如何使SKSpriteNode落在下降曲线

我现在拥有：节点当前只在x轴上以直线行进。如何使SKSpriteNode落在下降曲线

let actionBomb = SKAction.repeatForever(SKAction.moveTo(x: 495, duration: 3.0))

我正在寻找实现：我们的目标是要拥有一个向下的曲线节点行程，直到击中地面。我不知道如何去实现这一点。

这里是我当前的代码：

func bombAction(){ 


     if(self.action(forKey: "spawnBomb") != nil){return} 
     let bombTimer = SKAction.wait(forDuration: 5, withRange: 8) 
     let spawnbombA = SKAction.run { 

      self.bomb = SKSpriteNode(imageNamed: "bomb1") 
      self.bomb.zPosition = 1 
      self.bomb.physicsBody = SKPhysicsBody(circleOfRadius: self.bomb.size.height/10.0) 
      self.bomb.physicsBody?.isDynamic = true 
      self.bomb.physicsBody?.allowsRotation = false 
      self.bomb.physicsBody?.affectedByGravity = true 

      var bombPosition = Array<CGPoint>() 

      bombPosition.append((CGPoint(x:400, y:475))) 
      bombPosition.append((CGPoint(x:500, y:475))) 
      bombPosition.append((CGPoint(x:750, y:475))) 

let shuffledLocations = GKRandomSource.sharedRandom().arrayByShufflingObjects(in: bombPosition) as! [CGPoint] 

      self.bomb.position = shuffledLocations[0] 

      let spawnLocationBomb = bombPosition[Int(arc4random_uniform(UInt32(bombPosition.count)))] 

      let actionBomb = SKAction.repeatForever(SKAction.moveTo(x: 495, duration: 3.0)) 
      self.bomb.run(actionBomb) 
      self.bomb.position = spawnLocationBomb 
      self.addChild(self.bomb) 
      print(spawnLocationBomb) 

     } 

     let sequenceBomb = SKAction.sequence([bombTimer, spawnbombA]) 
     self.run(SKAction.repeatForever(sequenceBomb), withKey: "spawnBomb")  
     }

来源

2017-02-17 P.Dane

动作：SKAction.moveTo不受重力影响，移动炸弹，你应该使用冲动力来代替。检查[this]（https://developer.apple.com/reference/spritekit/skphysicsbody/1519900-applyimpulse） –

不要忘记设置重力场景的physicsWorld

class GameScene: SKScene { 

    override func didMove(to view: SKView) {   
     physicsWorld.gravity = CGVector(dx: 0, dy: -1) 
    } 
}

来源

2017-02-17 09:57:12

如何使SKSpriteNode落在下降曲线

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