毛玻璃效果

func bulrEffectFunction() {
let blurEffect: UIBlurEffect = UIBlurEffect.init(style: .light)
let effectView: UIVisualEffectView = UIVisualEffectView.init(effect: blurEffect)
effectView.frame = CGRect.init(x: 0, y: 0, width: img_w, height: img_h)
effectView.alpha = 0.7
imageView.addSubview(effectView)
}
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