Can anyone please guide me to create library which aid me to read and write app data in Excel file
Write, Create and Read Excel Files in Swift without using third party library
No such functionalities in Apple's frameworks. Visit Microsoft's site which explains the data format of Excel and do all by yourself (maybe some work of years), or find a third party library.
What OOPer said plus…
The new Tabular Data framework will let you read and write CSV files. That won’t help with Excel files as such, but it might be useful if you can change your requirements slightly (by having folks use Excel to do the Excel-CSV-Excel conversion).
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