在Swift中按住按鈕移動對象

Question

我有一個小的太空入侵者游戲，我添加了兩個按鈕leftButton和rightButton ，我希望只要其中一個按鈕被觸摸並按正確的方向移動， ship就會移動。

我讓它向正確的方向移動，但我必須反復點擊按鈕，但我希​​望ship在玩家按住按鈕時移動。

為簡單起見，我只發布左按鈕的代碼，因為我認為編碼其他按鈕的方式是相同的：

class GameScene: SKScene {
   var leftButton = SKSpriteNode()
   var ship = SKSpriteNode()

   override func didMove(to view: SKView) {
       leftButton = self.childNode(withName: "left") as! SKSpriteNode
       ship = self.childNode(withName: "player") as! SKSpriteNode
   }

   override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
       for touch: AnyObject in touches {
           let pointTouched = touch.location(in: self)

           if leftButton.contains(pointTouched) {
               player.position.x -= 30
           }
      }
   }
}

Answer 1

為此使用Action。 還有其他方法可以實現這一點，但這對您有用。

首先添加一個func moveBy ，它取你希望你的船的方向和一個key: String 。 您將在稍后的touchesBegan使用這些。

func moveShip (moveBy: CGFloat, forTheKey: String) {
    let moveAction = SKAction.moveBy(x: moveBy, y: 0, duration: 1)
    let repeatForEver = SKAction.repeatForever(moveAction)
    let seq = SKAction.sequence([moveAction, repeatForEver])

    //run the action on your ship
    player.run(seq, withKey: forTheKey)
}

的touchesBegan：

        if leftButton.contains(pointTouched) {
            moveShip(moveBy: -30, forTheKey: "left")
        }

        if rightButton.contains(pointTouched) {
            moveShip(moveBy: 30, forTheKey: "right")
        }

編輯：

touchesEnded：

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    player.removeAction(forKey: "left")
    player.removeAction(forKey: "right")
}

Answer 2

您可以使用SKAction：`

class GameScene: SKScene {
  var leftButton = SKSpriteNode()
  var ship = SKSpriteNode()
       let Left = SKAction.repeatForever(
        SKAction.sequence([
            SKAction.wait(forDuration: 0.5),
            SKAction.run({
              SKAction.move(by: CGVector(dx: -30, dy: 0), duration:0.5)
            }  )]))
 //This SKAction will repeat it self forever, until the action is removed. It's build from a sequence of to other actions, move and wait.
  override func didMove(to view: SKView) {
      leftButton = self.childNode(withName: "left") as! SKSpriteNode
     ship = self.childNode(withName: "player") as! SKSpriteNode
   }

  override func touchesBegan(_ touches: Set<UITouch>, with event:UIEvent?) {
      for touch: AnyObject in touches {
          let pointTouched = touch.location(in: self)

          if leftButton.contains(pointTouched) {
         self.run(Left, withKey: "left")
    //Keys will help you remove actions, as well as to remove certain actions, sorting them by group
          }
    }
 }
     override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?)   {
    self.removeAction(forKey: "left")

}
     }

更新你對按鈕進行編碼的方式非常奇怪我這樣做它總是有效：`

 if let touch = touches.first{
          let pos = touch.location(in: self)
          let node = self.atPoint(pos)
          if node == button {

              if let view = view {

                   //your code

            }

         }}

`