當節點靠近時啓動動畫

Question

我有2個帶紋理節點（SKSpriteNode），我試圖創建一些動畫，當節點靠近另一個帶有y軸的節點（範圍100 - 0）並且動畫在此處開始時時刻。 我試圖做一些類似於割繩子的事情，當糖果在Om-Nom附近時，他張開嘴要抓住糖果。 幫我看看代碼，請（ 對不起，我的英語

Answer 1

你可以實現這種計算的少量代碼行：

class GameScene: SKScene { 
    var sprite1 : SKSpriteNode! 
    var sprite2 : SKSpriteNode! 
    var range : CGFloat = 0.0 
    override func didMoveToView(view: SKView) { 
     self.range = randomCGFloat(0.0, max: 100.0) 
     sprite1 = SKSpriteNode.init(color: SKColor.blueColor(), size: CGSizeMake(40,40)) 
     sprite2 = SKSpriteNode.init(color: SKColor.redColor(), size: CGSizeMake(40,40)) 
     addChild(sprite1) 
     addChild(sprite2) 
     // Try to generate 10 positions and check relative distance 
     print("The range to check is :\(range)") 
     for i in 0...9 { 
      print("\(i)) time:") 
      let isNear = checkDistanceBtwSprites() 
      if isNear { 
       // do whatever you want with your sprites 
      } 
     } 
    } 
    func checkDistanceBtwSprites()->Bool{ 
     sprite1.position = getRandomPosition(40, maxX: 40, minY: 0, maxY: 320) 
     sprite2.position = getRandomPosition(40, maxX: 40, minY: 0, maxY: 320) 
     let distance = getDistance((sprite1.position), p2: (sprite2.position)) 
     print("distance for sprite1 and sprite2 is : \(distance)") 
     if distance <= self.range { 
      print("# -> success: sprite1 is near sprite2") 
      return true 
     } 
     return false 
    } 
    func getRandomPosition(minX: CGFloat, maxX: CGFloat, minY:CGFloat, maxY:CGFloat)->CGPoint { 
     return CGPointMake(randomCGFloat(minX, max: maxX),randomCGFloat(minY, max: maxY)) 
    } 
    func randomCGFloat(min: CGFloat, max: CGFloat)->CGFloat { 
     return (CGFloat(arc4random())/CGFloat(UINT32_MAX)) * (max - min) + min 
    } 
    func getDistance(p1:CGPoint,p2:CGPoint)->CGFloat { 
     let xDist = (p2.x - p1.x) 
     let yDist = (p2.y - p1.y) 
     return CGFloat(sqrt((xDist * xDist) + (yDist * yDist))) 
    } 
} 

輸出：