碰撞位掩码值在 SpriteKit 中不起作用答案

【问题标题】：collisionBitMask values not working in SpriteKit碰撞位掩码值在 SpriteKit 中不起作用
【发布时间】：2017-08-04 15:07:29
【问题描述】：

我有两个想要相互碰撞的实体。我有一个结构来跟踪不同的物理类别：

struct PhysicsCategory {
    static let Player: Int32 = 0x1 << 1
    static let Obstacle: Int32 = 0x1 << 2
    static let Ground: Int32 = 0x1 << 3
}

我希望我的 Player 节点与我的 Obstacle 节点发生冲突。这是我的 Player 节点的物理特性：

    self.physicsBody = SKPhysicsBody(rectangleOf: (self.size))
    self.physicsBody?.isDynamic = true
    self.physicsBody?.categoryBitMask = UInt32(PhysicsCategory.Player)
    self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Obstacle)
    self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Ground)

这是我的障碍节点的物理原理

    self.physicsBody = SKPhysicsBody(rectangleOf: self.size)
    self.physicsBody?.categoryBitMask = UInt32(PhysicsCategory.Obstacle)
    self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Player)
    self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Ground)
    self.physicsBody?.isDynamic = true
    self.physicsBody?.velocity = CGVector(dx: -240, dy: 0)
    self.physicsBody?.linearDamping = 0
    self.physicsBody?.friction = 0

当他们穿越路径时，他们只是互相穿过。但是，它们都正确地与地面相撞。我做错了什么？

【问题讨论】：

编程的基本原理告诉你，如果你写 x = 1 并且在 x = 2 之后，你的 x 是 2

标签： swift sprite-kit skphysicsbody

【解决方案1】：

当您第二次设置 collisionBitMask 时，您将覆盖它。您应该使用符号| 设置OR 位掩码。

替换

self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Obstacle)
self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Ground)

与：

self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Obstacle) | UInt32(PhysicsCategory.Ground)

和

self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Player)
self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Ground)

与：

self.physicsBody?.collisionBitMask = UInt32(PhysicsCategory.Player) | UInt32(PhysicsCategory.Ground)

【讨论】：