UIVisualEffectView subclass that allows to customise effect intensity

CustomIntensityVisualEffectView.swift

// MIT License
// 
// Copyright (c) 2017 Dariusz Rybicki Darrarski
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

import UIKit

final class CustomIntensityVisualEffectView: UIVisualEffectView {
  /// Create visual effect view with given effect and its intensity
  ///
  /// - Parameters:
  ///   - effect: visual effect, eg UIBlurEffect(style: .dark)
  ///   - intensity: custom intensity from 0.0 (no effect) to 1.0 (full effect) using linear scale
  init(effect: UIVisualEffect, intensity: CGFloat) {
    theEffect = effect
    customIntensity = intensity
    super.init(effect: nil)
  }

  required init?(coder aDecoder: NSCoder) { nil }

  deinit {
    animator?.stopAnimation(true)
  }

  override func draw(_ rect: CGRect) {
    super.draw(rect)
    effect = nil
    animator?.stopAnimation(true)
    animator = UIViewPropertyAnimator(duration: 1, curve: .linear) { [unowned self] in
      self.effect = theEffect
    }
    animator?.fractionComplete = customIntensity
  }

  private let theEffect: UIVisualEffect
  private let customIntensity: CGFloat
  private var animator: UIViewPropertyAnimator?
}

Thanks your code :)
Can I use your code in my commercial app?
Please let me know how I can use the code for commercial distribution.

Thanks your code :) Can I use your code in my commercial app? Please let me know how I can use the code for commercial distribution.

@seyoung-hyun you are welcome!

Feel free to use the code in your commercial projects. To avoid confusion, I've added standard MIT licence. It shall be included in all copies or substantial portions of the gist. Cheers!