Swift3 打开和关闭物理

我试图解决一个问题，一个精灵节点可以通过一个平台向上跳，但不能向下跳。我尝试使用以下代码：

override func didMove(to view: SKView) {
    if (thePlayer.position.y > stonePlatform1.position.y) ==  true {
        stonePlatform1.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: stonePlatform.size.width * 0.9, height: stonePlatform.size.height * 0.75))
        stonePlatform1.physicsBody!.isDynamic = false
        stonePlatform1.physicsBody!.affectedByGravity = false
        stonePlatform1.physicsBody!.categoryBitMask = BodyType.object.rawValue
        stonePlatform1.physicsBody!.contactTestBitMask = BodyType.object.rawValue
        stonePlatform1.physicsBody!.restitution = 0.4
    }
}

这个想法是当玩家在平台上方时打开平台的物理主体。然而，当我使用这个代码时，物理根本不起作用。事实上，我尝试使用以下代码：

override func didMove(to view: SKView) {
    if (thePlayer.position.y < stonePlatform1.position.y) ==  true {
        stonePlatform1.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: stonePlatform.size.width * 0.9, height: stonePlatform.size.height * 0.75))
        stonePlatform1.physicsBody!.isDynamic = false
        stonePlatform1.physicsBody!.affectedByGravity = false
        stonePlatform1.physicsBody!.categoryBitMask = BodyType.object.rawValue
        stonePlatform1.physicsBody!.contactTestBitMask = BodyType.object.rawValue
        stonePlatform1.physicsBody!.restitution = 0.4
    }
}

override func didMove（to view:SKView）{
如果（thePlayer.position.y

---

物理也没有打开。如果If语句不存在，那么物理总是有效的

您可以尝试从物理体开始，将其设置为

nil

，然后在玩家位于其上方后设置物理值。同样，这种代码应该在update函数中。在didMove中使用它只会让它被调用一次

override func update(_ currentTime: TimeInterval){
 if (thePlayer.position.y < stonePlatform1.position.y) && stonePlatform1.physicsBody != nil {
       stonePlatform1.physicsBody = nil
 }else if (thePlayer.position.y > stonePlatform1.position.y) && stonePlatform1.physicsBody == nil{
    setPhysicsOnPlatform(stonePlatform1)
 }
}

func setPhysicsOnPlatform(_ platform: SKSpriteNode){
   platform.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: stonePlatform.size.width * 0.9, height: stonePlatform.size.height * 0.75))
   ...
   //the rest of your physics settings
}

覆盖函数更新（\uCurrentTime:TimeInterval）{
如果（thePlayer.position.ystonePlatform1.position.y）和&stonePlatform1.physicsBody==nil{
setPhysicsOnPlatform（stonePlatform1）
}
}
func setPhysicsOnPlatform（u平台：SKSpriteNode）{
platform.physicsBody=SKPhysicsBody（矩形：CGSize（宽度：stonePlatform.size.width*0.9，高度：stonePlatform.size.height*0.75））
...
//其余的物理设置
}

---

你还应该对球员和主播的身高做一些调整。否则，如果您的主播点为（0,0），而玩家正在通过平台的一半，则将应用物理，并会出现不希望出现的结果。

您可以尝试从物理主体开始，将其设置为

nil

，然后在玩家位于其上方后将物理值设置为该主体。同样，这种代码应该在update函数中。在didMove中使用它只会让它被调用一次

override func update(_ currentTime: TimeInterval){
 if (thePlayer.position.y < stonePlatform1.position.y) && stonePlatform1.physicsBody != nil {
       stonePlatform1.physicsBody = nil
 }else if (thePlayer.position.y > stonePlatform1.position.y) && stonePlatform1.physicsBody == nil{
    setPhysicsOnPlatform(stonePlatform1)
 }
}

func setPhysicsOnPlatform(_ platform: SKSpriteNode){
   platform.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: stonePlatform.size.width * 0.9, height: stonePlatform.size.height * 0.75))
   ...
   //the rest of your physics settings
}

覆盖函数更新（\uCurrentTime:TimeInterval）{
如果（thePlayer.position.ystonePlatform1.position.y）和&stonePlatform1.physicsBody==nil{
setPhysicsOnPlatform（stonePlatform1）
}
}
func setPhysicsOnPlatform（u平台：SKSpriteNode）{
platform.physicsBody=SKPhysicsBody（矩形：CGSize（宽度：stonePlatform.size.width*0.9，高度：stonePlatform.size.height*0.75））
...
//其余的物理设置
}

---

你还应该对球员和主播的身高做一些调整。否则，如果您的主播点为（0,0），且玩家在平台中间，则将应用物理，并会出现不希望出现的结果。

您可以使用此平台的节点速度，如下所示：

SpriteKit-Swift 3代码：

private var up1 : SKSpriteNode!
private var down1 : SKSpriteNode!
private var down2 : SKSpriteNode!
private var player : SKSpriteNode!

