How to display a Sinhala keyboard on Mac book
Please tell me or tell me that how can I download fm abaya font on apple iPad or iPad air
You can add fonts to an ios device using an app like AnyFont.
But such fonts can only be used in app with a font menu like Pages. You cannot change the system font.
Apple only supports Unicode Sinhala. So if that font is a legacy, non-unicode font, it will probably not work at all.
You should have no problem reading and writing Unicode Sinhala with the keyboards and fonts already included in your device.
Add or change keyboards on iPad - Apple Support