Opening a Facebook group page in the Facebook app on the iPhone using Swift is really easy. I’m using Swift 5 and Xcode 11.6.
You must need your Facebook Page integer id which looks like this 8794208798015.
let fbPage = "fb://profile/" + FB_GROUP_ID // Your Facebook group id e.g 8794808798015
let fbURL = URL(string:fbPage)
let canOpenURL = UIApplication.shared.canOpenURL(fbURL!)
if (canOpenURL) {
UIApplication.shared.open(fbURL!, completionHandler: nil)
}Also update your Info.plist file otherwise you will get error like this
