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  1. func update(progress: CGFloat) {
  2.     let height: CGFloat = foregroundButton.bounds.height * progress
  3.     let rect = CGRect(x: 0, y: 0, width: foregroundButton.bounds.width, height: height)
  4.     let path = UIBezierPath(rect: rect).cgPath
  5.     shapeLayer.path = path
  6. }
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