快速UIVisualEffectView与UIBlurEffect不工作

Question

单击浮动操作按钮后，我正在尝试显示UIView。有一次，我点击了显示内容视图所需的浮动操作按钮。现在，如果我尝试应用blur effect，它就不起作用了。

这里是我的代码：

fileprivate var parentView: UIView!

self.parentView = view
self.items = items
let bounds = self.parentView.bounds

self.contentView = UIView(frame: bounds)
self.blurVisualEffect = UIVisualEffectView(effect: UIBlurEffect(style: .extraLight))
self.blurVisualEffect.frame = self.contentView.frame
self.contentView.addSubview(self.blurVisualEffect)

样本输出

Answer 1

尝尝这个

let blurEffect = UIBlurEffect(style: .extraLight)
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = self. parentView.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.contentView.addSubview(blurEffectView)