title: how to draw the starting degree from 6 o'clock instead of 3 o'clock
body: <p>i refered from this <a href="http://www.thinkandbuild.it/how-to-build-a-custom-control-in-ios/" rel="nofollow noreferrer">example</a></p>
  
  <p>i will like to draw the line from 6 o'clock instead of 3 o'clock</p>
  
  <pre><code>//Create the path
  CGContextAddArc(ctx, self.frame.size.width/2, self.frame.size.height/2, radius, 0, M_PI *2, 0);
  
  //Set the stroke color to black
  
  [[UIColor colorWithRed:241.0/255.0 green:90.0/255.0 blue:36.0/255.0 alpha:1.0]setStroke];
  
  //Define line width and cap
  CGContextSetLineWidth(ctx, TB_BACKGROUND_WIDTH);
  CGContextSetLineCap(ctx, kCGLineCapButt);
  
  //draw it!
  //CGContextDrawPath(ctx, kCGPathFill);
  CGContextDrawPath(ctx, kCGPathStroke);
  </code></pre>
  
  <p>currently
  <img src="https://i.stack.imgur.com/G4FOx.png" alt="enter image description here"></p>
  
  <p>required to be like this drawing from 6 o'clock instead of 3 0'clock
  <img src="https://i.stack.imgur.com/ThWFQ.png" alt="enter image description here"></p>