iOS Dropbox Datastore API: WebKit Exception + Unsupported URL - dropbox-api

Question

(Note, this seems related to this question, but is with a different flavor of the Dropbox SDK.)
Using the latest version of the Dropbox Datastore API on iOS, I am getting an exception after performing these steps:
Successfully connect my app to Dropbox
Disconnect my app from Dropbox.
Reconnect app to same, or another, Dropbox account.
Then this happens:
The console in Xcode shows this:
*** WebKit discarded an uncaught exception in the webView:
decidePolicyForNavigationAction:request:frame:decisionListener:
delegate: <NSInvalidArgumentException> -[PilotPro.SettingsTableViewController
dropboxWasLinked:]: unrecognized selector sent to instance 0x7fc489cb94d0
And then this:
[WARNING] DropboxSDK: error loading DBConnectController - Error
Domain=NSURLErrorDomain Code=-1002 "unsupported URL"
UserInfo=0x7fc48c11bc50 {NSUnderlyingError=0x7fc48c4418c0 "unsupported URL",
NSErrorFailingURLStringKey=db-***://1/connect?
oauth_token_secret=***&state=***&oauth_token=***&uid=***,
NSErrorFailingURLKey=db-***://1/connect?
oauth_token_secret=***&state=***&oauth_token=***&uid=***,
NSLocalizedDescription=unsupported URL}
I suspect I am not doing enough to disconnect Dropbox from my account, so it's conflicting with a Dropbox session somehow. Here's what I'm doing to disconnect:
//===::: Disable Dropbox :::===
DBAccountManager.sharedManager().linkedAccount.unlink()
// Shutdown and stop listening for changes to the datastores
DBDatastoreManager.sharedManager().shutDown()
DBDatastoreManager.sharedManager().removeObserver(self)
//Migrate back to local datastores
DBDatastoreManager.setSharedManager(DBDatastoreManager.localManagerForAccountManager(DBAccountManager.sharedManager()))
Any ideas? Thanks in advance.

Answer 1

It turns out that the errors given by Xcode were a bit of a red herring in this case. I was firing an NSNotification after Dropbox finished authenticating, and in doing so I was using this:
NSNotificationCenter.defaultCenter().addObserver(self, selector: "dropboxWasLinked:", name: "dropboxLinked", object: nil)
...but my dropboxWasLinked method wasn't set up to receive any arguments:
func dropboxWasLinked(){ ... }
So Xcode was firing an exception that messed up the authentication and made other things appear to be the cause, when in reality all I needed to do was remove the : from my selector in the NSNotification listener.
Ah, the joys of programming. :)