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Everyone welcome back.

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Joining me here with those slopes dot com.

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And in this lesson we are going to work on logging in the user.

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So up till now the only way to kind of log in is to actually create an account.

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But I'm getting tired of creating accounts every single time.

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So we're going to get this whole logging issue fixed.

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All right so what.

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What do we need to do.

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Well Mr. Postman and I want to show you what what's going on here.

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So when we log in a user see here we can log in with this account.

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So when I log in what is returned to us is a token came and a user name and we save that into the user

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defaults for the user and the off token.

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But that doesn't give us the other information we need which is the user name the avatar image the background

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color and those other things.

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So the only one the only function that we have so far that gives us that information is when we add

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a user we get back.

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This chase on object right and that contains all of the user infor information that we need.

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So we're going to need a new function and the API provides us one.

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And that's that function is called the find use or by e-mail function.

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All right and so it's this route right here.

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So user by e-mail and then at the end you append the user's e-mail and that function actually returns

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the exact same Jaison as the add user.

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OK.

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So that gives us the ID abat color avatar name email and name.

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OK.

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So this is what we're going to work on.

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First we're going to create a new function that can go and fetch that information based just on the

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users email that we get after we log in and came.

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So we get the users email in off token then we use that e-mail and auto can to get the rest of their

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information.

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All right.

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So let's get to it.

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We're going to do this in the off service Dodsworth file sibb and come down here to the bottom and create

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a new function.

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We're going to call this funk find user by email Ken.

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And this one we don't actually need to pass anything into it except for.

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We're just going to have our completion handler I say at it's keeping it and completion handler.

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All right there we go.

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So first off let's go ahead and create our your all going to open.

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Run over to utilities.

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Where are you.

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Here you go.

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Constance And our next your health is called Let your underscore user by e-mail that is going to equal

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the base you are ill and then you some quotation marks base you are l and then user slash by email slash.

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And then over in our office service we're going to append to that the users email but we'll get to that

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in a second.

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All right.

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And we don't actually need a body we don't need to do any lowercase e-mail or anything.

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We will need the better header but we have that saved as a.

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Or do we.

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Oh no we do not.

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OK.

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So we need we're going to be using this header right here.

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And so since we'll be using it in multiple locations Go ahead.

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And I'm just going to cut this header.

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This is from the create user function.

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I'm cutting that header and we're going to jump down here to our hitter's section and I'm going to call

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this better.

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Header.

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OK because this is the header that contains the authorization token going to copy that and then go back

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to our service that swift.

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And here we're going to replace Heather here with barer header.

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OK.

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All right.

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So now we're back in the Find use or by e-mail we've created a constant for the bearer authorization

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token header and now we're going to create our find user by e-mail.

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Alamo of our request OK so the Alamo fire dot request and I'm going to use the same one we've been using

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this time although we're going to have to do a little bit of string interpolation.

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We're going to start with the your L by user or user or by email and then we are going to add onto that

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the user e-mail OK remember this function has been called directly after we call the log in a function

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right here which saves to our user defaults the user e-mail and the token.

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So that's why we have access to those in this function and the type is what is the type.

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It might be a.

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Actually yes so this function is actually a get.

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So this will be our one of our first methods here.

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So to do that we just say dupped get the parameters are at.

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No we don't have a body to pass this time.

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The encoding is Loeb's encoding is based on in coding that default and the headers is our constant Herter

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that we just created and the response is a response.

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Her response to Jaison.

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I'm going to press going to close the side pains to give this little bit more room and clicking here

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pressing enter and renaming the data response to just response and then getting rid of that placeholder

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for code.

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Okeydokey So now we are doing essentially exactly the same thing as we did in the create user function

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now.

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OK.

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So I could actually just copy this entire section here from the create user because the response and

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the sun is exactly the same like we saw in Postman.

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So here is the response for the add user.

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And here it is for the find user by email.

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OK.

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But we don't not want to violate the dry principle.

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Right.

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So what we need to do is we're going to go ahead and just extract out all of this right here.

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OK.

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So I'm going to cut this.

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We're going to create a new function called phunk set user info and into that we are going to pass data

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type data and then I'm going to paste what we just cut and then right up here where we cut it from I'm

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going to call that function that we just created.

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I mean to say self set the user info data and we're going to pass into it this data right here that

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we're getting from the response.

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All right.

