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Hey guys this is Caleb with Dev slopes and in this video we're going to write a function that's going

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to convert our unique ID into a username or an email for our user.

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We're also going to configure the cells so that they appropriately show the username the way they're

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supposed to.

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And we're also going to change our messages array so that the feed shows in reverse.

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So the most recent post cell will show up at the very top and it's super easy to do that just to show

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you what I mean in the feed.

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The last post that I made is at the bottom we're going to set it up so that it actually goes to the

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top.

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And it's really easy.

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So let's actually start by doing that first because that's where we left off last time.

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It's literally like six letters or less or more like seven letters.

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Anyway what we need to do is the array that is returned from get all feed messages.

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We're going to actually call a function on this array.

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I actually had no idea that this was a thing and I was planning on having to write some big fancy function

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to reverse the order of the array.

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But all you lil all you need to do is literally type dot reversed.

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That's it.

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This is going to take the array and it's going to flip everything.

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And that way we can show the most recent post at the very top.

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I'm not kidding you it is that easy.

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It returns a reverse duplicate of this array.

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Let's build and run and I will show you what I mean.

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Check it out guys it's really really cool.

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It's going to give me an error because of my simulator but all you need to do is quit the sim and rerun

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it.

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It will reopen the simulator and as soon as it's ready we will be able to see how easy it is to reverse

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all of our messages.

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By the way while this is loading I'm going to open the data service because we're going to be adding

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a function in there in just a moment but now it's ready.

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So it downloads all the messages and do you see that they're in reverse order.

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Now watch what happens when I post.

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This is the newest post.

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And you know it just for fun let's add an emoji nice thing.

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OK thing.

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And send and it shows up at the very top that is how easy it is to reverse all of our posts.

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So awesome.

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That's easy.

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Now we're going to write a function to convert our you ID into a username so to do that we're going

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to go into the data service and we're going to write a function called phunk get username for you ID.

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OK and I'm using an internal parameter there.

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And the thing is we're going to be using some firebase closures and so to get values out we need to

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use a completion handler.

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So go ahead and type handler at escaping like we have been.

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You should be an expert at this by now and in the function we're going to go ahead and pass a value

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called username of type string.

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All right.

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We're going to use that at the very end once we have our user name.

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Now we need to do is we need to observe the users reference and we need to cycle through all the users

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and find one that matches the ID we pass in.

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So to do that go ahead and call ref users observe single event.

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The reason we're doing that is because we only needed to look through at one time we don't need it to

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persistently observe.

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We're going to go ahead and observe value meaning all values in the user's reference.

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And we're going to get a snapshot back.

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And this is going to be called user snapshot.

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That's just what I'm naming it.

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Now what we're going to do is we're going to create a constant that holds this snapshot then we're going

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to write a for loop to cycle through all of them.

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So go ahead and type guard let users snapshot equals the user snapshot that we got returned snapshot

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dot children meaning all the children inside of the user snapshot.

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And we're going to return all of the objects we need to force.

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Can this just like before as a an array of WIPs data snapshot.

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Now the only thing is if we get nothing back we should do something and that is to call.

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Else wups else.

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And then inside of here we can just return and get out of this function.

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So that's what we're going to do if there is nothing return we'll just get out so that we don't have

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a crash now that we have a user snapshot assuming we get some users downloaded.

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We're going to go ahead and call for user and user snapshot and we're going to basically check to see

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if a certain user dot key because remember if we look at firebase Let's pull it up every user.

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Oh oh that's not good.

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So it looks like we've authenticated some users but the user it was deleted but it's still remaining

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inside of firebase.

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OK let's finish this function up and then we'll go fix it so that we can actually sign out and then

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sign in as a new user because right now we have no users in our Snapshot.

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If user Docky is equal to the ID we pass in k we can think about it like the feed has users and the

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users have a unique ID.

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If the the key here matches the user id we pass in then we can call handler dot or wups handler and

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we're going to pass it a string.

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But in order to get that we can go into the user account and we can call child snapshot for path.

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If you remember when we create a user Let's go to log in Visi we pass in the where is it we pass in

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an e-mail.

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You know what it might be and register user Let's see.

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Yes.

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Yes.

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We pass in a child called e-mail and so let's go ahead and let's go for the child called e-mail.

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Now of course we want the value not the key and we want to cast it as a string because we need to pass

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back a string to our handler.

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Now when we pass a I.D. it'll cycle through here.

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It will find the user that matches that you I.D. and then we will get the e-mail back for them.

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So in order to actually utilize this we need to go to the feed.

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And what we're going to do is we're actually going to use the sender ID but we're going to pass it into

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our get username function first.

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So let's go ahead and call data service instance get username for you I.D..

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We have that right here.

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Right message dot sender ID so let's pass that in to our function and the handlers where we get our

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username back.

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So let's call returned username and we can call configure cell in here now.

