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extension UIView {
  /**
   To setup your rating view, you need to add 5 UIImageViews inside a UIView
   They must be in the "off" state (not filled)
   This method assume it will receive values around 0 to 5,
   being only possible to have values iterating by 0.5.
   E.g: 0, 0.5, 1, 1.5, 2.5...
  */
  func paintStars(rating: Double) {
    let integerRating = Int(rating)
    
    for i in 0..<integerRating {
      if integerRating == 0 {
        return
      }
      (subviews[i] as! UIImageView).image = UIImage(named: "star") //filled star
    }
    
    if rating.truncatingRemainder(dividingBy: 1) != 0 {
      //check if the number is integer
      (subviews[integerRating] as! UIImageView).image = UIImage(named: "star_semi") //half star painted
    }
  }
}