Question

I’m using the iOS Dropbox SDK and want to check if my App is already linked with a Dropbox account. So I do:

if (self.isLinked) {
    NSLog(@"linked");
}

However self.isLinked always returns YES. Even after cleaning and resetting the iPhone Simulator.

---

This only occurs when running in the iOS simulator not on a real device. I don’t know why this happens, but the Dropbox SDK on the Simulator also is linked if its host Mac is linked with a Dropbox account.

To get realistic behavior in the Simulator unlink your Mac in the Dropbox Preferences.

Answer 1

Sometime in mid-2012 (can’t find the iOS SDK version log) the Dropbox iOS SDK behaviour changed to retain ‘link’ status through uninstall/reinstall of an app (even on device). As a result, apps that perform some action on receiving the ‘linked’ callback (like mine) would not work after a reinstall.

One solution is to unlink on first-run. Something like so:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    if ([[NSUserDefaults standardUserDefaults] objectForKey:HAS_RUN_KEY] == nil)
    {
        // ensure you have a DBSession to unlink
        if ([DBSession sharedSession] == nil)
        {
            DBSession* dbSession = [[[DBSession alloc] initWithAppKey:DROPBOX_KEY appSecret:DROPBOX_SECRET root:kDBRootAppFolder] autorelease];
            [DBSession setSharedSession:dbSession];
        }

        // unlink
        [[DBSession sharedSession] unlinkAll];

        // set 'has run' flag
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:HAS_RUN_KEY];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
}