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Víctor Gonzal
Asked: 2020-02-17 17:07:50 +0800 CST 2020-02-17 17:07:50 +0800 CST

Activate authentication provider in FirebaseLoginViewController

  • 772

I am trying to use FirebaseLoginViewControllerto be able to authenticate my users. At the moment the code is like this:

import UIKit

class AccesoPrincipal : FirebaseLoginViewController{


var loginViewController : FirebaseLoginViewController?
var loginButton : FirebaseLoginButton?
var logoutButton : FirebaseLoginButton?

override func viewDidLoad() {
    super.viewDidLoad()

    let firebaseRef = Firebase(url: "https://superapp.firebaseio.com/")

    self.loginViewController = FirebaseLoginViewController(ref: firebaseRef)
    self.loginViewController!.enableProvider(FAuthProvider.Facebook)
    //self.loginViewController.enableProvider(FAuthProvider.Google)
    //self.loginViewController.enableProvider(FAuthProvider.Twitter)
    self.loginViewController!.enableProvider(FAuthProvider.Password)


    // Scenario 2: Set up user action based login flow
    loginButton!.addTarget(self, action: "login", forControlEvents: UIControlEvents.TouchUpInside)
    logoutButton!.addTarget(self, action: "logout", forControlEvents: UIControlEvents.TouchUpInside)
}


// Scenario 2: User action launches login flow, dismissal and routing handled by `FirebaseLoginViewController`
func login() {
    if ((self.loginViewController!.currentUser() == nil)) {
        self.presentViewController(self.loginViewController!, animated: true, completion: nil)
    }
}

override func logout() {
    if ((self.loginViewController!.currentUser()) != nil) {
        self.loginViewController!.logout()
        }
    }
}

When I run the application I get the following error code:

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Please enable at least one authentication provider in your FirebaseLoginViewController'

2016-02-16 19:39:57.725 MyApp[3623:91775] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Please enable at least one authentication provider in your FirebaseLoginViewController'
*** First throw call stack:
(
    0   CoreFoundation                      0x01138a14 __exceptionPreprocess + 180
    1   libobjc.A.dylib                     0x0429ee02 objc_exception_throw + 50
    2   CoreFoundation                      0x0113893d +[NSException raise:format:] + 141
    3   MyApp                    0x001b18f4 -[FirebaseLoginViewController viewDidLoad] + 292
    4   MyApp                    0x0005b7a5 _TFC16MyApp15AccesoPrincipal11viewDidLoadfS0_FT_T_ + 85
    5   MyApp                    0x0005bd32 _TToFC16MyApp15AccesoPrincipal11viewDidLoadfS0_FT_T_ + 34
    6   UIKit                               0x01fdd2ae -[UIViewController _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 44
    7   UIKit                               0x01fe1dce -[UIViewController loadViewIfRequired] + 1384
    8   UIKit                               0x01fe21ed -[UIViewController view] + 35
    9   UIKit                               0x01e8ff94 -[UIWindow addRootViewControllerViewIfPossible] + 69
    10  UIKit                               0x01e906b1 -[UIWindow _setHidden:forced:] + 304
    11  UIKit                               0x01e90a67 -[UIWindow _orderFrontWithoutMakingKey] + 49
    12  UIKit                               0x01ea4118 -[UIWindow makeKeyAndVisible] + 80
    13  UIKit                               0x01e0c6e7 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4190
    14  UIKit                               0x01e13cd6 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1989
    15  UIKit                               0x01e38ee5 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke3218 + 68
    16  UIKit                               0x01e10966 -[UIApplication workspaceDidEndTransaction:] + 163
    17  FrontBoardServices                  0x06377c76 __37-[FBSWorkspace clientEndTransaction:]_block_invoke_2 + 71
    18  FrontBoardServices                  0x0637774d __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 54
    19  FrontBoardServices                  0x06395173 -[FBSSerialQueue _performNext] + 184
    20  FrontBoardServices                  0x063955aa -[FBSSerialQueue _performNextFromRunLoopSource] + 52
    21  FrontBoardServices                  0x063948a6 FBSSerialQueueRunLoopSourceHandler + 33
    22  CoreFoundation                      0x010526ff __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
    23  CoreFoundation                      0x0104838b __CFRunLoopDoSources0 + 523
    24  CoreFoundation                      0x010477a8 __CFRunLoopRun + 1032
    25  CoreFoundation                      0x010470e6 CFRunLoopRunSpecific + 470
    26  CoreFoundation                      0x01046efb CFRunLoopRunInMode + 123
    27  UIKit                               0x01e10206 -[UIApplication _run] + 540
    28  UIKit                               0x01e15bfa UIApplicationMain + 160
    29  MyApp                    0x00060f0c main + 140
    30  libdyld.dylib                       0x04d0ba21 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

I understand that the error is because an authentication provider has not been detected, however, that part is defined within the viewController, isn't it? There isn't much documentation FirebaseUIso it's been hard to find anything about it.

swift

1 Answers

  1. Best Answer

    After reviewing the code, I tell you the error. The main problem is that you declared it AccesoPrincipalas a subclass of , FirebaseLoginViewControllerand it was instantiated directly without the necessary parameters. To solve it, I have modified the code so that it looks like this:

    import UIKit

class AccesoPrincipal : UIViewController {

    var loginViewController : FirebaseLoginViewController?

    override func viewDidLoad() {
        super.viewDidLoad()


        let firebaseRef = Firebase(url: "https://puertomapp.firebaseio.com/")

        self.loginViewController = FirebaseLoginViewController(ref: firebaseRef)
        self.loginViewController!.enableProvider(FAuthProvider.Facebook)
        self.loginViewController!.enableProvider(FAuthProvider.Password)

    }


    @IBAction func login() {
        if ((self.loginViewController!.currentUser() == nil)) {
            self.presentViewController(self.loginViewController!, animated: true, completion: nil)
        }
    }

}

    I also leave you the modified code, since I have added the button that opens the login screen. Here it is: https://www.dropbox.com/s/jamv2eo40ixjf2k/PuertoMorelosApp_Modificada.zip?dl=0

    • 2