Hello Brian, I was just curious on a conceptual level are we just throwing the old views (with their data) off the heap each time we do the set up again? Does the dismiss function also toss the current view off the heap? Thank you!

Hi Brain, If i also want to add a check that alerts user they did not choose a profile picture, what to do? Thanks

Hey Brian, After successfuly logging in, the login page dismisses, however it goes back to the previous page (in my case a page that has the option to either login or sign up) as opposed to the MainTabBarController. Any idea why this is happening?

Hi Brian, Why can't we use: MainTabBarController ( ). setupViewsControllers insead of calling UIAppliaction ? I tried and the userview doesn't refresh but I don't know why.

Hi Brian, Do you know what frame or api i can use, if i want to achieve the functionality that send a link through email to users so that they can click and go back to app to reset their password. Or the one which did the similar thing to reset the password.

Hi, I'm very suprised, that we don't need to use lazy vars to access self in closure block, anymore..?!

I want to make the profileImage to profileImage : UIButton instead and execute the upload image function as taught in the SignUpPageViewController. However, present() is only available in UIViewCell or UICollectionViewController. How do I make present() executable in UICollectionViewCell for the UserProfileHeaderViewCell?

Is anyone having an issue with the input accessory view getting stuck at the bottom? When exiting comment screen

when you call mainTabBarController.setupViewControllers() from LoginController and SignUpController why does it work without being forced onto the main thread since setupViewControllers() does UI stuff? Is it because you haven't dismissed the current controller in both cases? Thanks, love the course.

I noticed that when dismissing the LoginController, the app return to a black screen. It seems that this is because the MainTabBarController did not get its viewControllers property set prior to presenting the LoginController. Is that correct? If so, why doesn't you app behave the same?

I noticed that the SignUpController doesn't format correctly in landscape on some phones. There isn't room for all the buttons. What would you normally do this in case? One idea was to not show the plusPhoto in landscape (the user would have to go to portrait if they wanted to set the photo in this case). Another idea was leave in the plusPhoto but to put the stackView of the buttons into a scrollView and allow it to scroll. I realize users probably wouldn't want to sign up in landscape anyway but probably a good practice to handle this rather than leaving what looks like broken UI. Another question is what is a good UX for showing the rules for things like weak passwords and invalid email addresses, etc. In my implementation I've implemented regEx expressions for all three fields and use them from both LoginController and SignUpController (like isEmailValid, isPasswordValid and isUsernameValid). My isFormValid just returns an && of all 3 of these. I suppose I could have an info button to explain the validation rules or pop up a model. Just wondering your thoughts for a good UX design for this. Thanks much. Love the course.

How can the components be reused, for example, the stack view with the text fields and the button without repeating the code?

Would it be possible to store the User somewhere centrally? Since all views/components will potentially need access to the current user. When the current user changes, all underlying views/components have access to the updated data in User. (I'm coming at it from a web development perspective so I'm not sure if it works the same way in iOS)

Hi Brian, When checking if there is an existing user, right now its in the maintabbarcontroller so when we launch the app, I can see the userprofilecontroller gets loaded first then the loginController is presented (when the user is logged out). Wouldn't it be better to put this inside appdelegate and use an if statement to know which one to display? If its done like this, will there be any changed needed in the code for login/signup (presenting the VC part)? Thanks.

Hello sir , I want to customize dialog pop up style with adding any controls can u show me please

To access "setupViewControllers" func of "mainTabBarController", you wrote : guard let mainTabBarController = UIApplication.shared.keyWindow?.rootViewController as? MainTabBarController else { return } cant we simply change " func setupViewControllers" to " static func setupViewControllers" ? Wouldn't it be easier?

Hello Brianvoong, Great tutorial. Instead of print statement in login and signUp controllers can you please show proper way of error handling. other thing is showing activity indicator in login and signup process. Thanks.

Hi Brian, quick question; min 11.42: Can't we just store a reference to collectionView in userProfileViewController in loginViewController and just call collectionView.reloadData() when dismissing the loginViewController?

Great Lesson - Learning so much

Brian, when I make my millions I will be sure to break you off a piece!

Hey Brian, How to match/change the color of the top notch area with the first view. The notch area always takes the default view color. e.g.If we have a video player, just below the notch area (following safeAreaLayoutGuid), how to make the notch area black in color. Please, help me out here.

Hi, Brian! I am trying to set a UserDefaults variable after dismissing the LoginController. It saves and I can access it when I get back to MainTabBarController. However, when I close the app and come back again, the user default no longe exists. Do you know there is any problem with the threads when setting a user default value in the completion handler?

Hello Brian: Do you know how to get the Fire base error code back, so i can test against it, and show a custom error message accordingly. if i print the error i get this : Error Domain=FIRAuthErrorDomain Code=17009 "The password is invalid or the user does not have a password." UserInfo={NSLocalizedDescription=The password is invalid or the user does not have a password., error_name=ERROR_WRONG_PASSWORD}

I was about to ask why don't we just "present" the appropriate view controller when logging in / logging out but then I found this Reddit post: https://www.reddit.com/r/swift/comments/817mgv/dismiss_vs_present_view_controller/ But I have a slightly different app structure than the InstagramFirebase app: When a user is not logged in (check performed in MainTabBarController), I want to display a landing page where you will see the first half part of the View to be a collectionView scrolling horizontally and the other half part to contain 2 buttons: 1 for registration and 1 for login. This way we will have the MainTabBarController as rootViewController, then (if the user is not logged in), we will go to LandingPageController, then we will click on Login button and go to LoginController. The questions is: How do I dismiss both LoginController and LandingPageController before moving to MainTabBarController as a logged in user? Cheers!