override func didMove(to view: SKView) {
    up1 = self.childNode(withName: "up1") as! SKSpriteNode
    down1 = self.childNode(withName: "down1") as! SKSpriteNode
    down2 = self.childNode(withName: "down2") as! SKSpriteNode
    player = self.childNode(withName: "player") as! SKSpriteNode
    up1.physicsBody?.categoryBitMask = 0b0001 // Mask for UoPlatforms
    down1.physicsBody?.categoryBitMask = 0b0010 // Mask for downPlatforms
    down2.physicsBody?.categoryBitMask = 0b0010 // Same mask
}

override func update(_ currentTime: TimeInterval) {
    player.physicsBody?.collisionBitMask = 0b0000 // Reset the mask

    // For UP only Platform
    if (player.physicsBody?.velocity.dy)! < CGFloat(0.0) {
        player.physicsBody?.collisionBitMask |= 0b0001 // The pipe | operator adds the mask by binary operations
    }

    // For Down only platforms
    if (player.physicsBody?.velocity.dy)! > CGFloat(0.0) {
        player.physicsBody?.collisionBitMask |= 0b0010  // The pipe | operator adds the mask by binary operations
    }

}

private var up1:SKSpriteNode！
一等兵：斯普林泰诺德！
二等兵：斯普林泰诺德！
私人玩家：斯普林泰诺德！
覆盖func didMove（到视图：SKView）{
up1=self.childNode（名称为：“up1”）作为！SKSpriteNode
down1=self.childNode（名称为“down1”）作为！SKSpriteNode
down2=self.childNode（名称为“down2”）作为！SKSpriteNode
player=self.childNode（名称为“player”）as！SKSpriteNode
up1.physicsBody？.categoryBitMask=0b0001//UO平台的掩码
down1.physicsBody？.categoryBitMask=0b0010//下行平台的掩码
down2.physicsBody？.categoryBitMask=0b0010//相同的掩码
}
覆盖函数更新（uCurrentTime:TimeInterval）{
player.physicsBody？.collisionBitMask=0b0000//重置掩码
//仅限上站台
if（player.physicsBody？.velocity.dy）！CGFloat（0.0）{
player.physicsBody？.collisionBitMask |=0b0010//管道|操作符通过二进制操作添加掩码
}
}

源代码和示例如下：

该示例显示： 绿色平台->仅向下 红色平台->仅向上

---

您可以使用此平台的节点速度，如下所示：

SpriteKit-Swift 3代码：

private var up1 : SKSpriteNode!
private var down1 : SKSpriteNode!
private var down2 : SKSpriteNode!
private var player : SKSpriteNode!

override func didMove(to view: SKView) {
    up1 = self.childNode(withName: "up1") as! SKSpriteNode
    down1 = self.childNode(withName: "down1") as! SKSpriteNode
    down2 = self.childNode(withName: "down2") as! SKSpriteNode
    player = self.childNode(withName: "player") as! SKSpriteNode
    up1.physicsBody?.categoryBitMask = 0b0001 // Mask for UoPlatforms
    down1.physicsBody?.categoryBitMask = 0b0010 // Mask for downPlatforms
    down2.physicsBody?.categoryBitMask = 0b0010 // Same mask
}

override func update(_ currentTime: TimeInterval) {
    player.physicsBody?.collisionBitMask = 0b0000 // Reset the mask

    // For UP only Platform
    if (player.physicsBody?.velocity.dy)! < CGFloat(0.0) {
        player.physicsBody?.collisionBitMask |= 0b0001 // The pipe | operator adds the mask by binary operations
    }

    // For Down only platforms
    if (player.physicsBody?.velocity.dy)! > CGFloat(0.0) {
        player.physicsBody?.collisionBitMask |= 0b0010  // The pipe | operator adds the mask by binary operations
    }

}

private var up1:SKSpriteNode！
一等兵：斯普林泰诺德！
二等兵：斯普林泰诺德！
私人玩家：斯普林泰诺德！
覆盖func didMove（到视图：SKView）{
up1=self.childNode（名称为：“up1”）作为！SKSpriteNode
down1=self.childNode（名称为“down1”）作为！SKSpriteNode
down2=self.childNode（名称为“down2”）作为！SKSpriteNode
player=self.childNode（名称为“player”）as！SKSpriteNode
up1.physicsBody？.categoryBitMask=0b0001//UO平台的掩码
down1.physicsBody？.categoryBitMask=0b0010//下行平台的掩码
down2.physicsBody？.categoryBitMask=0b0010//相同的掩码
}
覆盖函数更新（uCurrentTime:TimeInterval）{
player.physicsBody？.collisionBitMask=0b0000//重置掩码
//仅限上站台
if（player.physicsBody？.velocity.dy）！CGFloat（0.0）{
player.physicsBody？.collisionBitMask |=0b0010//管道|操作符通过二进制操作添加掩码
}
}

带有exa的源代码