title: iOS get width height of jpg file
body: <p>In my iOS app, I'm downloading jpeg images from the web, and I'm wondering how to find the correct width and height of the image so I can display it properly in my iOS app. </p>
  
  <p>For example, 
  <br>
  <img src="https://i.stack.imgur.com/tSn63.jpg" alt="enter image description here"></p>
  
  <p>How do I get the width and height of this jpg image?</p>