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Everyone.



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Welcome back Johnny be here with Dev's Lokes dot com.



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And in this lesson we are going to refine our log in logic as well as some other stuff having to do



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with selecting a channel and this lesson is kind of mostly getting ready to work with messages.



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So it might be a little bit all over the place but I'll try to make it as clear as possible.



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We just got a lot of little little things that we need to fix up before we're ready to continue getting



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messages.



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All right.



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So we're going to start out here in the channel Visi And here in the ad channel preste first thing that



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we're going to do is we're going to do a check to say that we can only add a channel if we're already



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logged into Want to see if off service for instance is logged in then we are able to show that modals



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we're going to cut that and paste that right in here.



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And then another thing that I noticed was that when we are logged in and then we log out the channels



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they stay there.



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All right.



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So we need those channels to disappear after we log out.



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So we're going covert come over to our message service starts with the file and we're going to create



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a function to do that so I'm going to quickly just for a quick clean up is this function a little bit.



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And folks could say phunk clear Channel's



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And that's just channels dot every move.



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All right.



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So that's just clearing out our array of channels that we have here.



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And while we're in here.



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Another variable that we're going to need later is we're going to have a variable for the selected channel



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so whichever channel that we have currently selected We're going to store that here from the say selected



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channel and but that's going to be an optional because if we're not logged in then obviously we don't



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have a selected channel so we're going to see a channel and a question mark for optional right.



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It's going to save that and let's test let's test this.



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But first we have to put it in the we have to call it somewhere.



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So when they use the data service when we log out we are also going to call message service dot instance



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dot clear channels.



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So I'm going to say that.



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And then the last thing that we need to do is in our policy here in our set up user info which is called



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whenever the user data changes we are going to say right here in the else table view not reload data.



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All right so the flow is we press log out and that triggers a user data did change notification right



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here.



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And so when we click log out we have set the is logged in bold to false.



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So this portion of the function will be called and we will at that point the channels array will be



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empty.



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So when we reload the table view then itll reload with all empty.



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All right.



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So it was go ahead and run this just to test it to run it on iPhone 6 s and say run.



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All right he's going to come over here and we have all of our channels here and I'm going to log out



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and boom they are gone.



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All right.



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So let's continue on the next thing that we're going to do is kind of refine our log and process.



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So when we first launch and this is called if we're logged in then we then we do the find use by email



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and post a use of day to day change.



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So right now we're calling our final channel right here.



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But that's not where we actually wanted.



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So we're going to we're going to create a function for for the user data to change.



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But first we need to have an observer for it right.



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So we're going to say notification center dot defunct dot ad observer and you see this guy right here



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the observer is sulf the selector is that we haven't created it yet but I can actually just copy the



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one from Channel Visi just to save us some time right here just a day to change it and when to come



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back here and paste that right here.



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All right so the selector is hash tag.



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So look for then



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chapt the dot user data to change.



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And then we don't have this functions.



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That's fine.



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And the name of the notification is no to underscore user did to change the object is new.



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OK so going through the flow again we launched the app from a fresh start.



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But we had previously logged in.



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So we use our find used by email function to get our information for our user.



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Then we post the note refuse to do the change will be detected here in Chad Visi by this observer as



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well as in the Channel see by its observer.



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And then here in the.



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So then we need to decide what we want to have happen in the chat we see when a user's data changes.



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OK so we're going to do a check we're going to say if off service that instance that is logged in then



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we are going to say this is where we're going to get our good channels which we'll figure out in just



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a second.



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Else if no one is logged in then we're going to change our channel label to say Please log in.



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And I don't think we actually have an idea for that yet.



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Missy hold down option and click on Moondust storyboard



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and come down here and grab this outlet right in the sky right here and go control drag and drop you



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right here and we're going to call this channel name label connect and go back.



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And so here we're going to say channel name label dot text is equal to please log in.



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OK.



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So after we log out if we went back to the main chat the C at the top it'll say Please log in.



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All right so now let's get the channels here.



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Actually I think we're going to put this inside another function down here.



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So we're going to funk on log in get messages.



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So right when we log in this function is going to be called and we're gonna say Message Service that



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instance dot get or find out find all channel completion success.



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And right now we're not doing anything after the channels are gotten but just in preparation We'll see



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if success and then I'll say do stuff with channels.



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All right.



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So save that and then call that right here.



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So this is on log get messages



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get on let's just clean this up.



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But that I so let's go ahead and see if what we've done so far is working out.



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We haven't done a whole lot just kind of lay down some boilerplate code.



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And I think the one thing that will show is we should be able to still see our channels when we when



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we log in and say we at the top come one two three four five six.



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So you'll notice that when we logged in from here without having already been logged in the the channels



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aren't showing up.



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And the reason for that is that the channel view doesn't it doesn't know that the channels have been



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loaded and so it doesn't know to reload the data.



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So what we're going to do is we're going to create a notification that will be called from message service



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that swift that will let the channel controller know hey I just pulled down all these channels so go



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ahead and up load or reload your table and displayed them all right.



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So that's going to be right here in place of this print statement.



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We're going to need to create and unification so I'm going to open up Constans where you are here.



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OK.



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And I'm just going to copy this notification name pasted and we're going to say channels who did and



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then changed the name to channels loaded.



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All right so now we created the notification name.



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Now let's go ahead and create the post and the observers for it.



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So the Post is going to be in message service just lived here during the same notification center.



