CHBgDropboxSync is a free and open source Objective-C library designed to help iOS developers build apps capable of background syncing the contents of a folder to Dropbox.
Performs a 2-way sync process designed to either download or upload changes as necessary. Uses the NSUserDefaults to keep track of local files to help it decide whether to delete or transfer if a file is present one one side but not on the other.
To use this, add the Dropbox API to your app as you normally would, creating an interface to link (and unlink) as normal. Use this class to sync a local folder (typically your Documents folder in an iOS app) to your app's folder on Dropbox in the background without user intervention.
Detailed instructions on how to use the CHBgDropboxSync Objective-C library within your own iOS apps are available HERE.
· Apple Xcode