内部的SKAction.sequence和SKAction.sequence都没有运行

Question

我对此代码有点问题。在didMove里面，我正在调用运行良好的SKAction.sequence，并创建了怪物。

但是我希望能够删除这些怪物，并且在一段时间后无法恢复。

我正在调用addMonster（）函数，在其中我有一个SKaction.sequence调用淡出并删除怪物。它似乎无法运行......

override func didMove(to view: SKView) {

     run(SKAction.repeatForever(
        SKAction.sequence([
            SKAction.run(addMonster),
            SKAction.wait(forDuration: 5.0)
            //SKAction.run(addMonster),
            ])
    ))
}

func addMonster() {

    let monster = Enemy(enemySpriteName: "triangle", name: enemyName, 
    position: CGPoint(x: background.position.x + 300 + CGFloat(enemycount), 
    y: background.position.y + 50 + CGFloat(enemycount)), zPosition: 9)
     self.addChild(monster)
//This part doesn't seem to run ?!
    let scale = SKAction.scale(to: 0.1, duration: 2.5)
    let fade = SKAction.fadeOut(withDuration: 3.5)
    let actionMoveDone = SKAction.removeFromParent()
    monster.run(SKAction.sequence([scale, fade,  actionMoveDone]))
}