I made the changes for the IOS 7 as stated in your previous comment. But when I tried running with the changes I am not able to see any pdf files in the tableview for the demo project not even the help.pdf file. Is there any other changes I need to do. Kindly let me know for any more changes. I also see there are some 150 warnings while building. I guess that may be the issue.
The help.pdf file only exist when you first time launch the pdfview app on your device or simulator.
If you run app on your device ,you can copy pdf file from iTunes to your device，
If you run it on simulator，you can find the app path on laptop，and copy file to “Document” folder.
/Users/"yourUserName"/Library/Application Support/iPhone Simulator/7.0/Applications/032F5B25-D415-4A9A-9BA0-127A8A34D73B/Document