func didBegin(_ contact: SKPhysicsContact) { let collision = Collision(masks: (first: contact.bodyA.categoryBitMask
node.frame.size.width) { [node removeFromParent]; } }]; } 设置物体碰撞效果 - (void)didBeginContact:(SKPhysicsContact burstNode runAction:[SKAction removeFromParent]]; }); } } } - (void) didEndContact:(SKPhysicsContact