title: Drawing rotated text with NSString drawInRect
body: <p>I found this answer on how to draw rotated text with NSString drawInRect:, but I'm not sure how it works since it only sort of works for me: <a href="https://discussions.apple.com/thread/1779814?start=0&amp;tstart=0" rel="noreferrer">https://discussions.apple.com/thread/1779814?start=0&amp;tstart=0</a></p>
  
  <p>My code looks like:</p>
  
  <pre><code>           CGContextSaveGState(context);
             CGContextDrawLinearGradient(context, gradient, CGPointMake(0, centY - halfWidth), CGPointMake(0, centY + halfWidth), 0);
  
              // Add text                
              CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor); 
              NSString *str = @"some test string";
  
              CGAffineTransform transform1 = CGAffineTransformMakeRotation(M_PI/4);
  
              CGContextConcatCTM(context, transform1);
              CGContextTranslateCTM(context, 0, 0);
              UIFont *font = [UIFont systemFontOfSize:16.0];
  
              [str drawInRect:CGRectMake(0, 0, 200, 100) withFont:font lineBreakMode:UILineBreakModeWordWrap alignment:UIBaselineAdjustmentNone];
  </code></pre>
  
  <p>So when I use this, I see text being drawn 45 degrees below the x-axis.  I want to draw the text vertically along my lineargradient.  So I thought I could do that by using M_PI/2 for 90 degrees.  I do not see my text though.  I have tried different transforms for the rotation, and only some seem to work like M_PI/4 and M_PI/8.  I would think that if I used -M_PI/4 it would have the text 45 degrees above the x-axis and M_PI/2 would be 90 degrees below the x-axis.  But both turn up with nothing.  </p>
  
  <p>Any thoughts?  thanks.</p>