title: Glow effect to custom UIButton like info UIButton
body: <p>As I am new in iphone development. I want to give glow effect like "info UIButton" to  "custom UIButton".</p>
  
  <p><img src="https://i.stack.imgur.com/KodKd.png" alt="enter image description here"> --> <img src="https://i.stack.imgur.com/5pY0z.png" alt="enter image description here"></p>
  
  <p>Please help me in this case, to give the above effect on button tap.</p>