1

00:00:08,040 --> 00:00:12,540

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



2

00:00:12,540 --> 00:00:17,920

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



3

00:00:17,970 --> 00:00:22,230

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



4

00:00:22,230 --> 00:00:23,070

supposed to.



5

00:00:23,280 --> 00:00:29,160

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



6

00:00:29,160 --> 00:00:35,310

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



7

00:00:35,310 --> 00:00:38,520

you what I mean in the feed.



8

00:00:38,520 --> 00:00:43,020

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



9

00:00:43,020 --> 00:00:43,400

top.



10

00:00:43,410 --> 00:00:44,280

And it's really easy.



11

00:00:44,280 --> 00:00:48,860

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



12

00:00:48,870 --> 00:00:54,770

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



13

00:00:54,770 --> 00:01:01,380

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



14

00:01:01,610 --> 00:01:05,320

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



15

00:01:05,330 --> 00:01:10,010

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



16

00:01:10,340 --> 00:01:11,890

to reverse the order of the array.



17

00:01:11,900 --> 00:01:19,380

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



18

00:01:19,500 --> 00:01:20,560

That's it.



19

00:01:20,580 --> 00:01:23,370

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



20

00:01:23,430 --> 00:01:26,890

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



21

00:01:26,910 --> 00:01:28,890

I'm not kidding you it is that easy.



22

00:01:28,920 --> 00:01:31,880

It returns a reverse duplicate of this array.



23

00:01:31,950 --> 00:01:34,870

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



24

00:01:35,070 --> 00:01:36,990

Check it out guys it's really really cool.



25

00:01:37,020 --> 00:01:39,230

It's going to give me an error because of my simulator.



26

00:01:39,240 --> 00:01:43,740

But all you need to do is quit the sim and rerun it.



27

00:01:43,800 --> 00:01:51,480

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



28

00:01:51,540 --> 00:01:53,190

all of our messages.



29

00:01:53,400 --> 00:01:56,910

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



30

00:01:56,910 --> 00:02:00,390

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



31

00:02:00,390 --> 00:02:03,310

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



32

00:02:03,310 --> 00:02:05,390

Now watch what happens when I post.



33

00:02:05,580 --> 00:02:09,330

This is the newest post.



34

00:02:09,330 --> 00:02:13,090

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



35

00:02:13,360 --> 00:02:14,920

Nice thing.



36

00:02:14,930 --> 00:02:23,100

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



37

00:02:23,100 --> 00:02:23,890

So awesome.



38

00:02:23,910 --> 00:02:24,960

That's easy.



39

00:02:24,960 --> 00:02:31,170

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



40

00:02:31,170 --> 00:02:38,360

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



41

00:02:39,490 --> 00:02:41,750

OK and I'm using an internal parameter there.



42

00:02:42,090 --> 00:02:48,840

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



43

00:02:48,840 --> 00:02:50,910

to use a completion handler.



44

00:02:50,910 --> 00:02:54,990

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



45

00:02:55,200 --> 00:02:57,190

You should be an expert at this by now.



46

00:02:57,360 --> 00:03:03,870

And in the function we're going to go ahead and pass a value called username of type string.



47

00:03:03,870 --> 00:03:04,920

All right.



48

00:03:04,920 --> 00:03:08,120

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



49

00:03:08,160 --> 00:03:13,500

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



50

00:03:13,530 --> 00:03:17,010

and find one that matches the ID we pass in.



51

00:03:17,280 --> 00:03:23,250

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



52

00:03:23,250 --> 00:03:26,370

The reason we're doing that is because we only need to look through at one time.



53

00:03:26,370 --> 00:03:28,470

We don't need it to persistently observe.



54

00:03:28,710 --> 00:03:33,120

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



55

00:03:33,120 --> 00:03:35,270

And we're going to get a snapshot back.



56

00:03:35,310 --> 00:03:37,680

And this is going to be called user snapshot.



57

00:03:37,680 --> 00:03:39,510

That's just what I'm naming it.



58

00:03:39,510 --> 00:03:45,090

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



59

00:03:45,090 --> 00:03:47,760

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



60

00:03:47,790 --> 00:03:55,790

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



61

00:03:56,250 --> 00:04:00,070

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



62

00:04:00,090 --> 00:04:06,450

And we're going to return all of the objects we need to force cast this just like before as a an array



63

00:04:06,450 --> 00:04:09,230

of WIPs data snapshot.



64

00:04:09,570 --> 00:04:12,780

Now the only thing is if we get nothing back we should do something.



