iOS10 UIView具有阴影的模糊效果

感谢您的回答。我还找到了另一种解决方案。对于您来说，这并不是一个阴影（没有半径...）：

    override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor = UIColor.clear

    let blurEffect = UIBlurEffect(style: .light)
    let sideEffectView = UIVisualEffectView(effect: blurEffect)
    sideEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]

    sideEffectView.frame = self.view.bounds
    self.view.addSubview(sideEffectView)

    let shadowView = UIView(frame: CGRect(x: 0.0, y: 0, width: self.view.bounds.size.width, height: self.view.bounds.size.height))
    shadowView.translatesAutoresizingMaskIntoConstraints = false
    shadowView.backgroundColor = UIColor.white
    shadowView.layer.masksToBounds = false
    shadowView.layer.shadowOffset = CGSize(width: 2.5, height: 2.5)
    shadowView.layer.shadowOpacity = 1.0
    shadowView.layer.shadowRadius = 2.5

    self.view.insertSubview(shadowView, at: 0)

    // Set constraints programmatically, as this view is animatable
    NSLayoutConstraint(item: shadowView, attribute: NSLayoutAttribute.trailing, relatedBy: NSLayoutRelation.equal, toItem: view, attribute: NSLayoutAttribute.trailingMargin, multiplier: 1.0, constant: 0.0).isActive = true
    NSLayoutConstraint(item: shadowView, attribute: NSLayoutAttribute.top, relatedBy: NSLayoutRelation.equal, toItem: view, attribute: NSLayoutAttribute.topMargin, multiplier: 1.0, constant: 0.0).isActive = true
    NSLayoutConstraint(item: shadowView, attribute: NSLayoutAttribute.bottom, relatedBy: NSLayoutRelation.equal, toItem: view, attribute: NSLayoutAttribute.bottomMargin, multiplier: 1.0, constant: 0.0).isActive = true
    NSLayoutConstraint(item: shadowView, attribute: NSLayoutAttribute.width, relatedBy: NSLayoutRelation.equal, toItem: nil, attribute: NSLayoutAttribute.notAnAttribute, multiplier: 1.0, constant: 5.0).isActive = true
}