValues)
             })
         }
    }

  3. 在 info.plist 添加 JavaScript 支持。

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    NSExtension > NSExtensionAttributes > NSExtensionActivationRule > NSExtensionActivationSupportsWebPageWithMaxCount
    NSExtension > NSExtensionAttributes > NSExtensionJavaScriptPreprocessingFile

  4. 处理 JavaScript

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    @IBAction func done() {
        let item = NSExtensionItem()
        let webDictionary = [NSExtensionJavaScriptPreprocessingResultsKey: ["customJavaScript": script.text]]
        let customJavaScript = NSItemProvider(item: webDictionary, typeIdentifier: kUTTypePropertyList as String)
        item.attachments = [customJavaScript]
        extensionContext!.completeRequestReturningItems([item], completionHandler: nil)
    }

  5. 添加键盘的监听器

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    let notificationCenter = NSNotificationCenter.defaultCenter()
    notificationCenter.addObserver(self, selector: "adjustForKeyboard", name: UIKeyboardWillHideNotification, object: nil)
    notificationCenter.addObserver(self, selector: "adjustForKeyboard", name: UIKeyboardWillChangeFrameNotification, object: nil)

  6. 自动调整键盘位置

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    func adjustForKeyboard(notification: NSNotification) {
          let userInfo = notification.userInfo!
          
          let keyboardScreenEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
          let keyboardViewEndFrame = view.convertRect(keyboardScreenEndFrame, fromView: view.window)
          
          if notification.name == UIKeyboardWillHideNotification {
              script.contentInset = UIEdgeInsetsZero
          } else {
              script.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardViewEndFrame.height, right: 0)
          }
          
          script.scrollIndicatorInsets = script.contentInset  // 不随view的滚动而滚动
          
          let selectedRange = script.selectedRange
          script.scrollRangeToVisible(selectedRange)
    }

Project 17 Swifty Ninja

  1. 使用 physicsWorld 的 gravity、speed 属性

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    physicsWorld.gravity = CGVector(dx: 0, dy: -6)
    physicsWorld.speed = 0.85
    SKShapeNode 的
    touchesBegan/touchesMoved/touchesEnded/touchesCancelled 方法。

  2. 使用 guard let ，否则 return，使用 SKAction 的 fadeOutWithDuration 方法。

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    guard let touch = touches.first else {
         return
    }
    activeSliceBG.runAction(SKAction.fadeOutWithDuration(0.25))  //逐渐消失
    activeSliceFG.removeAllActions()

  3. 使用 UIBezierPath

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    let path = UIBezierPath()
    path.moveToPoint(activeSlicePoints[0])
    for (var i=1; i<activeSlicePoints.count; ++i) {
        path.addLineToPoint(activeSlicePoints[i])
    }
    activeSliceBG.path = path.CGPath	//将 UIBezierPath 转换为 CGPath

  4. 先创建 action，然后 runAction(action)

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    let swooshSound = SKAction.playSoundFileNamed(soundName, waitForCompletion: true)
    runAction(swooshSound) { [unowned self] in
         self.swooshSoundActive = false
    }

  5. 创建枚举类，使用 SKPhysicsBody，CGVector 中属性为相对值

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    enum ForceBomb {
        case Never, Always, Default
    }
      func createEnemy(forceBomb forceBomb: ForceBomb = .Default) {
      	enemy.physicsBody = SKPhysicsBody(circleOfRadius: 64)
        enemy.physicsBody!.velocity = CGVector(dx: randomXVelocity * 40, dy: randomYVelocity * 40)
        enemy.physicsBody!.angularVelocity = randomAngularVelocity
        enemy.physicsBody!.collisionBitMask = 0
      }

  6. 使用 AVAudioPlayer 播放音乐

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    import AVFoundation
      let path = NSBundle.mainBundle().pathForResource("sliceBombFuse", ofType: nil)!
      let url = NSURL(fileURLWithPath: path)
      let sound = try! AVAudioPlayer(contentsOfURL: url)
      bombSoundEffect = sound
      sound.play()

  7. 将枚举类型映射为Int类型，然后可以使用 rawValue

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    enum SequenceType: Int {
        case OneNoBomb, One, TwoWithOneBomb, Two, Three, Four, Chain, FastChain
    }
        let nextSequence = SequenceType(rawValue: Int(RandomInt(2, max: 7)))!  //使用rawValue需要强制解包

  8. 使用 SKAction 的 group、sequence

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    let scaleOut = SKAction.scaleTo(0.001, duration: 0.02)
    let fadeOut = SKAction.fadeOutWithDuration(0.2)
    let group = SKAction.group([scaleOut, fadeOut])
    let seq = SKAction.sequence([group, SKAction.removeFromParent()])
    node.runAction(seq)

  9. userInteractionEnabled 是否停止用户交互

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    physicsWorld.speed = 0
    userInteractionEnabled = false

Project 18 iAd and Debugging

  1. ADBannerView 的使用，设置约束

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    import iAd      
      var bannerView: ADBannerView!
      bannerView = ADBannerView(adType: .Banner)
      bannerView.translatesAutoresizingMaskIntoConstraints = false
      bannerView.delegate = self
      bannerView.hidden = true
      view.addSubview(bannerView)
      let viewsDictionary = ["bannerView": bannerView]
      view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[bannerView]|", options: [], metrics: nil, views: viewsDictionary))
      view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("W:|[bannerView]|", options: [], metrics: nil, views: viewsDictionary))

  2. AppDelegate means that we can easily use it to store app-wide information. 获得 AppDelegate 的引用

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    let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    view.addSubview(appDelegate.bannerView)

  3. 上传到App Store时，Xcode自动将 assert 禁用掉

  4. 可以在断点上 Edit Breakpoint，可以在 breakpoint navigator 里添加 Exceptions
  5. 调试 Debug > View Debugging > Show View Frames / Capture View Hierarchy