A-VibrancyView 是 iOS 模糊和镂空透明层。示例代码：
vibrancyView.presentEffect() //Dispaly Light blur style with 0.5 second animation vibrancyView.presentEffect(.Dark, animationDuration: 0) //Dsipaly Dark blur style with no fade aniamtion vibrancyView.convertAllSubview() // Convert all subview to cut-out transparent vibrancyView.recoverAllSubview() // Recovert all cut-out transparent in this vibrancy view vibrancyView.alphaOfEffect = 0.1 // Set alpha of blur effect layer
