贡献作者 -【XJDomain】
博客XJ: https://my.oschina.net/shengbingli/blog
GitHub直播地址: https://github.com/lishengbing/XJDomainLive

使用:

createFrostBackground(img: imageV.image!,view: self.view)

方法：

extension ViewController {
    //创建毛玻璃效果的背景
    func createFrostBackground (img:UIImage,view:UIView) {
        let w = self.view.frame.width
        let h = self.view.frame.height
        let blurImageView = UIImageView(frame: CGRect(x: -w/2,y: -h/2,width: 2*w,height: 2*h))
        // let blurImageView = UIImageView(frame: CGRect(x: 0,y: 0,width: w,height: h))
         //模糊背景是界面的4倍大小
        blurImageView.contentMode = .scaleAspectFill
        blurImageView.image = img
        //创建毛玻璃效果层
        let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .light)) as UIVisualEffectView
        visualEffectView.frame = blurImageView.frame
        //添加毛玻璃效果层
        blurImageView.addSubview(visualEffectView)
        self.view.insertSubview(blurImageView,belowSubview: view)
    }
}