毛玻璃轮子

毛玻璃效果自定义值
class AlphaBlurView: UIVisualEffectView {

private let blurEffect: UIBlurEffect
public var blurRadius: CGFloat {
    return blurEffect.value(forKeyPath: "blurRadius") as! CGFloat
}

public convenience init() {
    self.init(withRadius: 0)
}

public init(withRadius radius: CGFloat,tintColor: UIColor = #colorLiteral(red: 0.07843137255, green: 0.07843137255, blue: 0.07843137255, alpha: 0.9)) {
    let customBlurClass: AnyObject.Type = NSClassFromString("_UICustomBlurEffect")!
    let customBlurObject: NSObject.Type = customBlurClass as! NSObject.Type
    self.blurEffect = customBlurObject.init() as! UIBlurEffect
    self.blurEffect.setValue(1, forKeyPath: "scale")
    self.blurEffect.setValue(radius, forKeyPath: "blurRadius")
    self.blurEffect.setValue(tintColor, forKeyPath: "colorTint")
    self.blurEffect.setValue(1, forKeyPath: "colorTintAlpha")
    super.init(effect: radius == 0 ? nil : self.blurEffect)
}
required public init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

public func setBlurRadius(radius: CGFloat) {
    guard radius != blurRadius else {
        return
    }
    blurEffect.setValue(radius, forKeyPath: "blurRadius")
    self.effect = blurEffect
}

}