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Hey everybody this is Caleb with Dev slopes and in this video we're going to actually start searching

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for users based on their email from our data service.

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It's going to be so cool.

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This is my favorite part of the app getting to search for users and add them to groups.

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So let's go ahead and let's pull open our X code project and we're actually going to begin by going

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into the data service because that is where we're going to write our function to get an email returned

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back to us for a search query that we pass in from our YOU textfield.

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So let's go into our data service and we're going to add a function.

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Let's let's put it down here at the very bottom.

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OK we're going to call it phunk get e-mail.

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Meaning that's what we want to get back for.

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Search query.

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We're going to pass in a search query of type string and you know let's actually go ahead and give it

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an internal parameter here of queery.

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And what we want is for it to return an array of all of the potential emails.

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Let's say that we searched C-A maybe we would have Carl Cayla.

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That's not an alphabet order but Karl Kalib you know it would show all of this C.A. starting emails.

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So we need an array returned back to us of all of the potential options.

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So to do that since we're dealing with firebase we're going to need to use a completion handler that

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is escaping.

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So it's an escaping closure that lets the values escape out of the closure and we can pass it back to

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this function.

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So let's go ahead and create a handler.

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And of course like I said it's escaping.

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Now we've done this like 100 times in this course and we'll do it a few more times but we're basically

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creating a function that we can pass values into and we're not returning anything to this.

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We're not returning anything to this function explicitly but we do have access to it whenever we call

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it from somewhere else.

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So like I said we're going to need an e-mail array.

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So this is going to be an array of type string.

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Ok lots of strings lots of e-mails and we're not returning anything to this function but this function

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will be available to us wherever we call it.

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Go ahead and give it some curly brackets.

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And I want you to notice here in the GET ALL feed messages function.

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We created an array of message at the very beginning then at the very end after we had filled it.

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We'd handed that back to our handler.

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We're going to do a very similar thing here.

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So I'm going to go ahead and create an e-mail array similar or actually exactly like what we need to

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return at the end.

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So go ahead and type var e-mail array and it's going to be an e-mail of type string and we're going

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to instantiate it.

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Now we're going to go ahead and look through our users reference and we're going to write a for loop

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that's going to search through all of them and return the ones that match our search query.

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So go ahead and call ref users and we're going to go ahead and observe every user.

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So we're going to observe the whole reference and we're going to watch for values.

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Now if you've never used firebase before I probably should have explained this but value means any data

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changes at a location like our users reference or recursively at any child node.

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So we're not going into a child here specifically not a specific user yet.

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We're just looking at the entire reference for all of its values and we're going to go ahead and get

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a snapshot bakso press enter and I'm going to call this user snapshot.

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OK.

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So now that we are observing the user snapshot we're going to go ahead and we're going to create an

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instance of user snapshot and then we're going to loop through it like with a for loop.

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So go ahead and type guard let users snapshot equals user snapshot which is the one we passed in here.

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Children not all objects we're going to cast this as an array of data snapshot.

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I'm moving quickly because we've done this before else meaning if we can't do that we're going to go

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ahead and just return and get out of this function.

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All righty so assuming everything is good to go we get some users back.

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We're going to go ahead and look at that user snapshot and we're going to go ahead and type for user

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and user snapshot.

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Now we're going to loop through every single user and we need to actually take the user and pull out

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their e-mail.

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If you remember in our firebase array we have a bunch of users here and each user has a unique ID an

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e-mail and a provider.

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We're going to pull out the e-mail and save it into a constant.

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So go ahead and type let e-mail equal user OK so we we cycle through we start appear at the very tippy

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top with this guy.

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Maybe it's not going to open up.

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Interesting let me refresh.

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Looks like it's a little sleepy sleepy firebase.

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There we go.

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OK.

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So if we open up this user we can cycle through and we can pull out his e-mail.

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So the key is e-mail and the value is Marty.

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Great Scott dotcom.

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So go ahead and type user child snapshot.

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And of course the child that we want is called e-mail.

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Now we don't want that though we want the values that we're going to type value and we're going to cast

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that.

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We're going to force cast that as a string because it comes in as a value of any.

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So we're going to go ahead and forecast it to be a string.

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So we now have the e-mail of the user.

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And now this is where we're going to check to see if the queery let's say we passed in CA we're going

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to see if the e-mail contains that in any way.

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So we're going to go ahead and type if e-mail.

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And here's a really cool we can do there's a function for strings that we can type called Dot contains

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and we can check to see if this string contains another string.

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So if CA is a part of this string then we can check to see if it's there.

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So check it out if email contains queery what we searched.

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OK.

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If that's true because.

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Sorry.

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If you look you can see that this returns a boolean.

