Application
In a project, several ViewController manage the data in a singleton pattern to access one piece of data, without any database or server interface.
Bookstore Game
It is intended to learn about "How to manage a data when a project needs access to one data from multiple view controllers." In conclusion, I've resolved using Singleton patterns.
System Diagram
Menu Diagram
Publication of a book
You can write your own book. Published books are registered in bookstores and sold by the librarians.
Book search
The author can check his books, and the librarian can search the list of books that are registered in the bookstore by "book name" or "author name"
Book sales
The books that are registered at the bookstore are sold by librarians, and the number of books sold will decrease and can be sold further by the age of 0 books. If the author reproduces a book that has sold out, the number of books available will increase.
Search All Books
The librarian can look up the whole number of books that are registered in the bookstore.
Screenshots
Take a look at the app by its screenshots
My efforts were rewarded
What I learned through this project