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Right, so let's take a look at our cheap one off WhatsApp clone.



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Now, I haven't cloned all the functionality of WhatsApp because I don't have a year's worth of time



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to do that as a developer.



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But I've made a basic clone here so that you can see the process that goes into it when it comes to



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using Google firebase to store the data, retrieve the data, give you notifications and things like



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that.



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So the first thing we have here is a login or register screen.



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So if I tap register, it'll tell you stuff is incorrectly formatted.



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So I'll just say blah blah at blah blah dotcom.



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And what we are using here is the standard way of logging in with Firebase.



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There are many, many ways of doing it and I'll show you a couple of them, but I won't go into the



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details.



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What we're doing here is creating a custom login.



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So I'm going to hit register and it's going to ask me to verify my password, which I'm going to do.



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And I'm just using the password password here.



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But obviously you can restrict your users so that they don't use the wrong kind of password, something



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to short to memorable, to easily guessed.



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OK, so I'm going to show you all that to our basic app as presented here once we're logged in, because



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once you're logged in, you can access all the functionality of the app.



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You can drop a message down there, say something like, hi there.



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Now, that particular message is going off to Firebase and being stored there.



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And my Internet is currently being a little bit funny here.



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So what I'm going to do is quit this.



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We're having that same problem with quitting again.



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I it is going to remove that, remove that.



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And maybe my Internet will catch up now.



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There's always trouble with the Internet and I simulator's, they always, always, always have trouble.



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So if you have problems, you might have to actually quit the simulator and restart your app through



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X code.



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Of course.



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OK, so we've actually managed to log in there.



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So these are all the messages I've been doing.



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As you know, whilst I've been developing the app, testing things out, I just been typing random characters.



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And when I press enter, there it is, it's appeared.



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So what's happening in the background?



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There is the message I'm typing is going off to Firebase.



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It's being stored in Firebase and it's also being reflected in our current UI.



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There is a live connection with Firebase.



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So if you are on a different device, on a different account or even the same account, actually the



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messages that are typed on that of account would appear here automatically.



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Every bit of data is pushed to all of the devices listening to it just as you get with WhatsApp or message



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or pretty much any messaging service these days.



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I can remember when BlackBerrys first came out and push email was insane.



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It was like, wow, this is the future.



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But now everything runs like that.



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We don't have to poll anything.



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We don't have to check if there are new messages, they just automatically get shown to us.



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Right.



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So that's the basics of the app.



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What we're going to cover and Firebase is how to log in, how to set up Firebase in the first place



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on the web.



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That is, we're going to look at stuff like pricing of Firebase, what you should do, what you shouldn't



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do, how to limit users to certain bits of data, and most importantly, how to retrieve and send data



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in real time.



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So let's begin.