我正在使用 Sprite Kit 和 Swift 制作游戏,我在屏幕底部有一个 Sprite,从顶部掉落的 Sprite 我想抓住并粘在底部的 Sprite 上,所以我正在尝试使用 SKPhysicsJointFixed但是当物体发生碰撞而不是下落的物体粘在底部的物体上时,它应该抓住并附着它,看起来好像底部的精灵适应了下落精灵的物理特性,然后随着它从屏幕上掉下来。这是我的 didBeginContact 方法中的代码。并且 skewer 是底部 Sprite 的名称,它应该始终位于底部并且不会消失。
if contact.bodyA.node!.name == "Skewer"
{
let boundX = skewer.physicsBody?.node?.position.x
let fixedJoint = SKPhysicsJointFixed.jointWithBodyA(contact.bodyA.node!.physicsBody, bodyB: contact.bodyB.node!.physicsBody, anchor: CGPoint(x: boundX!, y: boundY))
physicsWorld.addJoint(fixedJoint)
// contact.bodyB.node!.removeFromParent()
}
else
{
contact.bodyA!.node!.removeFromParent()
}
和底部屏幕精灵的物理在这里
func makeSkewer()
{
skewer.name = "Skewer"
skewer.position = CGPoint(x: size.width * 0.5, y: size.height * 0.244)
skewer.physicsBody = SKPhysicsBody(rectangleOfSize: skewer.size)
skewer.physicsBody?.affectedByGravity = false
skewer.physicsBody?.categoryBitMask = kSkewerCategory
skewer.physicsBody?.contactTestBitMask = kFoodCategory
skewer.physicsBody?.collisionBitMask = kSceneEdgeCategory
addChild(skewer)
}
和坠落精灵的物理在这里
func random() ->CGFloat
{
return CGFloat(Float(arc4random()) / 0xFFFFFFFF)
}
func random(#min: CGFloat,max: CGFloat) -> CGFloat
{
return random() * (max - min) + min
}
func addFood()
{
let randomCatchIndex = Int(arc4random_uniform(UInt32(foods.count)))
let food = SKSpriteNode(imageNamed: foods[randomCatchIndex])
let actualX = random(min: food.size.width/2, max: size.width - food.size.width/2)
let actualDuration = random(min: CGFloat(1.5), max: CGFloat(8.0))
let actionMove = SKAction.moveTo(CGPoint(x: actualX, y: -food.size.height/2), duration: NSTimeInterval(actualDuration))
let actionMoveDone = SKAction.removeFromParent()
food.physicsBody = SKPhysicsBody(rectangleOfSize: food.size)
food.position = CGPoint(x: actualX, y: size.height + food.size.height/2)
food.physicsBody?.categoryBitMask = kFoodCategory
food.physicsBody?.contactTestBitMask = kSkewerCategory
food.physicsBody?.collisionBitMask = 0x0
food.physicsBody?.dynamic = true
food.runAction(SKAction.sequence([actionMove, actionMoveDone]))
addChild(food)
}