Hai Brian, just curious why you just use self.posts.reversed, instead insert at index? Is the reversed it take more memory than insert at index?

Owww, yeah i forgot that observasion is running multiple time, thank u Brian

I think an "error handling" video would be very helpful. For example if there isn't any internet what displays, etc. Lovin the class!

Hi Brian, when you jump between controller in the tabBar and finally you open User Profile controller. Once all the photos fetched from the firebase db, they are appearing straight away which is not beautiful at all, may be there is a way to animate them when image is loaded? Question is: Where should we apply this animation? Thanks

Hello Brian, say you wanted to fetch posts in the feed, but with a condition... Only users that have for ex: "FirebaseUser" as a username. How can iterate and set a condition to post only users with the above username? i tried if loop, it wokred but fetched repeated posts and for loop i got no luck with it. Thanks alot, brian.

Hi brian, I have a question on AttributedString. Is SF Pro Display the systemFont? If not, how do I use it? Do I still need to add it considering its apple's font? How do change the font and weight in the NSAttributedStringKey declaration (say SF Pro Display using semibold). I tried looking for it online but all I'm getting are old versions and couldn't get it to work when I try it. Thank you.

Hi Brian! There is an error occurring on my app that apparently doesn't occur on yours and i don't understand why. As i have two UICollectionViews in my app, one in the homeController and one in the UserProfileController, when i scroll down the first collectionview and during the scroll i tap on the userProfileController tab, there is a confusion happening between the two collectionViews and they mix up their cells.. I don't know how to explain it well, but the UI of the two collectionViews are mixing up badly and that destroys the UI, maybe it's because of the reuse feature of the collectionView, so when i switch to the userProfile, the second collectionView reuse the cell from the first collectionView or something like that. So i tried to set different cellIdentifier for the two collectionViews but it still happens Do you have any idea of the origin of this problem? Did this ever happened to you? Thanks for your consideration, and keep up doing your work, you're the best teacher i've ever had in my swift developer life, the videos are super easy to follow and i really feel improving my development skills in each video :)

Hi Brian, after implementing the user inside of the Post(user: User, dictionary: [String: Any]) constructor and after replacing the Post(dictionary: dictionary) to Post(user: User, dictionary: [String: Any]) inside each fetch function, I happen to get a bug where I can't see my UserProfileController's grid images anymore. Everything else is fine, but that. So i tried going back a step and deleting the Post(user: User, dictionary: [String: Any]) back to Post(dictionary: dictionary) and I can see the grid images again. I don't know why it's doing this.

i'm in episode 22 and it worths each dollar i've paid

When going to user profile,collection view reload inside fetch ordered post method not triggering.But if you put breakpoint on method reload happening and cells are displayed.Pretty strange

How do you fetch each post that has been posted in the database?

Hi Brian, the function fetchPosts() in HomeFeedController doesn't seem to work , photos are not in right order and it uploads not immediately after user select photo also after dissmising viewcontroller , I tried childAdded it works great but as you sad later on it causes us a bug. What should I do to fix that can you please answer ?

Does anyone know why the fetchOrderedPosts() function doesn't show the posts once you change the initialization from Post(dictionary: dictionary) to Post(user: User, dictionary: [String: Any])? I believe the problem has something to do with the previous line "guard let user = self.user else { return }", but I can't seem to figure out why since the navigationTitle is showing an username. Any help would be greatly appreciated.

Hi Brian, My UserProfileController no longer seems to be displaying when I select it. But, my HomeController and PhotoSelector tabs work, and after checking your source code, I am struggling to figure out what the cause could be. Could you please suggest what the issue could be, or how to resolve this? Thanks