65

00:04:12,840 --> 00:04:14,010

And that is to call.



66

00:04:14,010 --> 00:04:17,600

Else what else.



67

00:04:17,700 --> 00:04:22,860

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



68

00:04:23,130 --> 00:04:26,370

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



69

00:04:26,370 --> 00:04:32,580

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



70

00:04:32,580 --> 00:04:40,320

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



71

00:04:40,710 --> 00:04:48,870

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



72

00:04:49,130 --> 00:04:50,490

Oh.



73

00:04:51,080 --> 00:04:52,530

Oh that's not good.



74

00:04:52,530 --> 00:04:59,990

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



75

00:05:00,030 --> 00:05:01,400

of firebase.



76

00:05:01,410 --> 00:05:05,190

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



77

00:05:05,190 --> 00:05:09,210

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



78

00:05:09,510 --> 00:05:16,190

If user Dom key is equal to the ID we pass in K..



79

00:05:16,740 --> 00:05:21,640

We can think about it like the feed has users and the users have a unique ID.



80

00:05:21,990 --> 00:05:31,140

If the the key here matches the ID we pass in then we can call handler dot or wups handler and we're



81

00:05:31,140 --> 00:05:33,090

going to pass a string.



82

00:05:33,090 --> 00:05:39,390

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



83

00:05:39,390 --> 00:05:50,550

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



84

00:05:50,640 --> 00:05:52,480

an e-mail.



85

00:05:52,620 --> 00:05:54,650

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



86

00:05:54,660 --> 00:05:55,320

Yes.



87

00:05:55,320 --> 00:05:55,520

Yes.



88

00:05:55,530 --> 00:06:03,720

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



89

00:06:03,720 --> 00:06:06,450

Now of course we want the value not the key.



90

00:06:06,630 --> 00:06:11,430

And we want to cast it as a string because we need to pass back a string to our handler.



91

00:06:11,490 --> 00:06:14,980

Now when we pass any you I.D. it will cycle through here.



92

00:06:15,060 --> 00:06:21,690

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



93

00:06:21,690 --> 00:06:25,420

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



94

00:06:25,890 --> 00:06:31,680

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



95

00:06:31,680 --> 00:06:33,630

our get username function first.



96

00:06:33,630 --> 00:06:40,320

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



97

00:06:40,620 --> 00:06:42,240

We have that right here.



98

00:06:42,360 --> 00:06:42,630

Right.



99

00:06:42,630 --> 00:06:48,750

Message that Sender ID so let's pass that in to our function and the handlers where we get our user



100

00:06:48,750 --> 00:06:49,410

name back.



101

00:06:49,410 --> 00:06:56,960

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



102

00:06:57,030 --> 00:07:02,460

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



103

00:07:02,520 --> 00:07:02,940

OK.



104

00:07:03,030 --> 00:07:06,250

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



105

00:07:06,260 --> 00:07:09,380

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



106

00:07:09,390 --> 00:07:13,930

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



107

00:07:13,920 --> 00:07:17,610

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



108

00:07:18,350 --> 00:07:20,840

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



109

00:07:20,840 --> 00:07:26,840

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



110

00:07:26,840 --> 00:07:28,820

back and that is a problem.



111

00:07:28,820 --> 00:07:33,990

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



112

00:07:34,010 --> 00:07:40,370

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



113

00:07:40,370 --> 00:07:42,870

editor as soon as it's done loading.



114

00:07:42,890 --> 00:07:43,580

There we go.



115

00:07:44,980 --> 00:07:53,410

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



116

00:07:53,410 --> 00:07:58,690

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



117

00:07:58,690 --> 00:08:00,940

called a UI alert controller.



118

00:08:01,060 --> 00:08:02,710

But we're going to modify it for logout.



119

00:08:02,710 --> 00:08:03,520

It's very cool.



120

00:08:03,520 --> 00:08:12,100

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



121

00:08:12,130 --> 00:08:17,190

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



122

00:08:17,200 --> 00:08:21,070

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



123

00:08:21,070 --> 00:08:24,770

The title is just going to be log out of the question mark.



124

00:08:24,880 --> 00:08:26,090

The message will be.



125

00:08:26,140 --> 00:08:33,040

Are you sure you want to log out and the preferred style.



126

00:08:33,040 --> 00:08:38,240

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



127

00:08:38,560 --> 00:08:39,040

OK.



128

00:08:39,190 --> 00:08:42,190

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



129

00:08:42,310 --> 00:08:46,720

If you wanted to share something and it pops up that list of options of where you can share it that's



130

00:08:46,720 --> 00:08:48,120

an action sheet.



