ios - 更改背景颜色时，CATransaction 持续时间不起作用

Question

func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
    return 10
}

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
    let containerView = transitionContext.containerView
    let toView = transitionContext.view(forKey: .to)!
    let menuView = presenting ? toView : transitionContext.view(forKey: .from)!
    
    containerView.addSubview(toView)
    containerView.bringSubviewToFront(menuView)

    CATransaction.begin()
    CATransaction.setCompletionBlock {
        menuView.layer.backgroundColor = UIColor.red.cgColor
        transitionContext.completeTransition(true)
    }
    CATransaction.setAnimationDuration(self.transitionDuration(using: transitionContext))
    
    menuView.layer.backgroundColor = UIColor.red.cgColor

    CATransaction.commit()
}

我想在导航控制器的过渡动画中使用隐式动画。我想将背景颜色从原来的更改为red. 但是，menuView的颜色会立即更改，并且也会立即调用完成块，而不是在 10 秒后。

知道这里有什么问题吗？