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



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



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OK.



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



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it an internal parameter here of query.



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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 alphabetical order but Karl Cayla you know it would show all of the CAA 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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OK 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 we



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had 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 email of type string and we're going to



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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.



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All objects we're going to cast this as an array of data snapshot.



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Moving quickly because we've done this before else meaning if we can't do that we're going to go ahead



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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.



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We cycle through we start appear at the very tippy top with this guy 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 base.



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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 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 thing we can do.



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There's a function for strings that we can type called Dot contains and we can check to see if this



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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 sorry if you look you can see that this returns a boolean So we need to check



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



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to append the e-mail.



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OK the e-mail that we returned.



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The e-mail that we pulled out of our users snapshot.



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Easy as that.



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But what if we cycle through and for instance the account that I'm logged into right now is Harvey Dent



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dot com which is one of these 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 our 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 oh and it's asking that we optional 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 e-mails 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.



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We're going to use the completion 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 an 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 by bloviated load.



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So go ahead and write phunk text field 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.



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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 it



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email for search queries.



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So go ahead and type var e-mail array 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 array 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.



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Table View Dattilo data.



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So it can show the new 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 O.B. Jaycee.



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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 right now of course returning 3 is great but we might have more users



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than that so let's go and pull it from e-mail.



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Because those will get downloaded and we're going to just take the count of the e-mail right now to



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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 daro.



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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 sees of course because there is dot.com.



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How about let's just search for Evan so Evy.



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OK dev slopes of slopes 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 array.



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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.