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Welcome back again.

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In this lesson I've been talking to you about this split view controller and a split view controller

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is some sort of a controller that breaks your screen into two separate parts where each part is controlled

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by a different view controller.

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It is originally designed to be a controller for having a table views within larger screens.

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That's the screen that you see when you open your e-mail application on a path that you have a table

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viewpoint or on the left side and then the body of your e-mail on the right side of the screen.

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You could do that even an iPhone when you rotate your iPhone and you keep it in the landscape more than

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you got your e-mail application.

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You would have a lot of table view settings on the left side of the application and the right side shows

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you the actual threat of different emails.

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So first I'm going to give you a quick demonstration of how it could work for an application such as

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e-mail and then I'm going to show you are the details of it how it is actually put together.

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So I'm going to go to X code and it will then start a new application.

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And this part you don't need to do because it's just a demonstration.

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I'm not going to explain how it works because we have a whole section dedicated to table view controllers

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and collection view controllers but for now in the new application I'm going to choose master detail

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as opposed to what we usually do.

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I'm going to say this application is actually called temp.

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That's a naming convention I have for whenever I know and when I delete something really really soon.

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And if you're on this application will end up having a table view controller which is something that

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would be the study in the future but you will also have a split view controller.

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Let's see how the two of them they work.

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So if I rotate this simulator.

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Now that is by pressing command on arrow buttons or going to hardware rotate left or rotate right.

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If I do that we would see that we have this a screen that I press on the master.

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Another viewpoint or appears and I can press on that little button maybe I can make this a little bit

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larger as well.

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And I will have these table view cells in here.

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Each of these is called a cell.

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I mean I type on them that content appears on a different view controller which is the essence of having

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a split view controller a screen is a split between this view controller the one that we call mass there

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and the other one which is called detail.

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Now if you're using a smaller device such as a phone the master essentially slides over the detail.

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And if you're working with a larger device such as an eye apart then the master viewpoint area will

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be permanently there on the left side of the screen.

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So that's the design of it.

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Now let's go ahead and see how they do this thing and what you could use it for.

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Like I said it's primarily used for this purpose for having a table view and it's kind of a built in

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feature there but it kind of helps if we know how they built it.

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So if we need it we could make adjustments sweet.

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So I'm going to go back to school and I'm going to stop this application is thought a new one I'm going

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to call this one to be a singer of your application I'm going to call it my split vote just a split

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view controller app.

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So that's my Smith your controller app.

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And the moment it load I'm going to head into my storyboard and design this split view controller.

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So the first thing I'm going to do is and delete this view controller.

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I'm going to say I have a split view controller which is somewhere up here.

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This one at the moment you did I guess with your control is going to bring a lot of his stuff with it.

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I'm actually going to delete everything except for this one which is the master of this split.

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You're going to read that shows the master of your controller.

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So I'm going to delete the route view controller the navigation controller and this other view controller.

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So we are left with this one which is of the type split view controller.

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Now I want to build everything on my own.

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I want to see how these two different things are actually connecting to each other.

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So I know for a fact that the split controllers they require at least two view controllers and master

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view controller and a detailed view controller.

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So let's go ahead and add those two.

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I'm going to say I have one view controller.

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Let's make this one be perhaps a brown color.

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So I'm going to say this is my master view controller and then I'll have another view controller.

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I'm going to put it in here.

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Let's say this one is maybe it's like this color maybe it is pink.

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So that's going to be my details a view controller.

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And now I'm going to go ahead and select this view controller hold controller and I go over here and

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say the relationship is mass their view controller for the brown one.

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And then when I repeat the same process for the pink except that this time I'm going to say the relationship

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is detailed view controller.

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So now each of them is one of their view controllers of this split view controller.

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And since I don't have an entry point to this story of what I'm going to select this great view controller

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say it is the initial view controller.

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So by now we have this setup.

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And surprisingly my pink view contrary is showing me a navigation bar and that is because the design

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of a split view controller expects this view controller to be a navigation controller.

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So it's best if the embed the pink one within a navigation controller.

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So I'm going to select the pink one that is my details of your controller and say Ed embed in a navigation

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controller.

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And that's just like the bare basics of having a split view controller that has one master view controller.

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One detail view controller.

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Now I will run the application up until this point just so that we can see what we get so far

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so now that my app is low that I can see that on the left side I'm seeing the brown view controller.

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That was the master of one on the right side.

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I see the pink one there is obviously only visible when my application is in the landscape mode.

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If I rotate back I will only see the master view controller and that's a very good design because in

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a poor state and with it kind of doesn't make sense to see a split in the screen.

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There isn't enough space for doing this bit of a vertical split essentially.

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So let's go ahead to code and see what else we could change in here.

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Something that is quite important and you might have noticed is because each of these scans are taking

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apart of the size of this quarter the screen it makes sense that we set alter layout and constrains

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for anything that be making it.

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So I'm going to keep that in mind.

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So the first thing I want to do is I want to be able to have something in my master view controller

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that controls something in my detail view controller.

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So let's say you have a button here in the brown that controls the text somewhere on the on the pink

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and if you manage that then we can manage anything similar as well.

