UIView button tap animation effect

tapEffect.swift

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
           DispatchQueue.main.async {
               self.alpha = 1.0
               UIView.animate(withDuration: 0.4, delay: 0.0, options: .curveLinear, animations: {
                   self.alpha = 0.5
               }, completion: nil)
           }
       }

       override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
           DispatchQueue.main.async {
               self.alpha = 0.5
               UIView.animate(withDuration: 0.4, delay: 0.0, options: .curveLinear, animations: {
                   self.alpha = 1.0
               }, completion: nil)
           }
       }

       override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
           DispatchQueue.main.async {
               self.alpha = 0.5
               UIView.animate(withDuration: 0.4, delay: 0.0, options: .curveLinear, animations: {
                   self.alpha = 1.0
               }, completion: nil)
           }
       }