131

00:08:48,130 --> 00:08:51,910

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



132

00:08:51,910 --> 00:08:52,930

What's it going to do.



133

00:08:53,170 --> 00:08:54,700

So let's do that now by typing.



134

00:08:54,700 --> 00:09:06,670

Let pop or let's do let log out log out action equal UI alert action and it kind of has a similar similar



135

00:09:06,670 --> 00:09:07,780

style here.



136

00:09:07,780 --> 00:09:15,100

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



137

00:09:15,580 --> 00:09:20,590

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



138

00:09:20,590 --> 00:09:25,510

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



139

00:09:25,510 --> 00:09:33,370

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



140

00:09:33,430 --> 00:09:35,550

some firebase stuff for that.



141

00:09:35,590 --> 00:09:39,820

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



142

00:09:39,820 --> 00:09:40,870

There we go.



143

00:09:40,900 --> 00:09:45,670

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



144

00:09:45,670 --> 00:09:53,160

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



145

00:09:53,170 --> 00:09:54,100

There we go.



146

00:09:54,370 --> 00:09:56,830

And we're going to call off Auth..



147

00:09:57,130 --> 00:09:58,370

Sign out.



148

00:09:58,530 --> 00:10:02,140

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



149

00:10:02,140 --> 00:10:04,000

That means it throws errors.



150

00:10:04,000 --> 00:10:07,100

And because of that we need to use do try.



151

00:10:07,230 --> 00:10:07,620

OK.



152

00:10:07,660 --> 00:10:11,810

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



153

00:10:11,830 --> 00:10:14,060

So to do this we're going to do.



154

00:10:14,470 --> 00:10:18,470

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



155

00:10:18,520 --> 00:10:25,150

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



156

00:10:25,150 --> 00:10:31,450

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



157

00:10:31,450 --> 00:10:34,560

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



158

00:10:34,570 --> 00:10:44,980

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



159

00:10:44,980 --> 00:10:48,550

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



160

00:10:48,810 --> 00:10:49,150

OK.



161

00:10:49,150 --> 00:10:57,940

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



162

00:10:58,270 --> 00:11:03,110

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



163

00:11:03,110 --> 00:11:03,720

seat.



164

00:11:03,730 --> 00:11:11,860

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



165

00:11:11,860 --> 00:11:17,290

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



166

00:11:17,290 --> 00:11:19,390

We've signed out and that's great.



167

00:11:19,750 --> 00:11:20,430

OK.



168

00:11:20,440 --> 00:11:26,010

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



169

00:11:26,290 --> 00:11:28,050

Oh you know what I just realized it's off.



170

00:11:28,130 --> 00:11:30,580

VC not log in B C we should use the right name.



171

00:11:30,580 --> 00:11:31,920

Sorry about that.



172

00:11:31,930 --> 00:11:36,130

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



173

00:11:36,130 --> 00:11:41,680

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



174

00:11:42,220 --> 00:11:45,610

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



175

00:11:45,610 --> 00:11:47,520

It comes from Sign out.



176

00:11:47,530 --> 00:11:54,040

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



177

00:11:54,040 --> 00:11:56,090

out passes any values to this.



178

00:11:56,110 --> 00:12:02,290

If there's a problem we'll know next what we need to do now that our action is done is we need to add



179

00:12:02,290 --> 00:12:04,500

the action to our log out pop up.



180

00:12:04,540 --> 00:12:06,460

So we need to go ahead and blow this.



181

00:12:06,460 --> 00:12:13,740

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



182

00:12:13,910 --> 00:12:15,450

OK that's simple.



183

00:12:15,450 --> 00:12:20,110

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



184

00:12:20,110 --> 00:12:24,340

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



185

00:12:24,340 --> 00:12:28,950

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



186

00:12:29,020 --> 00:12:30,750

That's the alert controller.



187

00:12:30,790 --> 00:12:32,470

Of course we want it to be animated.



188

00:12:32,490 --> 00:12:37,770

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



189

00:12:37,780 --> 00:12:38,970

Do catch block.



190

00:12:39,130 --> 00:12:44,350

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



191

00:12:44,960 --> 00:12:51,340

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



192

00:12:51,350 --> 00:12:53,270

Interesting Let's see what the problem is.



193

00:12:53,290 --> 00:12:55,140

Oh implicit use of self enclosure.



194

00:12:55,160 --> 00:12:58,950

We need to use self to access the storyboard that makes sense.



