Flipped NSString drawing in CGContext

Question

I try to draw a string in this texture:

http://picasaweb.google.it/lh/photo/LkYWBv_S_9v2d6BAfbrhag?feat=directlink

but the green numbers seem vertical flippe

Answer 1

Better save the text 's matrix before draw, otherwise it will affect other text draw by CoreGraphic:

CGContextSaveGState(ctx);
CGAffineTransform save = CGContextGetTextMatrix(ctx);
CGContextTranslateCTM(ctx, 0.0f, self.bounds.size.height);
CGContextScaleCTM(ctx, 1.0f, -1.0f);
[str drawAtPoint:point withFont:font];
CGContextSetTextMatrix(ctx, save);
CGContextRestoreGState(ctx);