iPhone - How to draw text in the middle of a rect

Question

Is there a method to draw text in the middle of a rectangle. I can find various alignments, but nothing I have tried can vertically centre the text in a rect.

Is there a simple method to do this, or is there some way to centre a rectangle and then draw in that?

I'm drawing direct to the CGContext, trying to use NSString::drawWithRect or something similar, as I dont really want to have to add a Label just to render some basic text.

Answer 1

Well, the font property pointSize corresponds directly to the height in pixels of a NSString drawn in that UIFont, so your formula would be something like this:

- (void) drawString: (NSString*) s             withFont: (UIFont*) font               inRect: (CGRect) contextRect {      CGFloat fontHeight = font.pointSize;     CGFloat yOffset = (contextRect.size.height - fontHeight) / 2.0;      CGRect textRect = CGRectMake(0, yOffset, contextRect.size.width, fontHeight);      [s drawInRect: textRect           withFont: font      lineBreakMode: UILineBreakModeClip          alignment: UITextAlignmentCenter]; } 

UITextAlignmentCenter handles the horizontal centering, so we use the full width of the contextRect. The lineBreakMode can be whatever you like.