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So we're going here to the brown one.

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Say I have a button.

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So let's find that by then when I place it here.

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Say it is like that.

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It also has a pink bygone color so it kind of says what it does and says change it to something and

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then I'm going to set the constraints for it.

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A space leading the space trading the space on a height and height.

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I'm also gonna go ahead into the pink view contour and add a label.

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So in here I'm going to say I have a label I'm going to place it in here.

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Say my label is something like that it has a different bygone color.

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Maybe you're right.

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So we can't see what's going on.

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A bit of a larger text.

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It has the same height always it has a trailing and a leading space because it tries to intrinsically

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find the size of it or infer the size of it from the text.

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It kind of shrinks it so you have to go to the auto layout and manually change this number to whatever

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you want which is 16 in this case.

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And I'm going to say it has a tougher space for a safe area.

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So now we have the label as.

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The next thing we need to do is we need to have two viewpoint or classes.

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I already have one which is the view controller I'm going to delete that so I don't need that one but

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I do need is two new ones.

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One of them is going to be command and talk with each class is going to be a you eye view controller.

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It's going to be pink your controller

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and then I'm going to add another one corporate touch glass.

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I'm going to call it brown view controller of the type you have your controller.

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So now I have two view controllers.

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Each of them for one of their view controller outlets in my storyboard.

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And when I go for pink one say the class for it is actually pink view controller.

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I'm going to select the brown one.

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Say the class for it is obviously the brown view controller and then I'm going to go to a split screen

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to add some items in here.

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So in the split screen I'm going to say for the brown one I need to have an action for the change it.

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So I'm going to come in here and say change it has a function or an action called let's say.

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CHANGE THE TEXT function at that one then I'm going to go with the pink one and say the pink for your

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controller.

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And obviously the corresponding pink view controller class I'm going to have an outlet for it that says

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my label for instance.

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So far we haven't done anything that is completely new.

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We haven't done all of these things in the past.

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And then the next thing that is important is how are we going to make a change here on this label.

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Then that button is clicked and what comes to mind is obviously using a delegate pattern.

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Having a delegation that when this is tapped that one uses the delegation information to change itself.

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There is either a little bit of a problem with that and that is so far whenever the use of delegation

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pattern.

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We had a Segway between the two view controllers.

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We had a weight that in a prepare for Segway.

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We could for instance say the peak of your controller that delegate is equivalent to self of the brown

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one but we don't have that in here even though we could write the code for it.

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We don't have a Segway directly between these two and even if we had that since we never execute the

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Segway we will eventually never have it actually happening.

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Today I want to say that let me actually show you the power of the court and how we are going to use

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it and then see what problems we run into.

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Let us set a new fight.

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I want to say a new Swift file and this is going to be called my protocol.

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So that's my protocol.

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You could essentially call it anything that the insider feed the content of it are what matters.

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So here I am going to say I have a protocol on this protocol I'm when I call it are changing text in

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pink delegates and this one has only one function.

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And that's what function is.

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Change that text to.

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And I'm going to have to receive an input text which is of course a type a string.

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And since we're in a protocol we don't need any body of the function of course.

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So this is the protocol I want to use.

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So the way I want to use it is I want to have this as a variable for my pink view controller and then

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I want to be able to use it somebody in my brown view controller.

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So let's go ahead and do just that and let it go to my pink view controller and say up here I have a

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variable and what I call it delegate as usual which is of the type change text in pink delegate.

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So this is a delegate for my pink view controller which whoever calls it they can change the text.

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Now I'm going to clean everything else so they know I don't need I'm going to get rid of all of these.

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I actually don't need to viewed it Lord.

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So the only thing I need are these two outlets essentially one is the delegate and one is the labor.

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Now let's go to a brown view controller and if you recall we always had a situation like this when the

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change text was happening when this action is happening somehow or pink view controller dot delegate

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should have called its method which I don't remember what it was called.

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The problem is we currently can't do that simply because there is no relationship between the brown

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one and a pink one.

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There is no way between them.

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So in in practice there is no way for us to get access to this guy.

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We can have a pink view controller which is this ring view controller.

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The destination of a storyboard.

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So I could in theory do this.

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I could go ahead and say let my ping V.C. become a pink view controller and then maybe in my view did

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Lord I could go on initialize it but that will have nothing to do with the pink view controller that

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is being displayed on the other side of the split view controller.

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So that is the problem that they're facing right now.

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And to solve that I'm going to say let's do this entire thing with the delegation within another view

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controller that controls both of these and has a relationship with both of them.

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And that is a you eye a split view controller.

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So I go back to my brown and clean of.

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I don't need that.

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I'm going to start a new file a corporate touch class and this is going to be of the type you eye a

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split view controller.

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I'm going to call this one my split view controller.

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Now this newly created a split view controller it doesn't really do anything for us.

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The only thing it does it introduces.

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Which one is the brown view controller.

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Which one is the pink view controller.

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So I'm going to go to a storyboard and say this find this outlet.

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It actually has a class which is why a split view controller.

