在XCode 7.0.1中将FB SDK（版本4.7.0）与iOS 9集成时出错：canOpenURL：URL失败：“ fbauth2：/”

Question

I follow the latest instruction at here for integrating FBSDK (Version 4.7.0 downloaded) with my latest XCode. I am pretty sure I have configured the following in info.plist (I only need these for Version 4.7.0 ):

<key>LSApplicationQueriesSchemes</key>
<array>
        <string>fbapi</string>
        <string>fb-messenger-api</string>
        <string>fbauth2</string>
        <string>fbshareextension</string>
</array>

and copied everything as Facebook provided in my Facebook Development account. However, when I tried to login with the Facebook Login Button, I got this error:

canOpenURL: failed for URL: "fbauth2:/" - error: "(null)"

When I see this error, my app just stuck and does not seem to have been authenticated even if I have clicked 'OK' in Safari. I also saw the following as explained by Facebook, but it doesn't make sense to me, as my app remains stuck with this error message.

In iOS 9, the app switches can prompt the user with a confirmation dialog. The SDK will try to minimize the frequency of this by choosing the best dialog available (such as SafariViewController), but this is by design in iOS 9.

Answer 1

I know this may sound silly, but I found the solution, which is not related to the settings in my .plist file. I put the two following functions in my App Delegate, everything works correctly despite of the above warning for fbauth2

func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject?) -> Bool {
        // return FBAppCall.handleOpenURL(url, sourceApplication:sourceApplication, session:PFFacebookUtils.session())
        return FBSDKApplicationDelegate.sharedInstance().application(application,
            openURL: url,
            sourceApplication: sourceApplication,
        annotation: annotation)

    }



    //Make sure it isn't already declared in the app delegate (possible redefinition of func error)
    func applicationDidBecomeActive(application: UIApplication) {
        FBSDKAppEvents.activateApp()
    }