title: How to make pencil stroke for iPhone app?
body: <p>I would like to make a pencil stroke in an iPhone application, which can draw lines such as you can see in this picture:</p>
  
  <p><img src="https://i.stack.imgur.com/skcEz.jpg" alt="enter image description here"></p>
  
  <p>Can anybody show me how I could implement these types of stroke?</p>