Flutter Facebook auth through FB application (if installed) not through a WebView - flutter

I am currently integrating Facebook login through the flutter_facebook_auth package in Flutter.
If I am currently having Facebook application installed on iOS, then login through Facebook in my application it should follow the flowing scenario:
If the Facebook application is already installed, when clicking the Facebook login, Facebook application should pop up.
Else if we don't have Facebook application, it should divert to a WebView.
It's working this way on Android but on iOS only opens in WebView even if FB application is installed. How to do this for iOS?

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Flutter LinkedIn auth through LinkedIn application (if installed) not through a WebView

I am currently integrating LinkedIn login through the linkedin_login package in Flutter. If I am currently having LinkedIn application installed on mobile (Android or iOS), then login through LinkedIn in my application, it should follow the flowing scenario:
If the LinkedIn application is already installed, when clicking the LinkedIn login, LinkedIn application should pop up.
Else if we don't have LinkedIn application, it should divert to a WebView.
How to do this?
Right now, it only authenticates through a WebView even if LinkedIn application is installed.

Yammer login to web app not working on Iphone

Recently i registered app on yammer to use yammer for login to my web app. There is a problem on iOS with this flow, because when i try to login I get mobile yammer app login pop up & after that it only opens yammer app, and no redirection to my web app actually happens.
This only happens on iphone, on all other devices it works, on android also works with yammer app installed. Somebody familiar with this ?

How to authenticate user using facebook native app during login with facebook JS SDK

Our website is using Login with facebook feature and working fine for desktop and mobile browser.The requirement is , on a mobile device if facebook app is installed then authenticate using facebook app rather than mobile browser
FB Community question link.
I think for doing this you will have to use facebook sdk for android so that you can use the native facebook authentication form
This link may be useful :
https://developers.facebook.com/docs/facebook-login/android

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I am having a iOS AddThis SDK issue with the facebook functionality, If the user deathorizes the app on Facebook, the AddThis SDK does not properly notify me via the iOS app to handle that disconnect. This leads the app user to get an error in the facebook SDK that is un "trappable" by the developer when they try to go and share again after having disconnected the app.
Is there anyway to have the AddThis SDK pass such a message or SDK state back to the app so we can reauthorize the user to connect their facebook account to the facebook app within the iOS app?