let blureffect=UIBlurEffect(style: UIBlurEffectStyle.Light); let blurView = UIVisualEffectView(effect: blureffect) //设置
效果视图
类实例的尺寸 blurView.frame.size = CGSize(width: view.frame.width,height: view.frame.height) //将模糊
效果视图
类实例放入背景中 bg.addSubview(blurView)