Question

我有一个模态segue （带有Form Sheet演示文稿），只要选择tableViewCell，我就会调用它。我在故事板中设置了segue，但如果需要，我可以以编程方式设置它。我希望模态视图的背景为Visual Effect View with Blur而不是半透明的黑色。我怎样才能做到这一点？谢谢您的帮助！我正在使用Swift 3。

Answer 1

您可以通过实施两个协议来实现这一目标 - 适用于Animator，<UIViewControllerAnimatedTransitioning>和TransitioningDelegate，<UIViewControllerTransitioningDelegate>。

在Animator中，您需要覆盖方法animateTransition并在那里创建UIVisualEffectView，您将其添加到transitionContext.containerView

class Animator: UIViewControllerAnimatedTransitioning
{
    func blurEffectView(_ transitionContext: UIViewControllerContextTransitioning) -> UIVisualEffectView
    {
        let container = transitionContext.containerView;
        var effectView = objc_getAssociatedObject(container, &BlurEffectViewKey) as? UIVisualEffectView;
        if effectView == nil
        {
            let effect = UIBlurEffect(style: .dark)

            effectView = UIVisualEffectView(effect: effect);
            objc_setAssociatedObject(container, &BlurEffectViewKey, effectView!, objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN);
            container.addSubview(effectView!);
            effectView!.frame = container.bounds;

        }
        return effectView!;
    }

    func animateTransition(using transitionContext: UIViewControllerContextTransitioning)
    {
        ...

        let blurView = self.blurEffectView(transitionContext);

        if (presenting)
        {
            blurView.contentView.addSubview(toController.view);
        }

        ...
    }

    ...
}

然后，您设置并呈现您的模态控制器：

presentedViewController.transitioningDelegate = myTransitioningDelegate
presentedViewController.modalPresentationStyle = .overFullScreen
self.present(presentedViewController, animated:false, completion:nil)

有关详细信息，请参阅WWDC＆＃13; 13会议＆＃34; Custom Transitions Using View Controllers＆＃34;

模态Segue形式板料被弄脏的背景

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