title: UIGraphicsGetCurrentContext vs UIGraphicsBeginImageContext/UIGraphicsEndImageContext
body: <p>I am new to these parts of iOS API and here are some questions that are causing an infinite loop in my mind</p>
  
  <ol>
  <li><p>Why does ..BeginImageContext have a size but ..GetCurrentContext does not have a size? If ..GetCurrentContext does not have a size, where does it draw? What are the bounds?</p></li>
  <li><p>Why did they have to have two contexts, one for image and one for general graphics? Isn't an image context already a graphic context? What was the reason for the separation (I am trying to know what I don't know)</p></li>
  </ol>