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Right, so here I am in the main view controller and I've just added a little bit of code here, which



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constitutes the function to log out, and I did that just to check the authentication, because I discovered



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that even if you delete the app and then you reloaded, I guess it has the same app identifier and device



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identifier.



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Therefore, Firebase just keeps it logged in.



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So, you know, that's quite a seamless user user experience, isn't it?



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You delete an app and then you come back and you've still got your login details and you're still logged



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in just pretty handy.



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So to log out what I did was this auth function or sign out, and that's to do with Firebase.



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This can give an error.



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So we have to put it in this special structure called a Dukat.



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And inside of there, we're going to try that.



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And what that means is if it throws an error, which it will if there is one, then we are going to



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catch that error here and we can do something accordingly.



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We don't actually have to do anything at this point because we're not letting the user we're not telling



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the user, not giving the user an option to log out.



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It's just for our own internal use at the moment.



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Right.



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So that's how they log out and that's how we get back to this point where we can see that the login



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screen and if we tap stuff, everything's too short, etc..



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Right.



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So what are we going to do?



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We're going to go to auth view controller and we are going to look at the create user section.



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So we've created the user.



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And if the error is not equal to now, we're going to tell them what the error is.



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Otherwise, it's clear that the user has been created.



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So what we can do is call self-taught Dismas on The View controller and we'll have a nice animation



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to go with it.



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And on completion, we will do nothing.



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OK, so at this point we know we're logged in.



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We'll have a nice animation to log back to go to the previous screen.



32

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OK, we don't want the user to have to press back.



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We just want it to happen seamlessly.



34

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Right, so I'm going to put in another random email address and a random password, and then I'm going



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to click register.



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And we're in now, it's up to you if you want to show the user that they are logged in, that the registration



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was successful, sometimes it's I find it's not actually that necessary by mere virtue of the fact that



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they can access the screen where they can type messages, eventually, they will then know that they're



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logged in.



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So I think that part of the registration is pretty much done now.



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We need to look at the login section because we've created some users.



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We need to see how we log them in.



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So we want to get, again, our email and password.



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And I shouldn't be copying this, but I did it, so don't tell anyone.



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We can always get that from a different function if we wish later on.



46

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So let's look at how we lock in a user.



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Let's see if we have a login.



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No, we don't.



49

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Do we have a sign in?



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Yes, we do.



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So we want a sign in.



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That's an email with the email, link with email, password and completion.



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That's the one we want.



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So with email, of course, his email and password is the same.



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And then on completion, we should get some sort of result.



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What is that code?



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I assume it's going to be the same as the registration.



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Let's see if we get an error.



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And if we don't, that should be it.



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OK, so we're logged in, what do we want to do at that point we want to dismiss.



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So what I'm actually going to do is down here somewhere, I'm going to cut this code to dismiss the



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controller.



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And I'm just going to because dismisses a taken Keywood, we know what actually we can just have dismiss.



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We don't have to have self dismiss and we can just copy that.



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This one I don't mind copying because this hasn't changed since forever.



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So if we've signed in, then we're all good.



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Now it insists on having self, I should have known that, and it wants self because we're actually



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enclosed in this anonymous function and if we don't have self, we're going to have an error, as you



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can see.



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OK, what we do need is to also copy over this section to the login.



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So we're going to show an alert error and then just give the localized description, OK, so now if



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we run that, we should lock out the current user when it first loads and then we'll try to log in first



73

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with something that doesn't actually exist yet.



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So whatever at whatever dot com would be nice if I put an ad in there and then whatever password.



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So login, there's no need to record correspondence, identify the user may have been deleted.



76

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Wow, that's real friendly.



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OK, what if we register this user and I'm just going to give this a password of the word password and



78

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I'm going to copy that.



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It's going to register them and we're in.



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OK, now I'm going to run the app again.



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It's going to log that user out and ask them to login.



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So we're going to use that same user.



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Log-in.



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And there we go, we are in.



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OK, so that's pretty much the end of this little section.



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But I would say if you want to really snazzy up this and I think we will do this actually, because



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you should be pretty advanced now to the point where we actually want to build nice user interfaces



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for users.



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So what we're going to do in the next section is change the login and register buttons to be disabled



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or change them to a spinner or something like that.



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So the user can't access anything.