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Welcome back again.

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This lesson is actually an exercise on what you're supposed to be doing is you have to make a shared

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entry form.

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So essentially you have one view controller that has a little text field in it and you can enter a value

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on it.

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And this view controller is shared as a child of your controller in two different view controllers.

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So let's say you have one view controller that because the first view controller and the other one that

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because the next view controller and there is something in between them that is the shared the view

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controller and the shared one has a text field in it.

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Now the challenge that you have to solve is this every time that you enter something on this text field

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and you had enter or the text ends we have to get the value from that text field and represented in

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any view controller that we currently are at.

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So you might be in the first few controller or you might be in the next view controller in each of them

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you should be able to get the value from that other shared the view controller to do that.

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I'm going to give you a little hint that you must use a delegate.

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So that's like the best approach for doing something like that.

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You use a delegate you make your own protocol and you make a delegate that delegates a task from the

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shared the view controller to either of the two of you controllers that you are at right now.

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So it takes some time.

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I try it on your own.

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I hope you know you succeed in it or if you have questions ask me otherwise I'm going to get this started

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on this in just a few seconds as well.

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If you want you can pause the video and try it on your own and then watch me doing

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okay then.

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So I'm going to get this started as well.

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I'm going to go to court to start a new application called shared entry form app on my shirt and a phone

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only has one value that we can enter.

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But that essentially shows us what we should be doing.

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And when I go to my main a storyboard and my main storyboard.

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I'm going to add a new view controller.

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So that's my next view controller.

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And for my next you can control I'm actually going to make a new file or new Coke with each class and

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I'm going to call this one next view controller simply because I have the first one.

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The main one which is here on the left lets me go back to the storyboard which is here and I have the

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next one.

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So for the next I'm going to go in here and say it's class is the next view controller which should

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autocomplete but doesn't for some reason.

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Let me try again.

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Yes.

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Next view controller stop.

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One of them is this first one.

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One of them is the next one.

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And actually the next one umber changes color to be a little different maybe like that.

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Now between this one and that one we need a system of going through them.

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So I'm going to go ahead and say from this one.

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Let's go to the other one.

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And that is by adding a button.

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So I'm going to say by then and that but then I'm going to say it's here.

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It has a background color which is similar and says go to next.

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Now because I'm simulating on iPhone access Max I'm actually going to change my view to the same as

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well.

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So I could actually see exactly what I will be seeing and I don't need to set any kind of strains or

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things of the sort.

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So what changed that.

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I'm going to place this one around here.

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Great.

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Now I have the two view controllers and then I want to have a v to go from one to the other one.

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So I'm going to say from the go to next do this do a Segway show.

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So now it goes for the green one and then for them when I do it I'm going to say I have a container

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you.

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So let's go ahead and add that I'm going to come in here and say container review this container of

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you I'm going to add it to my first view controller.

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Let's say this one about that I have made me this little you know container view controller.

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So I need to add this container of you can't order to my dream view controller as well.

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So what I'm going to do is this I'm going I actually copy this UI if you go in here and paste it.

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The reason I copy paste is because I wanted to get the same size.

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Otherwise there's no real reason for it.

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Then I'm going to go ahead and say this one too.

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There it has a Segway and that Segway is called embed.

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So it essentially embeds one within the other one.

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This is just like how this one is happening.

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If you select the Segway in here and you go up there it says the storyboard embed Segway and that's

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what they did in here.

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I manually made that let me redo that once again from my UI view which has the same size of this one.

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I'm going to control a drag over the view controller and say Segway embed which means it works as a

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container review for this too.

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So now this one is shared between the two of them.

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And the proof of that is if I have a text field and I place it somewhere like here.

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I changed my color so I can see things a little bit easier.

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So that's the color.

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And here is my text with a little bit larger.

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And I'm gonna say it has a place holder saying text and I'm going to make it a little larger.

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Something like that with a different background color perhaps something like that.

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So if you have this now and if we run this application we should be able to see the same view controller

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embedded in here in our main view controller as well as in the green view controller.

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And if that works it means we are one step closer to what we want to do.

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So now we have that text field is there.

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It works.

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I can actually enter values on it.

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Obviously I'm not going to be able to fetch these values just yet but if I go to the next a gain I have

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the same thing and I can see the values in here.

