How to make your own ios reader?

Question

iOS

There is a great desire to make your own book reader (the format is unknown, it doesn’t matter), which will simply display the text on the screen and, when you click on any word, it will display its translation into another language (let’s say from English to Russian).
What knowledge and skills do you need to arm yourself with?

Answer 1

js + phonegap is enough for this

Answer 2

Knowledge of Swift and iOS platform + work with book format.