195

00:12:58,960 --> 00:13:04,760

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



196

00:13:04,760 --> 00:13:06,320

when we log out.



197

00:13:06,530 --> 00:13:12,470

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



198

00:13:12,470 --> 00:13:14,150

So let's go give it a shot.



199

00:13:14,180 --> 00:13:16,260

Let's try to log out.



200

00:13:16,260 --> 00:13:21,800

There's our pop up and there's our message let's go ahead and tap log out and our log in Visi shows



201

00:13:21,800 --> 00:13:21,920

up.



202

00:13:21,920 --> 00:13:22,620

That's amazing.



203

00:13:22,640 --> 00:13:23,690

OK perfect.



204

00:13:23,690 --> 00:13:26,530

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



205

00:13:26,560 --> 00:13:29,600

How about Harvey at dent dot com.



206

00:13:29,730 --> 00:13:32,950

Hey password of course is Batman.



207

00:13:32,990 --> 00:13:36,450

Let's sign in.



208

00:13:36,540 --> 00:13:37,910

All right there we go.



209

00:13:38,370 --> 00:13:39,030

Oh and you know what.



210

00:13:39,030 --> 00:13:39,500

Look at that.



211

00:13:39,500 --> 00:13:43,400

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



212

00:13:43,410 --> 00:13:45,940

And I know exactly how to do it.



213

00:13:46,060 --> 00:13:53,760

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



214

00:13:53,760 --> 00:13:54,770

So let's go ahead and call.



215

00:13:54,810 --> 00:13:59,070

You did appear cause that's called every time the view appears not just when it loads for the first



216

00:13:59,070 --> 00:13:59,840

time.



217

00:14:00,030 --> 00:14:07,350

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



218

00:14:07,350 --> 00:14:15,480

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



219

00:14:15,480 --> 00:14:18,150

check if off off.



220

00:14:18,210 --> 00:14:28,740

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



221

00:14:30,210 --> 00:14:34,830

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



222

00:14:34,830 --> 00:14:36,830

should automatically dismiss.



223

00:14:36,830 --> 00:14:37,190

OK.



224

00:14:37,290 --> 00:14:38,510

So let's go try that again.



225

00:14:38,520 --> 00:14:42,000

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



226

00:14:44,460 --> 00:14:44,790

OK.



227

00:14:44,900 --> 00:14:47,350

So we're going to log out log out.



228

00:14:47,390 --> 00:14:48,320

It pops up.



229

00:14:48,470 --> 00:14:53,270

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



230

00:14:53,390 --> 00:14:55,090

That man is my password.



231

00:14:55,190 --> 00:15:03,090

And let's sign in and let's see if it disappears Oh you know I guess I got my password wrong.



232

00:15:03,090 --> 00:15:03,890

Bat Man.



233

00:15:03,890 --> 00:15:04,530

There we go.



234

00:15:04,610 --> 00:15:05,880

Sign in.



235

00:15:06,530 --> 00:15:08,150

And it dismisses the way we would hope.



236

00:15:08,150 --> 00:15:08,960

That's beautiful.



237

00:15:08,960 --> 00:15:09,440

OK.



238

00:15:09,740 --> 00:15:10,220

Awesome.



239

00:15:10,250 --> 00:15:16,780

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



240

00:15:17,090 --> 00:15:17,510

OK.



241

00:15:17,630 --> 00:15:18,560

Let's see.



242

00:15:18,560 --> 00:15:22,400

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



243

00:15:22,400 --> 00:15:29,510

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



244

00:15:29,600 --> 00:15:34,820

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



245

00:15:34,820 --> 00:15:40,120

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



246

00:15:40,130 --> 00:15:45,320

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



247

00:15:45,410 --> 00:15:51,060

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



248

00:15:51,060 --> 00:15:55,590

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



249

00:15:55,590 --> 00:15:56,730

Hey Batman.



250

00:15:56,730 --> 00:15:58,680

You stink.



251

00:15:58,680 --> 00:16:02,230

I heard Robin laid an egg.



252

00:16:03,180 --> 00:16:03,890

Lol.



253

00:16:04,270 --> 00:16:04,730

OK.



254

00:16:04,860 --> 00:16:06,340

Let's send it.



255

00:16:06,540 --> 00:16:09,180

And it shows up as Harvey at dent dot com.



256

00:16:09,180 --> 00:16:10,860

That's exactly what it's supposed to do.



257

00:16:10,860 --> 00:16:15,910

It's supposed to get all the usernames and it's supposed to post them at the top of the cell.



258

00:16:15,930 --> 00:16:17,470

So so cool.



