觸摸時添加和刪除SKPhysicsJointPin的問題

我在添加和刪除touchesBegan函數中的SKPhysicsJointPin時遇到了問題。問題在於我的聯合聲明是在didMoveToView函數中聲明的，因爲它需要根據其中存在的表達式進行定位。觸摸時添加和刪除SKPhysicsJointPin的問題

因此，我不能在touchesBegan函數中引用SKPhysicsJoint，這對於我正在嘗試執行的項目來說是必需的。任何解決方案或建議？

代碼：

import SpriteKit 

class GameScene: SKScene, SKPhysicsContactDelegate { 

    var head = SKSpriteNode(imageNamed: "crown.png") 
    var headTexture = SKTexture(imageNamed: "crown.png") 

    var neck = SKSpriteNode(imageNamed: "throat.png") 
    var neckTexture = SKTexture(imageNamed: "throat.png") 

    override func didMoveToView(view: SKView) { 

     head.position.x = torso.position.x - 1 
     head.position.y = torso.position.y + 77 
     head.physicsBody = SKPhysicsBody(texture: headTexture, size: head.size) 
     head.physicsBody!.categoryBitMask = ColliderType.part.rawValue 
     head.physicsBody!.contactTestBitMask = ColliderType.part.rawValue 
     head.physicsBody!.collisionBitMask = ColliderType.part.rawValue 
     self.addChild(head) 

     neck.position.x = torso.position.x 
     neck.position.y = torso.position.y + 44 
     neck.physicsBody = SKPhysicsBody(texture: neckTexture, size: neck.size) 
     neck.physicsBody!.categoryBitMask = ColliderType.mjoint.rawValue 
     neck.physicsBody!.contactTestBitMask = ColliderType.mjoint.rawValue 
     neck.physicsBody!.collisionBitMask = ColliderType.mjoint.rawValue 
     self.addChild(neck) 

     let headToNeck = SKPhysicsJointPin.jointWithBodyA(head.physicsBody!, bodyB:neck.physicsBody!, anchor:CGPointMake(head.position.x, head.position.y - 20.8)) 
     headToNeck.shouldEnableLimits = true 
     self.physicsWorld.addJoint(headToNeck) 
    } 

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { 

     self.physicsWorld.removeJoint(headToNeck) 

    } 
}

來源

2016-07-06 Maxwell Kleinsasser

你可以刪除'touchesBegan'聯合'如果讓合資= head.physicsBody .joints.first {self.physicsWorld.removeJoint（joint）}' – 0x141E

嘗試創建一個類變量是這樣的：

class GameScene: SKScene, SKPhysicsContactDelegate { 

     var headToNeck: SKPhysicsJoint! 
     //other variables 

     override func didMoveToView(view: SKView) { 
      //other code 
      self.headToNeck = SKPhysicsJointPin.jointWithBodyA(head.physicsBody!, bodyB:neck.physicsBody!, anchor:CGPointMake(head.position.x, head.position.y - 20.8)) 
      self.headToNeck.shouldEnableLimits = true 
      self.physicsWorld.addJoint(self.headToNeck) 
     } 

     override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) { 
      self.physicsWorld.removeJoint(self.headToNeck) 
     } 
    }

來源

2016-07-07 12:34:32 claassenApps

昨天我找到了解決方案，實際上它非常類似於這個答案，感謝您的幫助！ –

觸摸時添加和刪除SKPhysicsJointPin的問題

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