这似乎几乎令人难以置信,但是,
let pb = model.physicsBody?.copy() as! SKPhysicsBody
print("orig .. \(model.physicsBody!.linearDamping)")
print("pb .. \(pb.linearDamping)")
他们不一样。不完全是。
这太奇怪了,我一定做错了什么。我究竟做错了什么?
除了手动复制所有属性,并随着代码的发展而永久维护代码之外,如何做到这一点?
如果有人需要,这是一个 dupe-qualities 功能,可以节省打字。(这是 2017 年的——当然,随着苹果增加品质,它必须永远保持下去。)
extension SKSpriteNode
{
func dupe() -> Any {
// annoyingly, Apple does not provide a dupe function as you would use
// when spawning from a model.
let c = self.copy() as! SKSpriteNode
c.physicsBody = self.physicsBody!.copy() as? SKPhysicsBody
c.physicsBody?.affectedByGravity = self.physicsBody!.affectedByGravity
c.physicsBody?.allowsRotation = self.physicsBody!.allowsRotation
c.physicsBody?.isDynamic = self.physicsBody!.isDynamic
c.physicsBody?.pinned = self.physicsBody!.pinned
c.physicsBody?.mass = self.physicsBody!.mass
c.physicsBody?.density = self.physicsBody!.density
c.physicsBody?.friction = self.physicsBody!.friction
c.physicsBody?.restitution = self.physicsBody!.restitution
c.physicsBody?.linearDamping = self.physicsBody!.linearDamping
c.physicsBody?.angularDamping = self.physicsBody!.angularDamping
c.physicsBody?.categoryBitMask = self.physicsBody!.categoryBitMask
c.physicsBody?.collisionBitMask = self.physicsBody!.collisionBitMask
c.physicsBody?.fieldBitMask = self.physicsBody!.fieldBitMask
c.physicsBody?.contactTestBitMask = self.physicsBody!.contactTestBitMask
return c
}
}
(只是一个人的意见,我觉得最好不要仅仅覆盖 NSCopy,因为整个事情是一个敏感的问题,为了下一位工程师,最好简单明了。“欺骗”是很常见的一个游戏对象对另一个游戏对象的品质,所以,这很好。)