Swift 如何在SpriteKit中检测两个对象何时接触

我在互联网上找不到关于如何做到这一点的信息。我只是想在触摸身体时运行一行代码。在这个例子中，我有一个带物理体的SKSpriteNode，另一个是地面。当他们触摸它时，它应该运行一行代码，这是我到目前为止所发现的全部

    let catGroup:UInt32 = 0x1 << 0
let groundGroup:UInt32 = 0x2 << 1
    cat.physicsBody?.categoryBitMask = catGroup
    cat.physicsBody?.contactTestBitMask = groundGroup
    ground.physicsBody?.categoryBitMask = groundGroup
    ground.physicsBody?.contactTestBitMask = catGroup

---

让catGroup:UInt32=0x1不要成为一个固执己见的人，但你不应该以“我在互联网上找不到任何东西”开始提问，因为这显然是不正确的。在SpriteKit中，碰撞检测是基础知识之一，有上百万的教程

现在谈谈你的问题。你没有给你的精灵一个真实的物理身体，你的物理类别设置得很奇怪。将您的代码更改为此

 struct PhysicsCategory {
       static let cat:UInt32 = 0x1 << 0
       static let ground:UInt32 = 0x1 << 1
 }

 class GameScene: SKScene, SKPhysicsContactDelegate {


     override func didMoveToView(view: SKView) {
     /* Setup your scene here */

         physicsWorld.contactDelegate = self


         cat.physicsBody = SKPhysicsBody(rectangleOfSize: cat.size) // FORGOT THIS
         cat.physicsBody?.categoryBitMask = PhysicsCategory.cat
         cat.physicsBody?.contactTestBitMask = PhysicsCategory.ground

         ground.physicsBody = SKPhysicsBody(rectangleOfSize: ground.size) // FORGOT THIS
         ground.physicsBody?.categoryBitMask = PhysicsCategory.ground
         ground.physicsBody?.contactTestBitMask = PhysicsCategory.cat // You dont really need this line as long as you have set it on the other body.
    }

    func didBeginContact(contact: SKPhysicsContact) {
         var firstBody: SKPhysicsBody
         var secondBody: SKPhysicsBody

        if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
            firstBody = contact.bodyA
            secondBody = contact.bodyB
        } else {
            firstBody = contact.bodyB
            secondBody = contact.bodyA
        }

         if firstBody.categoryBitMask == PhysicsCategory.cat && secondBody.categoryBitMask == PhysicsCategory.ground {
             print("contact")
         }
     } 
 }

希望这有助于
可能的重复您是否设置了didBeginContact必须与Physivs联系的类委托协议，以及设置了“Delegate”属性？完成此操作后，在dudBeginContact中放入一个打印（“检测到联系人”）以查看是否正在调用它（或者更恰当地说，设置一个断点）。您还不能替换firstBody和secondBody，因为您需要检查它们的类别BitMask，以确定哪只是猫，哪只是地面。感谢您的帮助，但它尝试了此操作，但没有成功。很抱歉，物理类别结构中有1个小错误，应该是静态的。我更新了我的全部答案，使它更容易阅读。让我知道进展如何
 struct PhysicsCategory {
       static let cat:UInt32 = 0x1 << 0
       static let ground:UInt32 = 0x1 << 1
 }

 class GameScene: SKScene, SKPhysicsContactDelegate {


     override func didMoveToView(view: SKView) {
     /* Setup your scene here */

         physicsWorld.contactDelegate = self


         cat.physicsBody = SKPhysicsBody(rectangleOfSize: cat.size) // FORGOT THIS
         cat.physicsBody?.categoryBitMask = PhysicsCategory.cat
         cat.physicsBody?.contactTestBitMask = PhysicsCategory.ground

         ground.physicsBody = SKPhysicsBody(rectangleOfSize: ground.size) // FORGOT THIS
         ground.physicsBody?.categoryBitMask = PhysicsCategory.ground
         ground.physicsBody?.contactTestBitMask = PhysicsCategory.cat // You dont really need this line as long as you have set it on the other body.
    }

    func didBeginContact(contact: SKPhysicsContact) {
         var firstBody: SKPhysicsBody
         var secondBody: SKPhysicsBody

        if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
            firstBody = contact.bodyA
            secondBody = contact.bodyB
        } else {
            firstBody = contact.bodyB
            secondBody = contact.bodyA
        }

         if firstBody.categoryBitMask == PhysicsCategory.cat && secondBody.categoryBitMask == PhysicsCategory.ground {
             print("contact")
         }
     } 
 }

 cat.physicsBody?.affectedByGravity = false
 ground.physicsBody?.affectedByGravity = false