didBeginContact逻辑OSX swift

Question

我在创建的OSX游戏的didBeginContact里面的逻辑有些麻烦。这是写在迅速，这里是代码当前是：

func didBeginContact(contact: SKPhysicsContact) { 

    let collision: UInt32 = contact.bodyA.categoryBitMask | 
     contact.bodyB.categoryBitMask 

    if collision == PhysicsCategory.player | PhysicsCategory.wall { 

    } else if collision == 
     PhysicsCategory.player | PhysicsCategory.box { 
      player.setJump(true) 

    } else if collision == 
     PhysicsCategory.player | PhysicsCategory.floor { 
      player.setJump(true) 
    } 

    if collision == 
     PhysicsCategory.laser | PhysicsCategory.wall { 

      effects = SKEmitterNode(fileNamed: "Explosion.sks") 
      addChild(effects!) 
      laser!.removeFromParent() 
    } 

    else if collision == 
     PhysicsCategory.laser | PhysicsCategory.floor { 
      effects = SKEmitterNode(fileNamed: "Explosion.sks") 
      addChild(effects!) 
      laser!.removeFromParent() 
    } 

我觉得这混乱的if语句是效率极其低下，但我不知道如何将其转换为一个switch语句或者是否会甚至更有效率。我尝试删除'其他'，只是有一系列的'如果'的声明，但当碰撞发生时，我还有更多的错误（盒子掉入墙壁等等。）任何建议将是令人满意的

Answer 1

如果有人绊倒了这一点，这是我如何解决它。

let collision: UInt32 = contact.bodyA.categoryBitMask | 

contact.bodyB.categoryBitMask 

    switch collision{ 

    case PhysicsCategory.player | PhysicsCategory.floor: 
     playerObj.setJump(true) 

    case PhysicsCategory.player | PhysicsCategory.box: 
     playerObj.setJump(true) 

    case PhysicsCategory.player | PhysicsCategory.wall: 
     return 
    // ect... 
    default: 
     return 
}