Adjust NSVisualEffectView blur radius and transparency

Question

Is it possible to adjust the blur radius and transparency of an NSVisualEffectView when it\'s applied to an NSWindow (Swift or Objective-C)? I trie

Answer 1

I had the same issue as you had and I have solved it with a little trick seems to do the job that I wanted. I hope that it will also help you.

So in my case, I have added the NSVisualEffectView in storyboards and set its properties as follows:

and my View hierarchy is as follows:

All that reduces the blur is in the NSViewController in:

override func viewWillAppear() {
    super.viewWillAppear()
    //Adds transparency to the app
    view.window?.isOpaque = false
    view.window?.alphaValue = 0.98 //tweak the alphaValue for your desired effect
}

Going with your example this code should work in addition with the tweak above:

    let blurView = NSVisualEffectView(frame: view.bounds)
    blurView.blendingMode = .behindWindow
    blurView.material = .fullScreenUI
    blurView.state = .active
    view.window?.contentView?.addSubview(blurView)

Swift 5 code For anyone interested here is a link to my repo where I have created a small prank app which uses the code above: GitHub link