iOS - Problems connecting from own app to Dropbox when Dropbox App is installed

Question

Dear community,
&nbsp;
since a few days I have the following strange situation.
&nbsp;
I have developed an app for iOS which can store data on the Dropbox. The connection is set up as described in the manuals with the right settings in info.plist and the SceneDelegate (see below).
&nbsp;
Everything works fine as long as the Dropbox app is not installed on the device. As soon as the Dropbox app is on the device my app doesn't get a &nbsp;connection to the dropbox to exchange data. When launching my app it calls Dropbox to ask if I allow the access of my app. As soon as I confirm this, the return to my app doesn't work properly and the connection breaks. It seems that the &nbsp;DropboxClientsManager.authorizedClient is not properly set.
The error is reproducible - removing Dropbox app: all works, installing Dropbox app: problem is there.
&nbsp;
Does anyone have an idea, what I can do to fix it? I would assume that I have to change some settings?
My current settings are:
info.plist:
&lt;key&gt;LSApplicationQueriesSchemes&lt;/key&gt;
&lt;array&gt;
&lt;string&gt;dbapi-8-emm&lt;/string&gt;
&lt;string&gt;dbapi-2&lt;/string&gt;
&lt;/array&gt;
&lt;key&gt;CFBundleURLTypes&lt;/key&gt;
&lt;array&gt;
&lt;dict&gt;
&lt;key&gt;CFBundleURLName&lt;/key&gt;
&lt;string&gt;&lt;/string&gt;
&lt;key&gt;CFBundleURLSchemes&lt;/key&gt;
&lt;array&gt;
&lt;string&gt;db-**************&lt;/string&gt;
&lt;/array&gt;
&lt;/dict&gt;
&lt;/array&gt;
&nbsp;
and in the&nbsp;sceneDelegate:
// MARK: - Dropbox
&nbsp; &nbsp; func scene(_ scene: UIScene, openURLContexts URLContexts: Set&lt;UIOpenURLContext&gt;) {
&nbsp; &nbsp; &nbsp; &nbsp; if let url = URLContexts.first?.url {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; let oauthCompletion: DropboxOAuthCompletion = {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if let authResult = $0 {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; switch authResult {
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case .success:
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("Success! User is logged into DropboxClientsManager.")
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case .cancel:
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("Authorization flow was manually canceled by user!")
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case .error(_, let description):
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("Error: \(String(describing: description))")
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DropboxClientsManager.handleRedirectURL(url, completion: oauthCompletion)
&nbsp; &nbsp; &nbsp; &nbsp; }
&nbsp; &nbsp; }
&nbsp;
&nbsp;
Thanks for your support
Regards gcarl

Greg-DB · Answer

Thanks for the report! Can you also share:

the code you're using to start the authorization flow
whether or not you also have the non-scenes "Handle redirect back into SDK" code added
the version number of the Dropbox SDK
the version number of the Dropbox iOS app
the version number of iOS

muthulingam · Answer

Hi Sir,i am facing the similar issue .....&nbsp;&nbsp;1) if "dropbox" app was already installed, then as per the documents, "This launches the official Dropbox iOS app (if installed), authenticates via the official app, then redirects back into the SDK" ... but it does not happens&nbsp;2) if "dropbox" app was not installed, then there is no problem.(it shows the Authentication screen)&nbsp;-&gt;&gt; i followed exact steps which you guys are described in the tutorials ...&nbsp; (thats why it is working for "non Dropbox app installed" iOS devices.&nbsp;here is the code snippets related to authentication workflow&nbsp;in AppDelegate.m&nbsp; (in objective c)&nbsp;- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{&nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; [PhotoPickerEngine.sharedEngine setupSocialNetworks];}- (BOOL)application😞UIApplication *)app openURL😞NSURL *)url options😞NSDictionary&lt;UIApplicationOpenURLOptionsKey,id&gt; *)options{NSString *urlString = [[[url absoluteString] componentsSeparatedByString:@":"] objectAtIndex:0];if ([urlString isEqualToString:@"db-xxxxxxxxxx”]){[PhotoPickerEngine.sharedEngine handleRedirectURLWithUrl:url]; //dropbox to handle&nbsp;}}&nbsp;&nbsp;//swift code&nbsp;@objc public func setupSocialNetworks(){ &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp;DropboxClientsManager.setupWithAppKey(“APP_KEY”)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;}&nbsp;@objc public func handleRedirectURL( url: URL) {&nbsp;&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; DropboxClientsManager.handleRedirectURL(url, completion: { (authResult) in&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; switch authResult {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case .success(let token):&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("Success! User is logged into Dropbox with token: \(token)")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; EventHub.post(DropboxLoginEvent())&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; UserDefaults.standard.set(token.accessToken, forKey: Constants.keyAccessTokenDropbox)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case .cancel:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("User canceld OAuth flow.")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case .error(let error, let description):&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print("Error \(error): \(String(describing: description))")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; case .none:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; break&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; })&nbsp; &nbsp; }&nbsp;&nbsp;&nbsp; the version number of the Dropbox SDK&nbsp; &nbsp; : 6.0.3&nbsp; the version number of the Dropbox iOS app : 258.2.2&nbsp; the version number of iOS : 15.0.1&nbsp;can you please help me how to fix this issue?&nbsp;Thanks ,muthulingam&nbsp;&nbsp;

Greg-DB · Answer

[Cross-linking for reference: https://github.com/dropbox/SwiftyDropbox/issues/345 ]
&nbsp;
muthulingam Thanks for the report. I just tried reproducing this with the same version of the Dropbox SwiftyDropbox SDK and Dropbox app, but it worked successfully for me. My test device is on iOS 15.0.2 though, so it may be worth updating your iOS installation to see if that helps.
&nbsp;
Can you elaborate on what you mean when you say "but it does not happens"? What output/error do you get?
&nbsp;
By the way, the latest version of the Dropbox SwiftyDropbox 8.2.0. I recommend updating to that, and updating your code to the latest version of the authorization flow as documented.

gcarl · Answer

I'm using the following authorization flow, my App is set up in Dropbox with a permanent token:

DropboxClientsManager.authorizeFromController(UIApplication.shared, controller: self, openURL: {(url: URL) -> Void in UIApplication.shared.open(url, options: [:], completionHandler: nil)})

I tried it with your alternative authorization flow as published too, but the result is the same.

The newest SDK version, I can install via cocoaPod is 7.0.1. Astonishingly I can either install version 8.2.0 via CocoaPods ( pod 'SwiftyDropbox', '>=8.0.0' creates an error, only

pod 'SwiftyDropbox', '>=7.0.0' works and leads to 7.0.1) nor via Swift Package Manager with the published link (the link is not found).

iOS-Version is 15.0

Greg-DB · Answer

gcarl While either should technically work, you should use the newer "authorizeFromControllerV2" method as shown here, instead of "authorizeFromController". Is that what you're referring to when you say "alternative authorization flow"?
&nbsp;
In any case, I've been unable to reproduce the issue in my own testing, even with the same version of the SDK. You didn't mention which version number of the Dropbox iOS app you have installed though, so please do share that. You can find it in the settings section of the app.
&nbsp;
Also, when you run in to this issue, do you get any error or output, such as in the UI or in the Xcode console?
&nbsp;
Finally, I also can't reproduce the SDK installation issues you mentioned. If you're still seeing those, can you share the full error/output for those?

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