SpriteKit检测多次碰撞而不是一次(Swift 3)

Question

我的 SKScene 类中有 3 个 SKSpriteNode。其中一个是玩家，另一个是金色和不可见的完成对象，例如当玩家触摸它时，游戏就完成了。我的问题是，当玩家碰撞金币时，他的金币预算应该只增加50金币。但是，Xcode 检测到多次碰撞和黄金预算增加数倍。检测到 50-60 次碰撞，而不是一次碰撞。我研究了如何解决这个问题。我发现我应该使用 Bool，我试图设置 bool，但它没有解决我的问题。有没有人可以帮助我如何检测一次碰撞？这是我的游戏场景类代码：

import SpriteKit
import GameplayKit
class level3: SKScene, SKPhysicsContactDelegate {
let playerFileName = "player"
let starFileName = "50Gold"
let goalFileName = "goal"
let playerCategory   : UInt32 = 0x1 << 1
let goalCategory : UInt32 = 0x1 << 2
let starCategory : UInt32 = 0x1 << 3
override func didMove(to view: SKView) {
super.didMove(to: view)
physicsWorld.contactDelegate = self
let goal = childNode(withName: goalFileName) as! SKSpriteNode
let player = childNode(withName: playerFileName) as! SKSpriteNode
let star = childNode(withName: starFileName) as! SKSpriteNode
player.physicsBody!.categoryBitMask = playerCategory
goal.physicsBody!.categoryBitMask = goalCategory
star.physicsBody?.collisionBitMask = 1
player.physicsBody?.collisionBitMask = 1
goal.physicsBody?.collisionBitMask = 1
goal.physicsBody?.isDynamic = true
goal.physicsBody!.contactTestBitMask = playerCategory
player.physicsBody?.isDynamic = true
star.physicsBody?.isDynamic = true
player.physicsBody?.contactTestBitMask = starCategory
star.physicsBody?.categoryBitMask = starCategory
func didBegin(_ contact: SKPhysicsContact) {
// 1
var firstBody: SKPhysicsBody
var secondBody: SKPhysicsBody
// 2
if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
firstBody = contact.bodyA
secondBody = contact.bodyB
} else {
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if firstBody.categoryBitMask == playerCategory && secondBody.categoryBitMask == goalCategory {
contact.bodyB.node?.removeFromParent()
}
if firstBody.categoryBitMask == playerCategory && secondBody.categoryBitMask == starCategory {
PlaySceneViewController.instance.gold += 50
print(PlaySceneViewController.instance.gold)
contact.bodyB.node?.removeFromParent()
}
}
}
}

Answer 1

是的 - 这会发生。处理它的方法是(在某些情况下，你不能让 sprite-kit 不多次调用 didBegin(是确保您的联系代码适应这一点，并且多次处理合约不会导致问题(例如多次添加到分数、删除多个生命、尝试访问已被删除的节点或 physicsBody 等(。

有关更多详细信息和可能的解决方案，请参阅此答案： https://stackoverflow.com/a/44384390/1430420