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How to Make an Ebook Reader App: Quick Overview
Making an ebook reader app connects a publication with the way a person reads it. Chapters and text belong to the book; font size, bookmarks, and reading position describe the reader’s experience. Displaying the cover is only the catalogue view.
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Download on the App Store ↗Larger text changes where a page ends
A reader increasing the text size may see fewer words on each screen. In a reflowable book, the same passage can therefore appear on a different screen page. A remembered location has meaning beyond a displayed page number.
A publication and its rendering are different
W3C’s EPUB reading-system specification distinguishes reflowable content from fixed layouts. That distinction explains why ebook readers combine navigation, document rendering, and personal reading state rather than treating every book as a stack of pictures.
The book and the reading position have different lifetimes
A book provides content and structure, while a reading position records where someone currently is within it. Changing the font size can alter visible page breaks without changing the underlying text. That makes a screen page an imperfect description of a permanent location.
Bookmarks, highlights, and reading preferences also belong to a person's experience of the book. They need an understandable relationship to the content they refer to. This connects a reader app with document structure, display preferences, and saved personal state.
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