How to open csv/excel file from ios application

Hello ,
I am working on importing data into csv file in ios .
I have created csv file under specialfolder.documents folder.
Now I need to open created file on button action event.
Can anyone tell me how to open file in ios ?
Thanks in advance.

TextInputStream, as usual

Thankx michel for quik reply but I want to ‘open’ means I need to show/launch created file .