Objective-C

@protocol FIRAuthUIDelegate <NSObject>

Objective-C

@protocol FIRFederatedAuthProvider <NSObject>

/**
    The type of block invoked when obtaining an auth credential.
    @param credential The credential obtained.
    @param error The error that occurred if any.
 */
typedef void(^FIRAuthCredentialCallback)(FIRAuthCredential *_Nullable credential,
                                         NSError *_Nullable error)
                                             NS_SWIFT_NAME(AuthCredentialCallback);

#if TARGET_OS_IOS
/**
    Used to obtain an auth credential via a mobile web flow.
    @param UIDelegate An optional UI delegate used to presenet the mobile web flow.
    @param completion Optionally; a block which is invoked asynchronously on the main thread when
        the mobile web flow is completed.
 */
- (void)getCredentialWithUIDelegate:(nullable id<FIRAuthUIDelegate>)UIDelegate
                         completion:(nullable FIRAuthCredentialCallback)completion;
#endif  // TARGET_OS_IOS

@end

Objective-C

@protocol FIRUserInfo <NSObject>