Inlucde this JavaScript file in your iOS Apps index.html and call the linkDropbox() function to start the Dropbox link process.

dropbox.js

function linkDropbox(){ // start the Dropbox link process, make a button call this function on click
    cordova.exec(linkDropboxCB, linkDropboxFail, "PhoneGapDropBox", "link", [""]);
}

function linkDropboxCB(){ // this callback fires if the link method in PhoneGapDropbox.m is successful
    console.log("link method in PhoneGapDropbox.m executed successfully");
}

function linkDropboxFail(err){ // this fail callback fires if the link method in PhoneGapDropbox.m fails
    console.log("linkDropboxFail() - error message is below");
    console.log(err);
}

function authDropboxFinished(){ // this will be called from AppDelegate.m once Dropbox has linked & authenticated
    window.localStorage.setItem("authDropbox", "true"); // setting local storage variable noting this app has linked with Dropbox
    console.log("app successfully linked and authenticated with dropbox");
    // At this point you can start making Dropbox API calls - will need to call more methods in PhoneGapDropbox.m to upload/download
}