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So the next part of this challenge was this every time I type something and I had to enter I want this

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value to be shown somewhere in this view controller.

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So the first thing is I'm going to add a little label to both of my view controllers.

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I'm going to say I have a label that Labor is going to be here.

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That value is going to be like that and maybe a little bit larger a different background color so we

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can actually seat.

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I don't want to copy that paste it in here as well because we want to be able to see the same thing

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in two different places.

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Now I need to add some programmatic matters.

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So the first thing is this I'm going to add a new view controller for the share of the one I'm going

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to say command and this is going to be shared the view controller.

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So that's my shared view controller and I'm going to come back to my main story board say this is actually

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the class of it is a shared view controller.

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Now I have that one taken care of.

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Then I'm going to head to the assistant window and in here I'm going to say for my view controller.

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Here are the things that I want.

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That's the main view controller obviously.

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I want this label.

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So that's going to be called Main label.

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And then I'm going to go ahead and select the other one.

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The next view controller I'm actually going to do the exact same thing I'm going to say in the next

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one.

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There's also someone called NEC a main label so main labor.

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So I have the two labels taking care of then the next thing I need is with this guy.

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They share the view controllers in the shared view controller.

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I'm going to go ahead and say there is a value in here which is the text with.

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So that is going to be my or Maine again.

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Text field because they're all separate.

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Each of them has its own class.

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It doesn't really matter what you name them as long as you know what your naming them.

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So let's go ahead and you know change some of stuff in here.

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The first thing we have to do is this.

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I'm going for a shared view controller class and take care of the text field delegation.

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So I'm going to go to a shared view controller and in here I'm going to get rid of all of these and

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I'm going to do these things to say you a view controller.

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There's this superclass of the shared view controller all saw you I text field delegate is a protocol

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that we conform to and since we're conforming to that I can get should return text field should return.

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And every time that the text file should return here the things that they want to happen I want the

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text field to resign its first responder.

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I also want to get the value from the text field and show it in the order guys label the label that

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is in the order of view controllers.

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So that is something that we have to deal with using a protocol and a delegation.

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So for now I'm going to say just return true.

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So that is happening now.

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The last thing I have to do in here before I change this I'm going to say main text field in my view

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did Lord dot delegate to here.

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So it does delegate in yet understands when we had to enter by then let's try that and make sure that

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that's actually working.

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I'm going to go in here and my application and once it loads where they want to do it I want to launch

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the keyboard and I want to see that it does that dismiss and that's going to give me the confidence

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that I need.

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So that's going to be the keyboard.

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I'm gonna say hi and hit enter and the keyboard disappears.

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So that part is working.

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Now it's a matter of sending this message to that label or if you were in the other viewpoint or whatever

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the message is in here into that label.

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So for that we need a protocol.

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So let me go ahead and say I have a newer swift fine and I'm going to call it shared shared view controller

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protocol or you could just simply call it protocol but since you're you know in the future and you make

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larger applications you need to know exactly which one it is.

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So in here in my new file I'm going to say I have a protocol and that is protocol is essentially called

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Shared View Controller delegates.

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Now the reason I call it delegate is because that's a very common practice.

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You don't have to call it delegate but if you remember this one it's called you a text field delegate.

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The other one was called you a picture of you delegate is a very common practice.

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And my delegation has only one function that function says fetch text and the text has no argument as

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a parameter that is a key value which is a string.

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And of course the functions inside protocols they don't have a body.

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They just have a declaration.

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So does my protocol.

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Has only one function.

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Now how are we going to use this.

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I'm going to go into my shared view controller and see my share the view controller has a value event

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called delegate which is of the type share to view controller delegate.

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So this is the delegate from the same type and we can call it whenever we want it.

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So when do we want to call it.

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You want to call the delegation every time the text field returns so I want to say delegate DOT and

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the only function that it has is important to me is fetch text and it's got the same value you're trying

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to fetch takes.

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What is the text.

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The text is text field not text value.

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So what they have done here is this.

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I've said there is a delegation method that features text and sends it to another delegate.

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This guy shared the view delegate whoever conforms to here.

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Now nobody so far conforms to here so far.

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We just send the message to our delegation so let's go ahead and find someone who actually conforms

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to here and those are these guys.

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Their view controller and the next view controller.

