Dropbox API on iOS fails to link - ios

Question

I'm unable to get my app to link to dropbox on iOS.
I create the session and ask if it's linked... if no, it opens up Dropbox to get authorization. I say yes, and it returns to my app and sends a notification to start the upload.
But isLinked is still NO, so the file fails to upload if I try. Any advice is appreciated.
Interestingly, the -sessionDidReceiveAuthorizationFailure: userId: delegate method is never called.
-(void)connectToDropbox{
if (!dbSession) {
dbSession = [[DBSession alloc] initWithAppKey:#"key"
appSecret:#"secret"
root:kDBRootDropbox];
dbSession.delegate = self;
[DBSession setSharedSession:dbSession];
}
if ([[DBSession sharedSession] isLinked]) {
[self beginUpload:nil];
} else {
[[DBSession sharedSession] linkFromController:self.currentViewController];
}
}
- (void)beginUpload:(NSNotification *)note {
if (![[DBSession sharedSession] isLinked]) {
NSError * error = [NSError errorWithDomain:#"myApp"
code:0
userInfo:#{NSLocalizedDescriptionKey : #"Could not link to Dropbox"}];
[[NSNotificationCenter defaultCenter] postNotificationName:kErrorDidOccurNotification object:error];
NSLog(#"File upload failed with error: %#", error);
return;
}
///do the upload if we make it here.
}
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation NS_AVAILABLE_IOS(4_2){
if ([sourceApplication isEqualToString:#"com.getdropbox.Dropbox"]) {
[[NSNotificationCenter defaultCenter] postNotificationName:#"beginDropboxUpload" object:nil];
}
/// more code
}

Answer 1

Your code in the app delegate isn't correct. You need something like this:
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation NS_AVAILABLE_IOS(4_2) {
if ([[DBSession sharedSession] handleOpenURL:url]) {
NSString *query = url.query;
if ([[url absoluteString] rangeOfString:#"cancel"].location == NSNotFound) { // NO_I18N
[[NSNotificationCenter defaultCenter] postNotificationName:#"beginDropboxUpload" object:nil];
} else {
// Link cancelled
}
} else {
// Something other than Dropbox
}
}