模态 Segue 表单工作表模糊背景

Posted 2023-02-23

【中文标题】模态 Segue 表单工作表模糊背景

【英文标题】：Modal Segue Form Sheet Blurred Background

【发布时间】：2017-06-20 18:25:32

【问题描述】：

I have a modal segue (with the Form Sheet presentation) which I call whenever a tableViewCell is selected.我在情节提要中设置了 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是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。

【参考方案1】：

您可以通过实现两个协议来做到这一点 - 对于您的 Animator、<UIViewControllerAnimatedTransitioning> 和对于 TransitioningDelegate、<UIViewControllerTransitioningDelegate>。

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

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，您设置并展示您的模态控制器：

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

更多详细信息，请参考 WWDC'13 session "Custom Transitions Using View Controllers"