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They both have to conform to this.

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Some were go to view controller and say you my view controller shared view controller delegate is a

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protocol in here now it should give me an error saying that hey you have to implement that function

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and that's exactly what they want.

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I want this function to be in here and here's what I want to happen in it.

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Every time that this function sends me a text I want to put that text in my label so I'm going to say

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main label dot text becomes whatever you got me.

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And that's all I have to do in here.

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You actually after the exact same thing for the next view controller the memory format is in here so

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it's a bit tidier and cleaner so we don't have a lot of code going all around.

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So that's that and since I'm being very lazy I'm actually going to copy everything just like this to

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the other sites.

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I'm going to say all of these copy go to a next view controller and say paste everything for the next

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few controller.

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Again I have the main label a gain I'm conforming to share the view controller delegate a gain because

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of the Shared Value control that I get.

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I have to call this function and everything in this function gets called whatever value it finds we

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put in the main label.

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Now let's do a quick recap of everything we have done so far and try to understand what we still need

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to do.

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So we have a shared view controller protocol that this protocol called a delegate is essentially having

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one function that the one function gets called every time the shared one the middle one essentially

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has its text field should the return called when that is called it finds the value of the text field

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and places it within its delegate that delegate.

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It's a valuable of the same type.

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It's an optional day event and it is not yet initialized.

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This is a very important point yet not initialized.

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The reason I'm typing this in here is because I want to draw your attention to it that no one has called

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this delegation yet and that is the last step in our project.

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So we have to do that.

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Now let's assume that is working and if that is working every time the delegate fetches a text it pushes

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that takes to whoever has initialized that and hopefully that whoever is the view controller which is

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gonna show it to us now it becomes a matter of.

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Well there is this delegation going to become initialized who is going to be calling this delegation

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to do that.

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I'm going to go to my viewpoint order and write this.

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I say prepare for Segway.

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So now you might be wondering why are we preparing for a Segway.

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The reason is this you know a storyboard.

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We have a Segway going between this view and that view controller.

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We have another Segway going between this view the green one and the shared view controller.

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There's the skip the one in the middle for now because that's not the one we actually care about.

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These two are the ones that we care about them.

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So one of them is from the main view controller to the shared.

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The other one is from the Green to the shed.

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So let's call them the first one.

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I'm going to call it white.

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Two shared I.D..

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So that's a white t shirt idea and this one is the green.

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Two shared ideas.

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I'm going to paste that and say that actually says Green.

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Two shared ideas.

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So both of these are essentially saying based on whatever we want to do for them we can do it within

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the prepare for a Segway.

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So I'm going to come to my view controller say if Segway dot identifier is a data value here is what

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I want you to do.

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I want you to say let's share V.C. to become Segway.

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That destination as.

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And I'm going to get it as shared the view controller.

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And then I want you to say share.

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Do we see that delegate to here.

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So this is the first time this delegation is actually being implemented.

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This is the first time someone is actually saying well if you made any calls to a function I will respond.

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Let's see that a little bit more visually.

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If you made a call to a function.

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Who is that.

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Who.

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This is the shared we see if shared we see made a call to a function which is this one fetch text.

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Someone has to respond and that someone is the view controller here.

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It says if you made the call to that I will respond to it.

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I will do something that thing in this case is fetching the value and placing it in a labor.

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Now they have that they can essentially copy this entire thing the way it is to my green view controller.

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I'm going to say Copy.

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You don't always get this like you because obviously I plan this things in advance but for you you might

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want to do different things.

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But for me and my next view controller.

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When I'm preparing for a Segway if that secret identifier was green to shared I.D..

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If that was the case then get the shared V.C. to be the same as the shared view controller and delegated

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to here and will be delegated to here.

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We can call this function.

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Now let's go ahead and try our application.

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If it all works I should be able to type something in the text field of the shared view controller and

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fetch its value.

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Show it on my labels.

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Let's go ahead in here and say hi.

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Let's enter that says Hi.

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Let's go to the next one in here.

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Say hi hit enter.

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That's 1 6.

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Hi.

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So that was an introduction to container views.

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Doing a lot fit delegations as well as protocols.

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It wasn't an all round you know application with a lot of things that we have done in the past and we

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get a sense of doing a quick review over them.

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Let me know if you have any questions and let's move on.