如何在带阴影的UIView上做模糊效果？如果我这样做:overridefuncviewDidLoad(){super.viewDidLoad()//Doanyadditionalsetupafterloadingtheview.letlayer=self.view.layer;layer.shadowColor=UIColor.black.cgColorlayer.shadowOpacity=1.0layer.shadowOffset=CGSize(width:0.0,height:0.5)layer.shadowRadius=5.0self.view.backgroundColor=