Method to draw text to the current Core Graphics context (missing vertical alignment ability)

drawText:inFrame:withFont:textColor:alignment:verticalAlignment

- (void)drawText:(NSString *)textToDraw inFrame:(CGRect)frameRect withFont:(UIFont *)originalFont textColor:(UIColor *)textColor alignment:(PDFTextAlignment)alignment verticalAlignment:(PDFTextVerticalAlignment)verticalAlignment {
    
    if (!textToDraw) {
        // If nil, give it an empty value to draw
        textToDraw = @"";
    }
    
    
    // Prepare font
    CTFontRef font = [self ctFontRefFromUIFont:originalFont];
    CGColorRef color = textColor.CGColor;
    
    // Paragraph
    CTTextAlignment ctAlignment;
    switch (alignment) {
        case PDFTextAlignmentLeft:
            ctAlignment = kCTTextAlignmentLeft;
            break;
        case PDFTextAlignmentCenter:
            ctAlignment = kCTTextAlignmentCenter;
            break;
        case PDFTextAlignmentRight:
            ctAlignment = kCTTextAlignmentRight;
            break;
        case PDFTextAlignmentJustified:
            ctAlignment = kCTTextAlignmentJustified;
            break;
        default:
            ctAlignment = kCTTextAlignmentLeft;
            break;
    }
    
    CTParagraphStyleSetting settings[] = {
        {kCTParagraphStyleSpecifierAlignment, sizeof(ctAlignment), &ctAlignment},
    };
    
    CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, sizeof(settings) / sizeof(settings[0]));
    
    // Create an attributed string
    CFStringRef keys[] = { kCTFontAttributeName, kCTForegroundColorAttributeName, kCTParagraphStyleAttributeName };
    CFTypeRef values[] = { font, color, paragraphStyle };
    CFDictionaryRef attr = CFDictionaryCreate(NULL, (const void **)&keys, (const void **)&values,
                                              sizeof(keys) / sizeof(keys[0]), &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

    CFStringRef stringRef = (__bridge CFStringRef)textToDraw;
    // Prepare the text using a Core Text Framesetter.
    CFAttributedStringRef currentText = CFAttributedStringCreate(NULL, stringRef, attr);
    
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString(currentText);
    
    
    CGMutablePathRef framePath = CGPathCreateMutable();
  
    CGPathAddRect(framePath, NULL, frameRect);
    
    // Get the frame that will do the rendering.
    CFRange currentRange = CFRangeMake(0, 0);
    CTFrameRef frameRef = CTFramesetterCreateFrame(framesetter, currentRange, framePath, NULL);
    CGPathRelease(framePath);
    
    // Get the graphics context.
    CGContextRef currentContext = UIGraphicsGetCurrentContext();
    
    // Put the text matrix into a known state. This ensures
    // that no old scaling factors are left in place.
    CGContextSetTextMatrix(currentContext, CGAffineTransformIdentity);
    
    // Core Text draws from the bottom-left corner up, so flip
    // the current transform prior to drawing.
    // Modify this to take into consideration the origin.
    CGContextTranslateCTM(currentContext, 0, frameRect.origin.y*2);
    CGContextScaleCTM(currentContext, 1.0, -1.0);
    
    // Draw the frame.
    CTFrameDraw(frameRef, currentContext);
    
    // Add these two lines to reverse the earlier transformation.
    CGContextScaleCTM(currentContext, 1.0, -1.0);
    CGContextTranslateCTM(currentContext, 0, (-1)*frameRect.origin.y*2);
    
    // TODO: Confirm that everything is released that needs to be!
    CFRelease(frameRef);
    CFRelease(stringRef);
    CFRelease(framesetter);
    CFRelease(font);
    CFRelease(paragraphStyle);
}