如何在SpriteKit中更改变量之前创建延迟

Question

我正在创建一个涉及玩家使用加电的游戏。每当播放器选择激活通电时，都会运行此功能。它将玩家的图像改变为使用加电的玩家的图像，并改变碰撞物理，使玩家现在对敌人免疫。

只要变量powerActivated为1，它就会这样做，但是，正如您所看到的，它会直接返回到0。我需要它延迟5-10秒，然后转到0。这将允许用户在powerUp消失之前使用几秒钟。

 func superAbility(){

        powerActivated = 1

        if powerActivated == 1 {

        player.texture = SKTexture(imageNamed: "heroWithPower")
        player.physicsBody!.categoryBitMask = PhysicsCategories.PowerUp
        player.physicsBody!.collisionBitMask = PhysicsCategories.None
        player.physicsBody!.contactTestBitMask = PhysicsCategories.Enemy

        // delay should be here

        powerActivated = 0

        }

        else {
            player.texture = SKTexture(imageNamed: "hero")
            player.physicsBody!.categoryBitMask = PhysicsCategories.Player
            player.physicsBody!.collisionBitMask = PhysicsCategories.None
            player.physicsBody!.contactTestBitMask = PhysicsCategories.Enemy

        }

Answer 1

使用SKAction来创建延迟，这样你就可以在游戏时间内等待，而不是实时等待，这样任何外部电话操作都不会破坏你的游戏。

func superAbility(){

        player.texture = SKTexture(imageNamed: "heroWithPower")
        player.physicsBody!.categoryBitMask = PhysicsCategories.PowerUp
        player.physicsBody!.collisionBitMask = PhysicsCategories.None
        player.physicsBody!.contactTestBitMask = PhysicsCategories.None //I think you meant to set this to none to be immune to enemies

        let deactivateAction = SKAction.run{
            [unowned self] in
            self.player.texture = SKTexture(imageNamed: "hero")
            self.player.physicsBody!.categoryBitMask = PhysicsCategories.Player
            self.player.physicsBody!.collisionBitMask = PhysicsCategories.None
            self.player.physicsBody!.contactTestBitMask = PhysicsCategories.Enemy
        }
        let wait = SKAction.wait(forDuration:5)
        let seq = SKAction.sequence([wait,deactivateAction])
        player.run(seq, withKey:"powerup")
}