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So basically all we're doing is if the response error isn't all we're going to extract the data from

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the response then we're going to pass that data into this function right here which is essentially the

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same thing that we did and our create user account or a function in which we extract the ID color avatar

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name email name past those into the function over in our user data service which is used to set the

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private privately set variables inside of our user data service.

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Okay.

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And then appear in our create user we can do a little bit of refactoring here as well.

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So I can delete this and say self not set user info data and then Pessin the data right there as well.

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All right so we're going to save that.

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And now we have a way at any point to as long as we have a valid email to make an API request and retrieve

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the information for that for any specific user.

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Just by passing in the users e-mail right here.

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OK.

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So let's let's use that over here in the log in view controller and we haven't actually done much working

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here so we're going to need to add a bunch of outlets and do some work here.

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All right so the go ahead and do that.

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First let's go ahead and add a spinner and just like we did in our create an account we're going to

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win our right pane search for activity indicator and I'm going to just drop that in right here and we're

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going to say look this attributes inspector said the style to large white and then change the color

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to our purple that we've been using then I'm going to select the line constraint right here and say

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horizontal and vertical in container and then I'm going to go to the size inspector and select the align

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center to Y and enter in minus 100 as a constant.

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And that just pop it up for us right there that looks good.

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And I'm going to save that and then I'm going to open up our assistant editor by holding option and

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clicking on the log and we see right here we go and we are going to need outlets for the username password

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and the spinner.

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OK so can I create a little section for outlets and the user name label or text field selected and control

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dragging.

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And I'm going to call this user name text it connect and for the password same thing control drag and

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I'm going to save password text to 60.

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And finally for the spinner I'm going to control drag and say spinner I'm going to connect those.

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And then see here close pressed created Count button looks like we also need a log in.

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OK.

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So we're going to just put that right here holding log in control dragging and I'm going to say loggin

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pressed.

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Change that to an action.

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And that looks good.

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So connect.

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All righty then let's go ahead and go back to our standard editor and let's get to work.

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So let's jump back into our log NBC and do a little bit of you I said up first just like in our create

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a count b c we're going to want to change the placeholder text of of these two text fields.

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So let's create a function for setting up the Wii U and I say phunk set up a new hand instead of writing

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all that out.

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Again I'm just going to go back into our create a count b c and steal a couple of these and I'm going

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to copy that and jump back into the log in VC and paste that.

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And then just replace looks like that was already the same and replace this one here username and change

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the placeholder text to password.

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And that should be good.

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And then we're going to hide the spinner to start out.

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So spinner is hidden is equal to true.

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And I'm going to save that.

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So now the last thing in our log in the see that we need to do is that well first we need to of course

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call the function that we just created.

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I always forget that one set up you right here.

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All right and then here for the log impressed.

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So what's going to happen when we press the button.

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We are first going to log the user in with the username and password that they entered then we are going

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to go through the off service type instance a logging user where we will log in through the API which

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will return to us the users email and the token we save those into service and then we use the find

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user by email to go ahead and populate all of our user data service information that we need to do things

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like show the avatars images and usernames et cetera.

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All right.

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So let's go ahead and get started.

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First thing we're going to do is say spinner

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is hidden is equal to false.

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So once we click it the spinner is going to pop up and we're going to start it and the meetings I'm

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going to say spinner that is animating or I should say start animating spinner to start animating.

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And then we are going to make our then run unwrap our username and password.

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So when I say guard let my username is equal to user name

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text come on use a name text dot text where and this is just to do a check to make sure that we have

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that we don't have an empty string and I say user name text text does not equal an empty string and

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it closes right pane.

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Else we are just going to return out of this function and then same thing for the password.

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So I'm going to copy this and paste it and say Pass is equal to.

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Copy this password text that text where past for text or text is not equal to an empty string.

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Else return.

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OK so then we can call our loggin function.

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When I say service instance dot loggin user.

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And we're going to pass into it the user name.

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So this is actually I mean these poorly.

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The user name is not actually the user's name.

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The user name is the e-mail.

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But that's OK.

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This should actually be e-mail.

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So I'm going to change this right here to e-mail.

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There you go.

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All right so e-mail M-Pesa and the e-mail pass.

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We're going to pass and pass them for the completion händler press enter to get our going to say success

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and get rid of that.

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So when I say if success so if the logon is successful then we are going to use our brand new function

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that we just created the find user by email.

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Ok so when I say off service instance dot fine use or by e-mail completion is access and if it's successful

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and if success then we have repopulated our user data service information.

