Draw hole on UIBlurEffect

Question

Xcode 8.0 - Swift 2.3
I have an internal extension to create blur layer that works great:

internal extension UIView {
    
    /**
     Add         


        

Answer 1

I've had the same issue in my code. After I applied the mask on the UIView containing UIVisualEffectView, the blur disappeared. However, I could turn it back by overriding the draw method on the parent:

override func draw(_ rect: CGRect) {
    super.draw(rect)
}

I don't know why it works exactly, but hope it will help someone. The code I used to cut the hole out:

private func makeViewFinderMask() -> CAShapeLayer {

    let path = UIBezierPath(rect: bounds)
    let croppedPath = UIBezierPath(roundedRect: viewFinderBounds(), cornerRadius: viewFinderRadius)
    path.append(croppedPath)
    path.usesEvenOddFillRule = true

    let mask = CAShapeLayer()
    mask.path = path.cgPath
    mask.fillRule = kCAFillRuleEvenOdd
    return mask
}