How do I upload a file to my dropbox apps folder in dropbox in objective c?

The nonce should just be any random string, which should only be used once. You can get the current timestamp however you wish.

Also, for what it's worth, if it saves you some trouble, since you just need the one account, I believe you can supply any arbitrary string for userID in the updateAccessToken method. (I can't promise that will always work though.)

Finally, I recommend getting your account linked properly first, but there are a few things that might cause your delegate methods to not be called:

1. Your rest client is nil or is being released (e.g., by ARC) prematurely.
2. You're making the call in a background thread that doesn't have a run loop.
3. Your delegate method that should be called back has a typo in it. Unfortunately the SDK doesn't warn you if it can't find a delegate method to call; it just completes without telling anyone.

Be sure to check your console for any errors though.