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So we're going to configure the cell with the proper username as returned username.

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OK.

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And that will give us our e-mail value to show up in our cell.

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Super duper cool but we're going to run into an issue.

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Let's build and run the app and we'll see that we'll get nothing back for the username.

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We may even have a crash because we currently have no users in our account.

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We're just going to get our default message back.

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We have the right number but we can't configure the cell because we're not actually getting a value

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back and that is a problem.

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So we need to actually go ahead and set up MVH see to sign us out properly.

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So let's go ahead and let's do that now by going to the story board and we're going to open up the assistant

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editor as soon as it's done loading.

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There we go.

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And let's go ahead and let's pull open MVH see which is right here and we're going to update our action

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to actually contain the proper sign out code and what we're going to do is we're going to set up what's

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called a UI alert controller.

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But we're going to modify it for log out.

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It's very cool.

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So let's go ahead and let's create an instance of you Isler controller let's call it let maybe log out

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pop up and it's going to be equal to UI alerts controller.

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Now of course this is going to have a title and a message.

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The title is just going to be log out.

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The question mark the message will be are you sure you want to log out and the preferred style.

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This is where we're going to get the log out style pop up as we're going to call action sheet.

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OK.

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That's going to pop up from the bottom similar to like when you share stuff if you wanted to share something

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and it pops up that list of options of where you can share it.

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That's an action sheet.

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Next we're going to have to create a log out action for when we tap on the button.

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What's it going to do.

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So let's do that now by typing.

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Let pop or let's do let log out.

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Log out.

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Action equal UI alert.

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Action.

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And it kind of has a similar similar style here.

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We're going to give it a title of log out a style of destructive and that means if you look it says

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well it doesn't tell you here but it basically means that it's used for things that are destructive

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like we're destroying the user's account where we're removing it completely from our app.

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So what's going to happen is when the button is tapped we're going to try to sign out and we can use

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some fire based stuff for that.

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I'm actually going to pull open MVH see in full screen here so you can see it really good.

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There we go.

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And so inside of this completion handler after the button is tapped we're going to go ahead and we're

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going to call off ah with whoops we have not imported firebase import firebase.

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There we go.

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And we're going to call off Auth..

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Sign out.

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And did you see right there it says sign out and says that it throws.

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That means it throws errors.

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And because of that we need to use do try ok.

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That's a safe way for us to call things that could have critical errors.

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So to do this we're going to do.

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And then at the end we're going to call catch and that's where errors are handled.

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So cut this and move it into the do block and now we need to call try because that tells us that we're

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going to try to sign out and assuming that works we should instantiate our log in Visi once we log out

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it should pop up the log and visi again so that we can see it.

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So go ahead and type let log in VC equal storyboard instantiate view controller with identifier and

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we're going to call our identifier which is off the seat.

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OK.

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Now in order for this to actually show up as an author Visi we need to cast it as author Visi just like

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that.

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And now we can actually present it on top of whatever view controller we're on which happens to be MVH

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seat.

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So go ahead and type self up present and we're going to present log and visi just like that animated

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of course and we don't care about what happens at the end because it doesn't really matter.

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We've signed out and that's great.

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OK.

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Since the storyboard here is optional we need to force on RRAP log in VC but it's cool.

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Oh you know what I just realized it's obviously not log in B C we should use the right name.

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Sorry about that.

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So change this to Auth. Visi and there we go.

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Now we are successfully presenting a view controller but if we can't then we're just going to print

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the error and you're probably wondering where did the error come from.

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It comes from Sign out.

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But since we're using a do catch block it automatically captures in a variable called error and sign

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out passes any values to this so if there's a problem we'll know next what we need to do now that our

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action is done is we need to add the action to our log out pop up.

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So we need to go ahead and blow this.

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Now that our log out action is finished call log out pop up add action and give it the log out action.

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OK that's simple.

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Now when the pop up goes up it knows what it can do and we push the log out button.

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And finally when we push the sign out button we need to present this whole alert.

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So now we can call present and we're going to call log out pop up.

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That's the alert controller.

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Of course we want it to be animated.

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But we do not care whether it completes or not because we handle that in here with our DO catch block.

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Let's go ahead and let's try this let's try to remove our account and then we're going to go ahead and

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move on to where we were before OK here we go and we get billed failed.

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Interesting Let's see what the problem is.

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Oh implicit use of self enclosure.

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We need to use self to access the storyboard.

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That makes sense.

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Can you go ahead and build and run and let's pull open the simulator here so we can see how that works

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when we log out.

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If successful the log out or the authentication VC should pop up automatically which would be awesome.

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So let's go give it a shot.

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Let's try to log out.

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There's our pop up and there's our message.

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Let's go ahead and tap log out and our log in Visi shows up.

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That's amazing.

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OK perfect.

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Let's log back and I'm going to actually create a new account here.

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How about Harvey Dent.

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Hey password of course is Batman.

