Implementing Share on iOS 11

First,

Share with SLComposeViewController is no longer implemented.

It is not very accurate that
If you have the official Twitter or Facebook app installed, it seems that you can also post using the SLComposeViewController on iOS 11.

(*However, as of iOS 11beta8, when I try to post on Twitter, I get an alert saying "I don't have a Twitter account".If you log in on the Twitter app, you can post even if you get an alert.)

The following options are available for posting when the official app is not installed.

• Twitter Official Migration Guide: Migrating from iOS Social Framework
• FacebookSDK:Facebook SDK Start Guide for iOS

• Twitter:https://twitter.com/intent/tweet?text=...
• Facebook: https://www.facebook.com/dialog/share?app_id=...&href=...

• You can determine whether the app is installed or not by checking "twitter://" or "fb://" with the UIAapplication canOpenURL.

Both methods 1 and 2 require application registration on the Facebook Developer Page.

Please refer to it.