UIVisualEffectView+EffectColor.swift

extension UIVisualEffectView {
  var effectColor: UIColor? {
    get {
      return self.colorEffectView()?.backgroundColor
    }
    set {
      self.colorEffectView()?.backgroundColor = newValue
    }
  }
  private func colorEffectView() -> UIView? {
    return self.subviews.lazy.filter { (view) -> Bool in
      return NSStringFromClass(view.dynamicType) == "_UIVisualEffectFilterView"
      }.first
  }
 }