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So we need to check if email contains queery is true then we're going to go ahead and type e-mail array

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and we're going to append the e-mail.

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OK the e-mail that we returned the e-mail that we pulled out of our user snapshot.

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Easy as that.

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But what if we cycle through.

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And for instance the account that I'm logged into right now is Harvey Dent com which is one of these

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what if I cycled through and found myself ok.

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I don't I shouldn't be able to add myself manually to a group I should automatically join a group or

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I shouldn't be able to appear in the search results.

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What I'm saying I shouldn't have to add myself to a group manually.

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So I'm going to also check to see.

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And so if the e-mail contains the query and the e-mail is not equal to my own e-mail and you know how

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we're going to check that we're going to use firebase surprise surprise.

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We're going to go ahead and call off.

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Current User e-mail.

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All righty.

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So if and only if the e-mail contains the query and the e-mail is not my e-mail then we're good to go.

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Now it's yelling at us.

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Oh and it's asking that we optionals unwrap the current user.

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That's fine.

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So this is a way that we can search through and we can create an array of all the emails that match

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a certain search query at the very end of this for loop.

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We're going to go ahead and we're going to return or not return sorry we're going to use the completion

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handler.

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So go ahead and type handler and if you look you'll see it's asking for an array of type String.

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We have one that's called e-mail array.

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Very cool.

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So that's going to go ahead and fill up our array.

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We can return it here to our handler and now wherever we call this we can get an e-mail array for all

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of our users from firebase for the search query that we pass in.

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It's very very cool.

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So what we're going to do is we're going to go head and head into create groups Visi already and we're

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going to go set up how we can use this.

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So let's think what we're doing right now is we are just showing static cells and we'll fix that in

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just a second.

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But for now what we're going to do is we're going to set up our email search textfield to basically

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have some way of knowing when we are typing.

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Because if I type C it should search that query and find all the e-mails starting with see if I type

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C.A. it should update and then show all the text fields starting with CA.

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So we need a way to identify and basically utilize the power of these text fields.

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And so in order to do that we're going to go ahead and conform to you.

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Textfield delegate and let's do that down here.

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Let's type extension create groups AVC and UI textfield delegate.

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OK.

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Now you'll probably notice that if I build and run we're good to go there will be no errors from this

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because there are no required delegate methods.

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But we we can definitely use them to give us the ability to monitor what's going on in the email search

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textfield So now that we've conformed to that we can go ahead and type email search textfield delegate

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is going to be equal to self.

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OK.

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Now this gives us the ability to control and interact with our textfield the way that we want to.

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And the coolest thing is we can set something up that will basically observe and monitor whenever we

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type anything on the keyboard if we type a letter if we delete something it's going to go ahead and

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call a notification every single time that happens.

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And here's how we're going to do it.

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We're going to call email search textfield and we're going to use what's called add target K and add

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target basically allows you to add a target a selector and a control event.

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OK.

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Now the target of course is self.

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It's the UI textfield itself the selector.

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This works just like a tap gesture recognizer or you swipe gesture recognizer.

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We're basically going to call Pound's selector and then whatever goes in here whatever function goes

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in here will be called for a certain UI control event.

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And there are tons of them check this out.

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If I put a period here you can have it be called on any editing event.

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All events all touch events editing change editing began.

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Touch cancel touch drag.

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There's tons of them.

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But we're going to use editing changed because we want to know are letters being added.

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Are they being removed et cetera et cetera.

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So that is what we're going to do.

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The target we're talking about is editing change that's how we're going to monitor what is happening

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in this textfield.

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Now we do need to write a function that will be called every time that the editing is changed and we're

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going to write that right here right bloviated load.

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So go ahead and write phunk text textfield did change.

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And this is going to be our own function.

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Now in this textfield we have two things that we need to think about.

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Obviously when we're typing text it should be searching and updating an email array.

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And if we delete everything back down to nothing if we remove all the characters it should clear the

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array and it should reload the table.

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The table view.

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So there are no cells.

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So we're going to basically check to see if it's empty.

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It's going to empty the array and it's going to reload the table view if it's not empty it's going to

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do the search and we're going to fill an array in this view controller.

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So we're going to start by typing if email textfield text is equal to an empty string meaning if there

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is nothing in the text field we're going to go ahead and just reload the table view table what is it

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called oh yeah is Table View.

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OK.

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Table View reload data.

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Awesome.

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But what if there is still data that is accessible to this table view it's not going to clear it out.

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So we actually need to create an array that our table is going to pull from and we're going to do that

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very similarly to how we've done this in view controllers in this app in the past.

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We're going to create an array in this view controller and we will fill it up later when we call get

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email for search queries.