259

00:16:17,550 --> 00:16:18,570

That's working.



260

00:16:18,570 --> 00:16:22,650

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



261

00:16:22,650 --> 00:16:30,660

here in there when we pull open post post a new or create post-PC user at breakpoint is still showing



262

00:16:30,660 --> 00:16:30,860

up.



263

00:16:30,870 --> 00:16:34,740

Not the current users not the current users name.



264

00:16:34,740 --> 00:16:35,880

Let's fix that.



265

00:16:35,940 --> 00:16:43,620

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



266

00:16:43,620 --> 00:16:45,270

label and we've already done it.



267

00:16:45,390 --> 00:16:51,420

It's already set up it's ready to go but we have just not yet set it up to pass in the e-mail for the



268

00:16:51,420 --> 00:16:52,360

user.



269

00:16:52,950 --> 00:16:58,770

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



270

00:16:58,770 --> 00:17:04,320

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



271

00:17:04,320 --> 00:17:07,610

first and then quickly flashed a change to show the right one.



272

00:17:07,710 --> 00:17:09,150

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



273

00:17:09,150 --> 00:17:12,050

So-called super You will appear animated.



274

00:17:12,150 --> 00:17:17,670

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



275

00:17:17,700 --> 00:17:19,800

and just get the email straight from the current user.



276

00:17:19,890 --> 00:17:27,270

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



277

00:17:27,480 --> 00:17:32,880

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



278

00:17:32,880 --> 00:17:33,850

firebase.



279

00:17:33,870 --> 00:17:35,390

So go ahead and BuildOn run.



280

00:17:35,410 --> 00:17:38,390

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



281

00:17:43,230 --> 00:17:46,470

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



282

00:17:46,470 --> 00:17:50,240

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



283

00:17:50,250 --> 00:17:52,640

There's one other place we should do this.



284

00:17:52,650 --> 00:17:54,350

It's here in visi.



285

00:17:54,540 --> 00:17:59,370

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



286

00:17:59,370 --> 00:18:01,430

same name for the e-mail label.



287

00:18:01,500 --> 00:18:05,680

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



288

00:18:09,800 --> 00:18:11,000

OK let's check it out.



289

00:18:11,000 --> 00:18:11,450

All right.



290

00:18:11,480 --> 00:18:12,050

Very good.



291

00:18:12,050 --> 00:18:18,710

But what happens if we log out let's try logging out and log into a new account let me log in to my



292

00:18:18,710 --> 00:18:19,410

old account.



293

00:18:19,430 --> 00:18:29,260

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



294

00:18:30,020 --> 00:18:34,420

Seinen.



295

00:18:34,780 --> 00:18:39,440

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



296

00:18:39,670 --> 00:18:46,030

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



297

00:18:46,030 --> 00:18:47,680

it's going to change the current user.



298

00:18:47,680 --> 00:18:50,410

So let's call it you will appear super dog.



299

00:18:50,440 --> 00:18:56,430

You will appear animated and we will update this as soon as the view appears that way.



300

00:18:56,500 --> 00:18:57,690

We don't have that same issue.



301

00:18:57,700 --> 00:19:02,950

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



302

00:19:02,950 --> 00:19:04,040

worked.



303

00:19:05,070 --> 00:19:05,810

Here we go.



304

00:19:06,140 --> 00:19:06,360

OK.



305

00:19:06,360 --> 00:19:07,880

So Batman at Gotham dot net.



306

00:19:08,020 --> 00:19:09,750

Let's actually make a post.



307

00:19:10,060 --> 00:19:13,610

Hey there it is up at the top.



308

00:19:13,610 --> 00:19:14,780

Very nice.



309

00:19:14,780 --> 00:19:24,360

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



310

00:19:24,380 --> 00:19:25,930

Batman I think.



311

00:19:26,000 --> 00:19:31,370

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



312

00:19:31,490 --> 00:19:32,710

very awesome.



313

00:19:32,720 --> 00:19:37,040

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



314

00:19:37,040 --> 00:19:37,620

fun.



315

00:19:37,790 --> 00:19:38,700

In the middle of it.



316

00:19:38,780 --> 00:19:44,240

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



317

00:19:44,240 --> 00:19:45,190

is on top.



318

00:19:45,440 --> 00:19:50,690

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



319

00:19:50,870 --> 00:19:56,330

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



320

00:19:56,390 --> 00:20:01,190

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



321

00:20:01,190 --> 00:20:02,060

really cool.



322

00:20:02,060 --> 00:20:05,310

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