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Overview

The Facebook Login SDK exposes two representations of a login outcome:
  • LoginResult — a @frozen Swift enum used by the LoginResultBlock closure. This is the type you receive in the Swift logIn(viewController:configuration:completion:) callback.
  • LoginManagerLoginResult — an NSObject subclass used for Objective-C compatibility and for the LoginManagerLoginResultBlock callback.
Module: FacebookLogin
Declared in: LoginResult.swift, LoginManagerLoginResult.swift

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LoginResult enum

@frozen
public enum LoginResult {
    case success(granted: Set<Permission>, declined: Set<Permission>, token: AccessToken?)
    case cancelled
    case failed(Error)
}

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Cases

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.success(granted:declined:token:)
case
The login completed successfully. Contains the set of granted permissions, the set of declined permissions, and an optional AccessToken. The token is nil when using .limited tracking.
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.cancelled
case
The user dismissed the login dialog without completing the flow.
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.failed(Error)
case
The login attempt encountered an error. The associated value is the underlying Error.

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Pattern matching

loginManager.logIn(viewController: self, configuration: config) { result in
    switch result {
    case let .success(granted, declined, token):
        if granted.contains(.email) {
            print("Email permission granted")
        }
        if let token = token {
            print("Access token:", token.tokenString)
        }
    case .cancelled:
        print("User cancelled login")
    case let .failed(error):
        print("Login error:", error.localizedDescription)
    }
}

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LoginResultBlock type alias

public typealias LoginResultBlock = (LoginResult) -> Void

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LoginManagerLoginResult class

LoginManagerLoginResult is the Objective-C–compatible result type. You receive it in the LoginManagerLoginResultBlock callback used by logIn(permissions:from:handler:) and reauthorizeDataAccess(from:handler:). Objective-C name: FBSDKLoginManagerLoginResult

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Initializer

public init(
    token: AccessToken?,
    authenticationToken: AuthenticationToken?,
    isCancelled: Bool,
    grantedPermissions: Set<String>,
    declinedPermissions: Set<String>
)

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Properties

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token
AccessToken?
The AccessToken granted by the login attempt. This is nil if the login was cancelled, failed, or used .limited tracking.
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authenticationToken
AuthenticationToken?
The AuthenticationToken provided when using .limited tracking (OpenID Connect).
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isCancelled
Bool
true if the user dismissed the login dialog without completing the flow.
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grantedPermissions
Set<String>
The permissions that were granted during this specific login request. Check AccessToken.current?.permissions for the full set of currently-granted permissions.
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declinedPermissions
Set<String>
The permissions that were explicitly declined during this login request.

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Objective-C usage example

// Swift equivalent of the ObjC LoginManagerLoginResultBlock pattern
loginManager.logIn(
    permissions: ["public_profile"],
    from: self
) { result, error in
    if let error = error {
        print("Error:", error)
        return
    }
    guard let result = result, !result.isCancelled else {
        print("Cancelled")
        return
    }
    print("Granted:", result.grantedPermissions)
    print("Declined:", result.declinedPermissions)
}

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Choosing between the two types

ScenarioRecommended type
Swift code using logIn(viewController:configuration:completion:)LoginResult
Objective-C code or legacy Swift using logIn(permissions:from:handler:)LoginManagerLoginResult
Reauthorizing data accessLoginManagerLoginResult via LoginManagerLoginResultBlock

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