Less Blur with `Visual Effect View with Blur`?

Question

Title pretty much asks it all...

I\'m playing with the iOS8 Visual Effect View with Blur. It\'s over a UIImageView that shows a user choosa

Answer 1

A solution similar to some here, but simpler, is to use a UIViewPropertyAnimator (iOS 10+) and set its fractionComplete property to some value between 0 and 1.

    // add blur view to image view
    let imgBlur = UIVisualEffectView()
    imgView.addSubview(imgBlur)
    imgBlur.frame = imgView.bounds

    // create animator to control blur strength
    let imgBlurAnimator = UIViewPropertyAnimator()
    imgBlurAnimator.addAnimations {
        imgBlur.effect = UIBlurEffect(style: .dark)
    }

    // 50% blur
    imgBlurAnimator.fractionComplete = 0.5

Note, if you plan to vary fractionComplete based on a pan gesture, scroll view, slider, etc. you'll want to set pausesOnCompletion = true (iOS 11+).