gistfile1.m

- (void)drawRect:(CGRect)rect
{
  [super drawRect:rect];
  
  CGRect theRect = rect;
  
  // create a naked string
  NSString *string = self.text;
  
  CGFloat widthValue = 8.0;
  CFNumberRef strokeWidth = CFNumberCreate(NULL,kCFNumberFloatType,&widthValue);
  
  UIFont *uiFont = [UIFont annotationFont];
  CTFontRef font = CTFontCreateWithName((__bridge CFStringRef)uiFont.fontName, uiFont.pointSize, NULL);
  
  
	// pack it into attributes dictionary
	NSDictionary *attributesDict = [NSDictionary dictionaryWithObjectsAndKeys:
                                  (__bridge id)(font), (id)kCTFontAttributeName,
                                  strokeWidth, kCTStrokeWidthAttributeName,
                                  [UIColor blackColor].CGColor, kCTStrokeColorAttributeName,
                                  nil];
  
	// make the attributed string
	NSMutableAttributedString *stringToDraw = [[NSMutableAttributedString alloc] initWithString:string
                                                                                   attributes:attributesDict];
  //set center aligned
  CTTextAlignment alignment = kCTCenterTextAlignment;
  CTLineBreakMode linebreakmode = kCTLineBreakByCharWrapping;
  CTParagraphStyleSetting setting[] = {
    {kCTParagraphStyleSpecifierAlignment, sizeof(alignment), &alignment},
    {kCTParagraphStyleSpecifierLineBreakMode, sizeof(linebreakmode), &linebreakmode}
  };
  CTParagraphStyleRef style = CTParagraphStyleCreate(setting, 2);
  CFRange lastLineRange = CFRangeMake(0, [stringToDraw length]);
  CFAttributedStringSetAttribute((__bridge CFMutableAttributedStringRef)(stringToDraw), lastLineRange, kCTParagraphStyleAttributeName, style);
  
  //vertical align center
  CGRect boundingBox = CTFontGetBoundingBox(font);
  float midHeight = theRect.size.height / 2;
  midHeight -= boundingBox.size.height / 2;
  
	// now for the actual drawing
	CGContextRef context = UIGraphicsGetCurrentContext();
  
	// flip the coordinate system
	CGContextSetTextMatrix(context, CGAffineTransformIdentity);
	CGContextTranslateCTM(context, 0, self.bounds.size.height);
	CGContextScaleCTM(context, 1.0, -1.0);
  
  //draw the text
  CGMutablePathRef path = CGPathCreateMutable(); // 5-2
  CGPathAddRect(path, NULL, CGRectMake(0, midHeight - 1/*Core Text is off by 1 px*/, rect.size.width, boundingBox.size.height));
  //  CGPathAddRect(path, NULL, theRect); // 6-2
  
  CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)stringToDraw); // 7-2
  CTFrameRef theFrame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, [stringToDraw length]), path, NULL); // 8-2
  CFRelease(framesetter); // 9-2
  CFRelease(path); // 10-2
  
  CTFrameDraw(theFrame, context); // 11-2
  CFRelease(theFrame); // 12-2
  CFRelease(strokeWidth);
  CFRelease(font);
  
}