title: Finding the position of a button. CGRectMake
body: <p>I have a button and I'm using <code>CGRectMake</code> to position it like this:</p>
  
  <pre><code>btn5.frame = CGRectMake(211, 280, 109, 60);
  </code></pre>
  
  <p>I guess <code>211</code> and <code>280</code> are the coordinates of the button. So how can I modify that code if I want the button to be near the bottom left corner.</p>