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Let's sign in.

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All right there we go.

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Oh and you know what.

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Look at that.

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We get stuck on our off the sea we need to go fix that.

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And I know exactly how to do it.

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Of AVC when the view appears we should set it to if we are logged in we should set the view to dismiss.

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So let's go ahead and call you did appear because that's called every time the view appears not just

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when it loads for the first time.

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Call superdog viewed it appear and pass in a boolean of animated so that it's nice and animated.

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And now we need to do is we need to check using firebase first import firebase and we're going to basically

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check if off off.

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Current User is not nil wups is not nil meaning if there's a user go ahead and dismiss the view controller

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because think about it if you're logged out and this pops up there's no user once you're logged in it

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should automatically dismiss.

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OK.

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So let's go try that again.

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We're going to build and run pop this thing up and we'll go see if it worked.

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OK.

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So we're going to log out log out.

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It pops up.

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Let's log into my account here Harvey at dent dot com.

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That man is my password and let's sign in and let's see if it disappears.

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Oh you know I guess I got my password wrong.

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Bat Man.

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There we go.

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Seinen.

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And it dismisses the way we would hope.

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That's beautiful.

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OK.

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Awesome.

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We're still having the issue of our fields here not showing up and let's go figure out why that is.

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OK.

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Let's see.

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We have a user he has an e-mail and the provider is firebase.

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So let's go look at Pheed VC and let's figure out what the problem is.

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Now get user name passes in the sender ID and we get a user name return.

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But if you think about it all of these messages were not sent by a user in our database.

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So we actually should get rid of all these messages because they're never going to show up.

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From a user.

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Now what we should do and you see they disappear which is cool because it's real time.

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Let's go ahead and let's add a user or out a message from Harvey Dent.

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Hey Batman.

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You stink.

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I heard Robin laid an egg.

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Lol ok.

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Let's send it.

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And it shows up as Harvey Dent dotcom.

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That's exactly what it's supposed to do it's supposed to get all the usernames and it's supposed to

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post them at the top there of the cell.

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So so cool.

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That's working.

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I did notice something while we were doing this and this is just part of building apps you notice things

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here and there.

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When we pull open post post a new or create post-PC user at breakpoint is still showing up.

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Not the current users not the current users name.

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Let's fix that.

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All we need to do is to go into create post-PC and we need to create an IP outlet for the users e-mail

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label and we've already done it and it's already set up it's ready to go.

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But we have just not yet set it up to pass in the e-mail for the user.

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OK.

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So what we're going to do to do that is basically to call view will appear because that's going to get

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called before the view loads and it'll update the view changes so that it doesn't show the wrong email

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first and then quickly flash to change to show the right one.

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It'll just show the right one from the get go.

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So-called super You will appear animated.

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And what we're going to do since we're already logged in we can just pull out the information from firebase

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and just get the email straight from the current user.

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So call self e-mail label dot text and set it to off off off.

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Current User and it has an email property we can just pull out the user's e-mail address straight from

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firebase.

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So go ahead and build and run.

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And let's go see if this change is reflected appropriately.

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And the reason I'm doing this is because you can't even get to this screen unless you're logged in.

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So go ahead and open it and look at that Harvey at dent dot com.

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There's one other place we should do this.

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It's here in visi.

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So I'm actually going to just copy this and go to TVC and I'm going to paste it because we said the

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same name for the e-mail label.

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Let's build and run again and let's make sure that it works OK.

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OK let's check it out.

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All right.

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Very good.

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But what happens if we log out let's try logging out and log into a new account.

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Let me log into my old account.

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Well I mean log into a new one here maybe Batman at Gotham dot net and the password Joker sucks.

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Seinen.

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And here's the problem it's still holding the old user's name.

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Now a way that we can fix this is if we put it in view will appear because every time the view appears

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it's going to change the current user.

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So let's call you appear super dog.

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You will appear animated.

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And we will update this as soon as the view appears that way.

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We don't have that same issue.

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So go ahead and build and run it let it happen and as soon as it goes up we will check to see if it

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worked.

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Here we go.

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OK.

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So Batman at Gotham dot net.

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It's actually make a post.

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Hey there it is up at the top.

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Very nice.

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Now when we log out and log back in let's log in is Harvey Dent dotcom.

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What was my password.

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Batman I think.

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Let's sign in and it should update the user and show the new user name as soon as the view appears very

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very awesome.

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So let's go ahead let's move on to the next video we did just a couple of little tweaks here just for

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fun.

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In the middle of it.

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But now our feed cells are showing usernames our message array is reversed so the most current post

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is on top.

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And guys this is looking really good so far in the next video we're going to create one of my favorite

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controllers in this whole app it's called create group Visi and it's going to allow us to search through

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all the users that have created accounts in our apps and add them specifically it's going to be really

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really cool.

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So let's move on to the next video and let's start adding some groups into our app.