Braille practicing (Cantonese version) for iOS

A Training App made for normal or even low vision people to pratice the basics of Cantonese brailleMethod of training:-Listen a part of Cantonese phonics, then type out that braille symbol.Features:-Color keys are adopted to low vision people-Buttons number and color modes are helpful for people to understand the structure of Braille.The objectives:-Helping low vision people to practice the Cantonese Braille, and let normal people to understand the form of it.