iOS app进入后台毛玻璃效果

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直接上代码

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func applicationDidBecomeActive(_ application: UIApplication) {
    if let visualEffectView = self.visualEffectView {
        UIView.animate(withDuration: 0.5, animations: {
            visualEffectView.alpha = 0
        }, completion: { (_) in
            visualEffectView.removeFromSuperview()
        })
    }
}

weak var visualEffectView: UIVisualEffectView?
func applicationWillResignActive(_ application: UIApplication) {
    let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.light)
    let visualEffectView = UIVisualEffectView(effect: blurEffect)
    visualEffectView.alpha = 0
    visualEffectView.frame = self.window?.frame ?? CGRect.zero
    self.window?.addSubview(visualEffectView)
    self.visualEffectView = visualEffectView
    UIView.animate(withDuration: 0.5) {
        visualEffectView.alpha = 1
    }
}

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