Vertical align with Core Text?

Question

How do I change the vertical alignment of the text in a CTFramesetter frame? I want my text to be in the middle instead of being at the top. I am using Core Text framework. There is a setting of the paragraph to change horizontal aligment but not vertical.

Answer 1

Finally figured it out ...

CGRect boundingBox = CTFontGetBoundingBox(font);

//Get the position on the y axis
float midHeight = self.frame.size.height / 2;
midHeight -= boundingBox.size.height / 2;

CGPathAddRect(path, NULL, CGRectMake(0, midHeight, self.frame.size.width, boundingBox.size.height));

Answer 2

Thanks Nick, that was a great snippet.

Just expanding on that, if your doing Top, Middle and Bottom alignment with an enum, for example you could do it like so:

if (VerticalAlignmentTop == currentTextAlignment) {
    CGPathAddRect(path, NULL, rect); // Draw normally (top)
}
else if (VerticalAlignmentMiddle == currentTextAlignment) {
    CGRect boundingBox = CTFontGetBoundingBox(fontRef);

    //Get the position on the y axis (middle)
    float midHeight = rect.size.height / 2;
    midHeight -= boundingBox.size.height / 2;

    CGPathAddRect(path, NULL, CGRectMake(0, midHeight, rect.size.width, boundingBox.size.height));  
}
else {
    CGRect boundingBox = CTFontGetBoundingBox(fontRef);

    CGPathAddRect(path, NULL, CGRectMake(0, 0, rect.size.width, boundingBox.size.height));  
}