Custom font not showing diaeresis in capital letters

I solved this problem by following this answer on the question shared by Bob https://stackoverflow.com/a/8314197/617787

The only thing to be aware of this solution (changing the "ascender" of the font file) is that the space between lines on multiline UILabels using this modified font will change as well, so you might use NSAttributedString to modify it in a per case basis.