If youre looking for Sinhala system keyboard for iOS8
Please check Black Keys app from us
http://itunes.apple.com/app/id899894778
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Typing in Sinhala and quick copy to your App
You can also share image and Sinhala text to Facebook,Twitter from this App
Please video tutorial on youtube for more details:
https://www.youtube.com/watch?v=za2oHn_5E6s