Hello !
It was necessary to create / edit the .xls file in an application written in Swift. Google does not save anything. Found the true library of LibXL, but it is only for working with C / C ++, attempts to fasten to Swift failed.
I am considering options with .numbers files, but also without success. CSV is not suitable.
I thought that there would be no problems with this, because the task seems to be not unique.
At the initial stage, you need to at least understand how to add values to the cells.
I ask to help who, what can. Grateful to any information. Thank.