Create your Secrets.h
#ifndef TrayiOS_Secrets_h
#define TrayiOS_Secrets_h
#define DROPBOX_APP_KEY @"<Your Dropbox App Key>"
#define DROPBOX_APP_SECRET @"<Your Dropbox App Secret"
#define ZEROPUSH_APP_TOKEN @"<Your Zeropush App Token>"
#endif
Replace the URL scheme with "db-"
else you will get error like following:
[ERROR] DropboxSDK: unable to link; app isn't registered for correct URL scheme (db-sues46e60vtc5p5)