skemitternode与skspritenode的冲突

Question

我在swift中有以下两个函数用于SKEmitterNode和SKSpriteNode之间的碰撞检测但是每当我的粒子发射器和精灵碰撞时我都会得到一个dynamicCastFailed异常：

func projectileDidCollideWithMonster(projectile:SKEmitterNode, monster:SKSpriteNode) {
        println("Hit")
        projectile.removeFromParent()
        monster.removeFromParent()
    }

func didBeginContact(contact: SKPhysicsContact) {

    // 1
    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
    }

    // 2
    if ((firstBody.categoryBitMask & PhysicsCategory.Monster != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.Projectile != 0)) {
            projectileDidCollideWithMonster(firstBody.node as SKEmitterNode, monster: secondBody.node as SKSpriteNode)
    }

}

是否可以使SKEmitterNodes与SKSpriteNodes发生冲突，或者这不起作用？

Answer 1

你的身体已经切换了。我相信它应该是这样的：

projectileDidCollideWithMonster(secondBody.node as SKEmitterNode, monster: firstBody.node as SKSpriteNode)