SpriteKit categoryBitMask 无法识别

Question

我有三个物理类别：英雄、地面和墙。我的问题是地面的物理类别没有被识别。为了解决这个问题，我在 hero 与墙壁和地面碰撞时打印了位掩码。 Wall 按预期工作并显示其位掩码 2。然而，Ground 显示 4294967295。（它应该是 4。）Ground 有一个边缘物理体并且它起作用是因为英雄没有穿过它，它只是没有被识别为地面。

物理类别

enum PhysicsCategory:UInt32
{
    case hero = 1
    case wall = 2
    case ground = 4
}

地面class:

class Ground: SKSpriteNode
{
    var groundTexture = SKTexture(imageNamed: "ground4")
    var jumpWidth = CGFloat()
    var jumpCount = CGFloat(1)

    func spawn(parentNode: SKNode, position: CGPoint, size:CGSize)
    {
        parentNode.addChild(self)
        self.size = size
        self.position = position
        self.zPosition = 2
        self.anchorPoint = CGPointMake(0, 1)
        self.texture = SKTexture(imageNamed: "ground4")
        self.physicsBody?.categoryBitMask = PhysicsCategory.ground.rawValue
        self.physicsBody?.affectedByGravity = false
        self.physicsBody?.dynamic = false

        let pointTopRight = CGPoint(x: size.width, y: 0)
        self.physicsBody = SKPhysicsBody(edgeFromPoint: CGPointZero, toPoint: pointTopRight)
    }

didMoveToView:

let groundPosition = CGPoint(x: -self.size.width, y: 30)
let groundSize = CGSize(width: self.size.width * 3, height: 0) 
ground.spawn(world, position: groundPosition, size: groundSize)

didBeginContact

let firstBody = contact.bodyA
let secondBody = contact.bodyB

if firstBody.categoryBitMask == PhysicsCategory.hero.rawValue && secondBody.categoryBitMask == PhysicsCategory.ground.rawValue || firstBody.categoryBitMask == PhysicsCategory.ground.rawValue && secondBody.categoryBitMask == PhysicsCategory.hero.rawValue
        {
            print("contact with the ground!")
        }

Answer 1

您实际上是在尝试设置 categoryBitMask 之后创建 physicsBody。所以你试图将 categoryBitMask 设置为 nil...

你只需要将那一行移动...

func spawn(parentNode: SKNode, position: CGPoint, size:CGSize) { parentNode.addChild(self) self.size = size self.position = position self.zPosition = 2 self.anchorPoint = CGPointMake(0, 1) self.texture = SKTexture(imageNamed: "ground4") let pointTopRight = CGPoint(x: size.width, y: 0) self.physicsBody = SKPhysicsBody(edgeFromPoint: CGPointZero, toPoint: pointTopRight) self.physicsBody?.categoryBitMask = PhysicsCategory.ground.rawValue self.physicsBody?.affectedByGravity = false self.physicsBody?.dynamic = false }

SpriteKit categoryBitMask 无法识别

SpriteKit categoryBitMask not recognized

bitmask

game-physics

sprite-kit

skphysicsbody

swift