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That default post we want this one right here.



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The name is no to underscore channels loaded the object is no.



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OK so after all of the channels have been retrieved from the API we're going to shut off this notification



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that that that's ready to go.



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All right.



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And then in channel Visi I see down here we need to add an observer.



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So I'm going to say notification Well let's create our selective function first.



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I think that's the better way to go about this.



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All right.



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So we got at Objective-C funk and call this channel's loaded and the same as this guy right up here



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to underscore a note of then notification.



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And what we're going to do here is we're just going to reload our tape abuse data Serenity tape of you



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reload data.



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Right now let's create our observer and say notification center default and Observer the observer is



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self the selector is hash tag selector and then channel the see that channels loaded.



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That's our function and the name is known to underscore channels loaded.



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The object is now going to say that and clean up a little bit spacing.



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And just to go over the flow one more time and Mrs. Server start Swift after the channels are retrieved



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we shoot this notification channel Visi observes that notification and calls this channel right here



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channel is loaded which simply reloads the table view data rights from the Save that and run it up ready



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so we need to test it from a fresh logons when to log out and then log in and spookiness have a dot



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com.



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One two three four five six log in.



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And then we get.



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So now the channels are showing up from our very own logon.



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All right so that looks looks good already the next thing that I want to do is actually have this chat



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view update some of its information based on which channel we select.



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All right.



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So let's go ahead and do that.



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We're going to use the notification for that as well so jump on to Constans and we're going to create



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a new notification name and just copy that and say you know to underscore channel selected came over



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here to this channel so like I did I'm going to save that.



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And we're we're going to be doing our work here is mostly in well I guess in both Channel B C and Chad.



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DC First off in channel ABC we're going to create the function or we're going to utilize the built in



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table view method for selecting and table view items.



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We're going to say did select and that will pull up our function that we need to select row at.



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OK.



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So what are we doing when we select a row.



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We are going to save the selected channel into our message service variable selected channel and then



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we're going to notify the chapt VC that we have selected a channel and then we want to dismiss or to



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close the menu have the chad slide back over.



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Right.



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So pretty simple we're going to say left channel equal when I say message serviced instance DOD channels



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and we're gonna grab the channel that corresponds to the one that we select.



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So index path that Arrau.



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OK so now we have our selected channel and we're going to set that equal to the message service that



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instance does select that channel is equal to that channel.



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And then we're going to say Notification Center we're going to shut off our notification that the channel



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has been selected that we just created.



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So in a default top post and this is the one we want we're going to post the notification with the name



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notice of channel selected object is new.



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All right so again we create the channel based on which one we select set that equal to the selected



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channel and should offer notification that we have indeed selected a channel.



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All right.



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And now what we're going to do is make the menu slide back in place.



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And that's also pretty easy.



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All we got to do is say self reveal View Controller and then say that reveal toggle.



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And we want this one here animated with a bowl and say reveal toggle of animated true.



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So we're just saying we're just accessing our review of your controller and we're calling misfunction



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revealed toggle which is what we use to slide back and forth the menu.



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All right.



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Sue that looks good save for that.



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And let's let's test that.



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Just that so far.



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All right so all we're doing here is we're just testing that when we select a.



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Yeah there we go that when we select an item the menu closes.



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All right so this cool stuff.



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Then jump in a chat B.c.



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So now we are shooting out a notification that we have selected a channel so we need to add an observer



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for it so that we can listen for that notification saying notification center default dot and Observer



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and the observer is olf the selector.



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Let's go ahead and create that.



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So here we're going to say at Objective-C and we say phunk channel selected and underscore and notice.



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And that's of type notification.



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There you go.



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And then we're going to do something we'll work with that in just a second but our selector are going



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to say so look after his chat and we see the opt channel selected the name of the notification that



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we are listening for is a note with Channel selected and the object is nil.



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All right so there we're going to save that.



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And what do we want to have happen when we select the channel.



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What we're going to call a function called update with channel.



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And the reason we have some of these you may be wondering like why don't we just put whatever we're



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going to put right here here.



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The reason for that is that we're going to be calling some of these functions in multiple places.



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So I'm just pre optimizing for that.



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All right.



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OK so here I'm going to say update with channel.



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And what are we going to do here in the update with Channel.



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Well right now we don't have a whole tend to do all that I really want to do is make it so that when



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we do that when we select a channel that we update this right here this label to be the name of the



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channel.



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So we're going to do is we're going to say let channel name.



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We have to unwrap our channel name from the message service that instant starts to look at channels



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for say Message Service instance that selected channel



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dot channel title and then we're going to use our coalescing nil.



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So if it can't find a non optional stream then just set it equal to an empty string and then going to



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say channel name label.



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That text is people who are going to do our hash tag and then string inter-relate channel name all right



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to save that and let's run that and see if that works.



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All right.



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So let's check this out.



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Going to click on general dismisses And hey there we go.



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Update our channel label right here.



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So right now and now we're really starting to look like a chat app.



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So good.



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And a new channel and I call this water cooler create the channel boom it sets up we can add that.



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All right.



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We're looking really good.



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All right so now this was kind of just a whole lot of logic in setting up some functions that were going



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to be using here in the next several lessons.



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But still some still some pretty cool stuff.



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We're updating we're using notifications to let different controllers know what's going on and stuff.



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So some pretty fun stuff and I'm just going to finish up by adding and committing our changes and then



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I'll see you guys all in the next one.