I am designing an ios app which collects the user data and saves the data into a .txt file. I am currently using the sandbox in organizer in xcode to download these files. However, I want the users who do not have xcode to access these files as well.
So are there any ways that I can download these files either via USB, or via FTP to a server, or via iCloud, or via Bluetooth, or via WIFI?
iTunes File Sharing would probably be the easiest method of getting files out of your app. You basically just add the UIFileSharingEnabled key to your app's Info.plist, then save the file to the sandbox's ~/Documents/ directory.
Here's a tutorial if you want a more in-depth discussion of how to use file sharing.