Placing curved text on an UIImage

gistfile1.m

NSArray* sections = [[NSArray alloc] initWithObjects:@"text1", @"text2", @"text3", @"text4", nil];

- (UIImage*) createMenuRingWithFrame:(CGRect)frame
{
    // First fix the frame to make sure it uses the right scaling (iPhone 4 / iPad compatibility).
	frame = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width * scale, frame.size.height * scale);

    // Same for the text radius
	float scaledTextRadius = textRadius * scale;
	float scaledRingWidth = ringWidth;

    // Define the centerpoint of the circle.
	CGPoint centerPoint = CGPointMake(frame.size.width / 2, frame.size.height / 2);

    // self.menuItemsFont is of the type UIFont, which I use to get the font for displaying the text on the circle.
	char* fontName = (char*)[self.menuItemsFont.fontName cStringUsingEncoding:NSASCIIStringEncoding];

    // 2 UIColor's, which I need for the color of the circle and for the text
	ringColor = [UIColor colorWithRed:1 green:1 blue:1 alpha:0.7];
	textColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:1];

	CGFloat* ringColorComponents = (float*)CGColorGetComponents(ringColor.CGColor);
	CGFloat* textColorComponents = (float*)CGColorGetComponents(textColor.CGColor);

	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(NULL, frame.size.width, frame.size.height, 8, 4 * frame.size.width, colorSpace, kCGImageAlphaPremultipliedFirst);

	CGContextSetTextMatrix(context, CGAffineTransformIdentity);

	CGContextSelectFont(context, fontName, 18 * scale, kCGEncodingMacRoman);
	CGContextSetRGBStrokeColor(context, ringColorComponents[0], ringColorComponents[1], ringColorComponents[2], ringAlpha);
	CGContextSetLineWidth(context, scaledRingWidth);

	CGContextStrokeEllipseInRect(context, CGRectMake(scaledRingWidth, scaledRingWidth, frame.size.width - (scaledRingWidth * 2), frame.size.height - (scaledRingWidth * 2)));
	CGContextSetRGBFillColor(context, textColorComponents[0], textColorComponents[1], textColorComponents[2], textAlpha);

	CGContextSaveGState(context);
	CGContextTranslateCTM(context, centerPoint.x, centerPoint.y);

    // define the angles of the texts to divide them evenly on the circle.
	float angleStep = 2 * M_PI / [sections count];

    // I set the starting-angle on 90 degrees, to make sure the first text was ON TOP of the circle.
	float angle = degreesToRadians(90);

    // Some custom text-radius fixing (and scaling for iPhone 4 & iPad). To make sure my text centered nicely.
	scaledTextRadius = scaledTextRadius - 12 * scale;

    // Loop through texts and draw them at the appropriate angle.
	for (NSString* text in sections)
	{
        // call a method that actually draws the text at an angle
		[self drawStringAtContext:context string:text atAngle:angle withRadius:scaledTextRadius];
		angle -= angleStep;
	}

	CGContextRestoreGState(context);

	CGImageRef contextImage = CGBitmapContextCreateImage(context);

    // Release the stuff to avoid memory leaks.
	CGContextRelease(context);
	CGColorSpaceRelease(colorSpace);

    return [UIImage imageWithCGImage:contextImage];

}

// This method draws the text at an angle, while the location is based on the radius + angle.
- (void) drawStringAtContext:(CGContextRef) context string:(NSString*) text atAngle:(float) angle withRadius:(float) radius
{
	// Scale the fontsize to match UIScreen scaling
	UIFont* scaledMenuItemsFont = [menuItemsFont fontWithSize:18 * scale];

	// Get the size of the string when it would be drawn with the selected font
	CGSize textSize = [text sizeWithFont:scaledMenuItemsFont];

	float perimeter = 2 * M_PI * radius;

	// determine the angle of the text.
	float textAngle = (textSize.width) / perimeter * 2 * M_PI;
	angle += textAngle / 2;

	// We loop through each letter in the string, so we can set the angle for each letter right
	for (int index = 0; index < [text length]; index++)
	{
	    // Get the correct letter by the index
		NSRange range = {index, 1};
		NSString* letter = [text substringWithRange:range];
		char* c = (char*)[letter cStringUsingEncoding:NSASCIIStringEncoding];
		CGSize charSize = [letter sizeWithFont:scaledMenuItemsFont];

	    // Determin the X and Y position of the letter based on the angle and the radius
		float x = radius * cos(angle);
		float y = radius * sin(angle);

		float letterAngle = (charSize.width / perimeter * -2 * M_PI);

	    // Save the state of the context, because rotations are based on the original origin
		CGContextSaveGState(context);
		CGContextTranslateCTM(context, x, y);
	    // Rotate the canvas so we can just draw our text horizontally
		CGContextRotateCTM(context, (angle - 0.5 * M_PI));
		CGContextShowTextAtPoint(context, 0, 0, c, strlen(c));
	    // Restore the context again.
		CGContextRestoreGState(context);

		angle += letterAngle;
	}
}

Hello there, I'd like to use your code to curve text. However, I'm not quite sure how to implement your code and make it work. Where should I put "NSArray* sections = [[NSArray alloc] initWithObjects:@"text1".... " into? Into Viewdidload? gistfile1.h file?