ios - 以编程方式模糊 Pop Over 后面的背景 View

Question

我有一个 View Controller (PopOverViewController)被另一个 View Controller (ListViewController)实例化。

在 ListViewController内，PopOverViewController 以模态方式呈现:

popOverVC = self.storyboard?.instantiateViewController(withIdentifier: "sbPopUpID") as! PopUpViewController

popOverVC.modalPresentationStyle = .fullScreen

在 PopOverViewController内，PopOverViewController 通过 CGAfflineTransformation 进行动画输入/输出:

    func showAnimate()
{
    self.shadowView.transform = CGAffineTransform(scaleX: 0.7, y: 0.7)
    self.view.alpha = 0.0;
    UIView.animate(withDuration: 0.3, animations: {
        self.view.alpha = 1.0
        self.shadowView.transform = CGAffineTransform(scaleX: 0.7, y: 0.7)
    });
}

func removeAnimate()
{
    UIView.animate(withDuration: 0.3, animations: {
        self.shadowView.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
        self.view.alpha = 0.0;
    }, completion:{(finished: Bool) in
        if (finished)
        {
            self.view.removeFromSuperview()
        }
    });
}

在PopOverViewController的viewDidLoad中，背景颜色调低:

self.view.backgroundColor = UIColor(white: 0, alpha: 0.7)

我的问题: 当 PopOver 呈现时，由于 PopOver 的 Alpha，背景仍然可见。我想在呈现 PopOver 时模糊此背景，并在关闭 PopOver 时使模糊消失。

我对如何做到这一点感到困惑。

谢谢!

swift 3

Answer 1

private func makeEffectView() {
        let effect: UIBlurEffect = UIBlurEffect(style: UIBlurEffectStyle.light)
        effectView = UIVisualEffectView(effect: effect)
        effectView.frame = CGRect(x:0, y:0, width:UIScreen.main.bounds.size.width, height:UIScreen.main.bounds.size.height)
        self.window?.addSubview(effectView)
    }



private func removeEffectView() {
        if effectView != nil {
            self.effectView.removeFromSuperview()
        }
    }