Apple ibooks supports pdf and epub.
Now you can also download a txt reader from the appstore. If you want to see txt, you can go to' qq Reading'. After QQ reading, install XXX iPhone column on the left side of itunes, then find the program above, and then pull it to the bottom to find the file * * * to enjoy it. Click QQ to read and add.
I hope I can help you.
Hope to adopt