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So go ahead and type var e-mail IRA and this is of course going to be an e-mail array of type string

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and we're going to instantiate it from the beginning.

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So that's good.

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And now we're going to go ahead and we're going to just say if the search field is empty We're going

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to make sure that the e-mail array whoopsies e-mail array is also empty because then when the table

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view reloads there will be nothing displayed in the table view.

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But what if there is something in the text field so else if there is something in the text field what

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we should do is call data service instance dot whereas our function here to get email for search query.

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Now where's that search query coming from.

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Our textfield.

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So let's go ahead and let's call e-mail search textfield text and we need to unwrap it forcefully by

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the way.

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It'll give us an error if we don't.

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And that's how we're going to pass in our search queries so every time that it's edited we're going

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to go ahead and pass in whatever it says.

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So if I type a c it's going to search for all the e-mails and update the table view if I type C-A it'll

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update it again and show that all the current emails.

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Very very cool and totally realtime.

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So this is where we're going to use our handler to return our e-mail array and fill up the one in this

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view controller.

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So go ahead and press enter.

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We'll call this e-mail Luray and we can basically set it up to be like this self e-mail IRA meaning

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the one that we have in this view controller is going to be equal to e-mail array meaning the one that

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we get returned Let's call this return e-mail or just for specificity returned e-mail or right.

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Awesome.

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And once those e-mails come in we should call self table view not reload data so it can show the new

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search.

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Now of course this function is going to do nothing unless we call it from our selector.

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So let's go ahead and call textfield did change but watch what happens when I try to build it.

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If you've ever used you I tap gesture recognizers you know that you need to expose the function to Objective-C.

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And so we can do that by simply clicking fix or typing at 0 BJC.

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So I don't know about you but I want to go test this out.

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There's only one thing we need to do to actually make this work and that is to set up our table view

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to actually pull from the e-mail array.

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Now of course returning 3 is great but we might have more users than that.

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So let's go and pull it from e-mail array because those will get downloaded and we're going to just

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take the count of the e-mail right now to get each user's e-mail.

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We're going to go ahead and we're going to use the index path of the table view to pull out the right

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e-mail from our e-mail right at the right time.

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So for every e-mail we can go ahead and just type email right and we can pass it the index path.

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That way if we have the first cell it's going to pull out the first user from the e-mail array and pass

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that in as the proper cell.

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Now later we're going to set up the selection status but not right now.

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Let's go ahead and build and run this let's go see if our search function works properly.

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Let's go see how we did.

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All right.

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So here we go.

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Let's pull open our simulator here.

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Firebase for now.

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OK.

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So go into groups and if we pull it up there's nothing so we shouldn't see any cells.

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But as soon as I open it up let me type A C.

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Ok cool.

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All of these users have Cs of course because there is dot.com.

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How about let's just search for Evan so.

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OK dev slopes devs slopes.

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But how about Evan himself.

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Awesome.

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So Evan shows up singularly And if I erase it updates the search every single time.

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So Mark Marty and Mark both show up because they start with a R and Marty only shows up.

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That is so cool.

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OK so our search is working beautifully.

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We can now search through all of our users and oh let's let's see what user we're logged into on this

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account.

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Let's double check.

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I have not yet set up the dismiss function.

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Looks like we have it here actually in our view controller file and we go back and set that.

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My mistake

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OK so close button was pressed is supposed to dismiss the view controller.

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So go ahead and type that dismiss.

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Animated is true.

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Completion is nil.

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Now Dunbarton we're going to save that later we have a function to create a group and to save it up

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and firebase but we're not going to use that yet.

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So for now we're going to go ahead and check to see what user We're signed in as and we're going to

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try to search for ourself because remember we shouldn't be able to find ourselves where say we're logged

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in as Batman.

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Gotham dot net so let's go search for us.

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Let's see the Bat Man.

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OK good.

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So we can't find ourselves because that's our user that we're trying to create the group from when we

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click done later we're going to add ourselves into the group.

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But for now when we create a group it's only going to show us the accounts that we search for.

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Super super cool guys this is amazing.

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In the next video we're going to set up our table view cell so that when we tap add group when we search

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for an e-mail and we select them we're going to set it so that the check mark shows it's going to be

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hidden by default.

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Then what we're going to do is we're going to set it so that when we select a person their email is

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going to be added to this label.

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And so we can search back we can go find another person at Marty at Harvey ad Chuck and they will all

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show up in the survey.

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Then when we click done it's going to go ahead and it's going to create a group upload it to firebase

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and then that will be that we're going to start that in the next video it's going to be super cool.

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Again guys this is one of my favorite view controllers.

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I think it's the coolest one in this app.

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So get excited we're going to head over to the next video and set that up now.