Hi Brian, To be honest I'd say there is a huge design flaw here. Every time a user log out and log back in (or sign up), a new UserProfileController with NavController will spawn. I've checked the mem address of each NavControllers - they are all different. We should either reuse the original ones or destroy them to prevent memory leaks since they're not accessible any longer. To my understanding, get things done correctly is the most important thing to an engineer. And I really don't think you'll make such a mistake in your daily job since you're a lead engineer. There's no way such code can pass code review. I hope there will be an updated version of the code which would have a correct design with controller flow.

How can we update the user profile picture once we're in the app?

Hi guys, I had a problem where the LoginController would not deallocate when dismissed. My app structure is somewhat different (i like the iOS Spotify app structure better). The only difference, is that, i like to separate view elements from the view controller (Brian taught me that also!). Doing that created a retain cycle that would not allow LoginController to be deallocated. You can find more about this to my StackOverflow question (and answer) here: https://stackoverflow.com/questions/51051838/swift-presenting-modally-and-dismissing-a-navigation-controller/51078752#51078752 Now i feel ready to move forward to the next lesson! :) Damn OCD!!!

Hi guys! Instead of using the UIApplication.shared.keyWindow?.rootViewController as? MainTabBarController I notify the MainTabBarController setupViewControllers() using NSNotificationCenter. It seems that everything works as intended but which approach is better?

Hi, Brian is it right to check if user logged in from appDelegate.swift ?? Thanks for your awesome videos BTW.

I am half way through this episode. I am able to display user id as navigation item title. But The profile photo and the username are not showing up. I printed those values in setupProfileImage(). It is showing <<null>>

Hi Brian, I have a problem upon logging in. The error message is "libc++abi.dylib: terminating with uncaught exception of type NSException"; Thread 2: signal SIGABRT I've tried cleaning my code but to no avail. Kindly advise thanks

Hi Brian, I have a question: Why we don't have to encrypt username and password before we send it to Firebase? Please help, thanks:)

Hi Brian, can we sign in using username rather than using email? Thanks!

Hi Brian, instead of using dismiss() once the user successfully logged in, can we use present() to present the viewController and avoid the use of UIApplication.shared.keywindow.rootViewController ? I'm asking because I can't figure out how to implement your technique with my app where my RootVC is a UICollectionView embeded in a navigationController. And using present() seems to work fine. Thank you very much

Hey Brian, I remember you discussed how to remove unnecessary statements from the console, but I don't know in which video. Could you please refer me. Would be big help. Thanks.

Hi Brian, is possible to include a video on the section of the Login with FaceID please. Thanks for an amazing training

Hey Brian, at 9:30, why was the black screen showed up?

how do i solve this error...libc++abi.dylib: terminating with uncaught exception of type NSException (lldb) ? I have the exact same code..

Really good stuff.

Hi Brian, I have a problem here with adding photo to a new user in here .. when a photo is taken from the device the frame is not a circle anymore .. though i didn't change the code .. plusePhotoButton.layer.cornerRadius = plusePhotoButton.frame.width / 2 plusePhotoButton.layer.masksToBounds = true I think it's because we changed the anchor but I don't know how to fix it

Hi Brain, I am currently using the fetchUser() function for every time I need to get user data like first name, last name, and other information stored in the database. I want to set a global variable containing the user's database information so that I can easily fill in the UILabels with the correct value. (like first name etc). I cannot find a way to save the information as global...

Hi, all! If you have some problem with MainTabbarController when he disappears, after first login in app, the next code will help you fix that bug. override func viewWillAppear(_ animated: Bool) { super.viewDidAppear(animated) if Auth.auth().currentUser == nil { //show if not logged in DispatchQueue.main.async { let loginController = LoginController() let navController = UINavigationController(rootViewController: loginController) self.present(navController, animated: true, completion: nil) } return } setupViewControllers() } override func viewDidDisappear(_ animated: Bool) { super.viewDidDisappear(animated) if let vcs = viewControllers { for (_,vc) in vcs.enumerated() { vc.view.removeFromSuperview() } } } I hope that help.

Brain, when we created our UserProfileController in mainTabBarController.setupViewControllers() in function handleLogin, Are we creating memory leaks? I can call deinit in UserProfileController but he never calling. Could you help me to undestand this.

Hi brian, how do i fix this, it says that keyWindow was deprecated in iOS 13.0. Help

How do I access mainTabBarController.setupViewControllers() with let window = UIApplication.shared.windows.filter {$0.isKeyWindow}.first

When I log in as an existing user, the username and profile picture does not show up in the header, but shows the long unique identifier. But when I sign up as a new user, the username and picture comes up. How can I get the username and profile picture to show up when I log in as an existing user?

For iPhoneXs+ is there a way to have the logoView anchor to the safeAreaLayouts and set the background color of the notch area to the blue color?

If you want to read more about retain cycles and delegate pattern then this article is a great resource: https://medium.com/anysuggestion/preventing-memory-leaks-with-swift-compile-time-safety-49b845df4dc6

I am trying to build this project and it fails, one of the first issues is Swift 5 conversion. It can't convert due to syntax errors.

Brian, For the KeyWindow issue do you replace: guard let mainTabBarController = UIApplication.shared.keyWindow?.rootViewController as? MainTabBarController else { return } with let window = UIApplication.shared.windows.filter {$0.isKeyWindow}.first

I got passed the KeyWindow error but the project still does not run. I run it and the screen goes white, then black.

Hi Brain, When I add : guard let mainTabBarController = UIApplication.shared.keyWindow?.rootViewController as? UITabBarController else { return } mainTabBarController.setupViewControllers() it shows an error that 'keyWindow' was deprecated in iOS 13.0: Should not be used for applications that support multiple scenes as it returns a key window across all connected scenes. This is not work for me, and I still have the problem of login with a new user but show the previous user information. Can u please tell me what wrong with it? Thanks!