Unable to Login as Different User After Logging out of iOS application - ios

Question

So here is my problem. I log in to my application, then log out of my application, but when I try to log in again, I get the screen in the link below.
Login Screen
As you can see, I don't get the opportunity to login with another user, which is what is intended.
What I tried to do was logout and then clear all the cookies in the logout using these following methods:
#IBAction func logout(sender: AnyObject) {
//Logged out here
let loginManager = FBSDKLoginManager()
loginManager.logOut()
//This is one method I tried
let appDomain = NSBundle.mainBundle().bundleIdentifier!
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain)
//This is another method I tried
for key in NSUserDefaults.standardUserDefaults().dictionaryRepresentation().keys {
NSUserDefaults.standardUserDefaults().removeObjectForKey(key)
}
//And this is the last method I tried
var cookie: NSHTTPCookie
var storage: NSHTTPCookieStorage = NSHTTPCookieStorage.sharedHTTPCookieStorage()
for cookie in storage.cookies! {
var domainName: String = cookie.domain
var domainRange: Range = domainName.rangeOfString("facebook")
if domainRange.length > 0 {
storage.deleteCookie(cookie)
}
}
}
None of these seemed to solve my problem. The app is in "Development" mode in the Facebook Dev account so it might have something to do with this, but not totally sure. Does someone have any experience with this and know the solution to our problem, as shown in the image above.

Answer 1

The whole goal of Facebook login is to allow quick, seamless login into your Facebook account without having to re-enter credentials.
To achieve this, the Facebook SDK tries to leverage credentials that are already stored on the device, which may include:
login information from the Facebook app
cookies related to Facebook login in Safari (directly or via the SFSafariViewController)
system Facebook accounts
When you logout, you actually only have the Facebook SDK forget the credentials within the app (it clears the token). When you login again, it acts like the first time you did, and if it finds an existing user, it will use that (the Facebook SDK makes the — usually valid — assumption that there is a single person using the device, and they have a single Facebook account).
The current "favorite" path for the Facebook SDK (though that varies with SDK versions, iOS versions, and possibly other parameters) is SFSafariViewController, which shares cookies with Safari, not with your app.
If you want the user to completely log out on the device, they would then have to use the log out link within Facebook in Safari (or an SFSafariViewController).
If you want to do so programatically, you may open the following URL in Safari or an SFSafariViewController:
https://www.facebook.com/logout.php?next=[YourAppURL]&access_token=[ValidAccessToken]
You'll have to use a custom URL scheme to return to your app/exit the SFSafariViewController, though.

Answer 2

If you, as a user, want to see permissions request from Facebook again, you should remove the app from user's profile on Facebook.
When you are at settings screen, find your app and hit the cross button