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We now have the Avatar color name the user name and email.

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OK.

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So that's great news.

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And so at this point and we've we've logged in what we want to do is we're going to send out our post

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notification to let everybody know who cares that we have logged in that the user data has changed.

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So that's a good notification center that default dot post and see here.

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And this is the one we want right here.

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So the name is known to have underscore you the data did change and the object is new.

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OK.

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Can say that.

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And then just a few of the things that we want to do.

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We're going to say self that spinner that is

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hid in is equal to true self that spinner.

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Stop animating.

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And then lastly we're going to dismiss so self-taught dismiss animated as true and completion as well.

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All right.

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Wonderful to save that.

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And I think that's actually everything that we need here in the log and B C for now and forever actually.

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So I think this one is done.

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Yeah let's go ahead and test it out I'm going to run it.

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All right.

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So when I open this up press log in and log in here at E dot dot com password 1 2 3 4 5 6 and log in

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spinner up just like we wanted.

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Oh hey there we go.

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All right so we are successfully logging in or going to log out and just try that one more time with

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a different g g dot com.

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One two three four five six.

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And there we go.

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All right so we have logging in covered.

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OK.

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But I want to show you something if you do commence shift and go H.H. then you get this here so I'm

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going to close our app so close it and then I'm going to reopen it.

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Now we were logged in right.

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We were logged in as Johnny B.

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So I just reopened it and you would expect you know from your normal use of other apps that we would

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you know still be logged in.

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And we kind of are because if you see here the Boullion is still set saying that we're logged in but

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we don't have any of our user info or anything.

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So we need to fix that.

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So we're going to do that is here in our chat.

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See what we're going to do is when we load up the app we're going to go ahead and just do a check.

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So I guess we're going to do a check if we're logged in and if we are then we're going to go ahead and

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call that function the find use or by email do our post notification that user data has changed.

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And that should that should get us going in the right directions.

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I want to say if off service come on if off the service that instance that is logged in to if we are

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logged in then we are going to call the office service instance dot find use or by email function.

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OK.

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Success.

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And so here we going to do is post the notifications saying that we have logged in so user data has

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changed.

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So notification center dot default dot post and the notification that were posting that were the name

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of the broadcast that we are blasting out is no underscore user data did change object is no case going

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to save that.

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OK so this is all hunky dory.

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But if we come in to our channel ABC this this this view might not have been instantiated at the time

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that that notification is fired off.

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So we also need to do is here in my view did appear we need to do a check and set up the user data accordingly.

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So in other words we need to do everything that is being done right here.

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And you did appear so let's go ahead and create a function for that someone to say phunk set up user

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info and to just copy her cut everything out of this.

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Usually they did change and put you right here.

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And then I'm going to call set up user info here and here in view did appear that way if we're opening

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up the app from scratch chat we see loads up the end and we have been logged in previously so our token

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e-mails are saved.

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We're going to find our user information and then when we open up channel ABC here on view did appear

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we're going to do a check here and we're going to say Oh hey I have everything that I need to set up

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the user info for a logged in user.

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OK.

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So let's go in and run that and test it.

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And I think we ended with a logged in users so we up and there we go all around.

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So from a fresh start we we loaded up we got our our user information via that new function that we

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created and loaded up all of our eyes accordingly.

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So that's pretty exciting and if I log out then it goes back and if I close the app and then re open

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it.

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All right and I guess I didn't actually close it.

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See here.

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So closing it and then reopening it and everything should be blank.

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So then we can log in again at 1 One two three four five six and boom.

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All right so great.

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So we have this lesson.

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We created a new function so that we could get the users information based off of their e-mail.

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And then with that information we were able to set it so that we can log in users from the logging page

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instead of having to do the whole create account cycle every single time we wanted to log in.

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And then we also set it up to where if you're launching it from scratch and you have already logged

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in and in the past you don't have to log in again.

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Now it just logs you.

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Logs logs you in automatically.

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So that's really nice.

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All right so we're making great progress.

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I know you guys are probably itching to start actually working with web sockets and the actual chat

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part of this app but sorry about that.

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But this has been a lot of lead up to get into it and but I mean we've learned a ton so far learned

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a lot about web requests using El-Amir fire and working with API and everything.

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So yeah I hope you guys are having fun.

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And just to finish off here I'm going to add our progress make sure that you are doing the same on your

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end and I will see you all in the next one.