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So it now knows all of the connections that are happening here in the interface builder.

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Then I'm going to head back to a split view controller and the first thing I'm going to do is I'm going

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to get two valuables.

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One of them is going to be called brown and white brown is it brown view controller and then I have

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a valuable hinge and that is a pink view controller like that so far in my split view controller these

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two are just mere variables.

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They have no relationship with the destinations of the two seg ways in my story storyboard.

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So that's something I have to still define it and I do that in my view did lowered by saying I have

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brown to be self not view controllers.

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That's an array of view controllers.

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The 0 1.

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That is the master one as Brown's view controller.

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So I'm saying get the brown to be of the type Brown view controller from the first view controller of

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a split view controller which is true because the very first one is the brown one.

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Now forgetting the second one with a pink one we have two things a little bit differently because the

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second one actually is not the pink view controller.

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Rather it is a navigation controller.

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So let's see how we take care of that.

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I'm gonna go in here and say pink is going to be self DOD view controllers.

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The first one which is the second one.

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Essentially I'm going to give it as a you eye navigation controller.

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I know that's the case again from this UI navigation controller I'm going to say

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here get top view controller.

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I'm going to get that top view controller as a ping view controller.

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So once again from the self you controller.

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The first one is a navigation controller.

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That navigation controller.

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It's top view controller is a pink view controller and that becomes my pink one.

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Once I have the pink I could do this and this is what we have been waiting for.

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Pink Dot delegate to here.

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And since I'm trying to delegate to year I have to conform to the protocol.

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I'm going to say the protocol is changing text in pink delegate and once a conform to it I have to include

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the methods of it or it stops from it.

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And here is that method saying change takes two.

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That's all I have to have in my split view control of everything else I can delete because we don't

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agree.

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Not like that I can properly delete like that.

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So now they change the text.

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What should we do in change the text in here.

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Remember this is a function from the delegate.

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It already knows where it has to apply itself and that is the pink.

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So I'm gonna say pink dot my labor dot text becomes whatever value you receive.

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Now this is the beauty and this trend of using delegation partners in our U.S. because they split your

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controller has nothing to do with the pink or its Labor or even brown or the delegation is just a controller

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for all of these guys and the relationship between them.

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Once it is said it essentially allows you to do any kind of communication between all of these different

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view controllers.

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Which is really really powerful in many many situations.

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So now we have our brown our pink view controller automatically finding the value for its label from

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the delegation.

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The problem is nobody so far has called that delegation and that's the next thing we have to do.

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We have to go to a brown one and say here's a vendor function is called.

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We have to somehow call the delegate from the pink.

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So let me read everything else because we don't need any of those guys in here.

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We have to call the delegate from pink but pink isn't even yet.

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Pink is somewhere else in a different view controller called mine a split view controller.

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So you have to get it like this.

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I'm going to say s this view controller dot parents.

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I'm gonna get its parent independent of it I'm going to get it as my split view controller.

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So so far we found the parent of the brown one the parent of the brown one which happens to be this

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guy.

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Has someone called the pink.

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So I'm going to go in here and say the parent that pink.

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The Pink has something called delicate dot delegate.

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The delegate has some function called Change takes two and now we can enter a string or you can have

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a text field or anything that you want.

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I'm just gonna manually change it to saying this is sent from.

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Now let's go ahead and run the app and know see all of these things in action and do a quick recap and

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I'm actually going to change something in here just so we can see how it works.

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So right now when I type on the change it this label should show the message we are trying to send which

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is this is from Brown.

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It says this is sent from Brown.

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Now I'm still seeing that navigation bar over there.

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There's something I don't want to have because I don't really have a navigation happening in here.

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So you could actually get rid of that in your pink view controller.

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You could go in here and say view it Lord or actually if you will up here would be a better one.

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You will appear super.

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That view will appear through and then either I'm going to say self not navigation controller not navigation

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bar that is then.

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And that is true.

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So the moment the view Lord I want it at the moment view will be low the loading will appear.

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I'm going to get rid of the navigation bar to make sure that we don't have that you know a space being

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wasted for no reason.

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So it's rotated again and like that we have to change it and that's working like that.

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Now they say they want to change something and that's not really necessary but they want to show you

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how it works and when go twice with your controller.

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And I'm going to say we always do the delegation to self.

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Is that a way to do a delegation to something other than self.

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And that's absolutely possible.

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So in this case I'm going to say pink delegates it's tasks to Brown.

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Now here's what happens.

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You know if you want to do this I would suggest that you actually pay attention to it and then show

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it to do it on your own is saying that the delegation of pink should go to Brown.

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And obviously it's saying Well Brown is not conforming to that you know method.

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So I'm going to say Brown has to conform to changing text in pink delegate rich.

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Now that is happening.

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So in a speech you control this area is going to go away now since I'm delegating to Brown now and the

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Brown is going to take care of the delegation method then this find my split view control it doesn't

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need to do that.

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So I'm going to get rid of that and since this is a function from there I'm going to get rid of that

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as well.

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So once again now we have the brown and pink.

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I'll be fine.

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BROWN I'm being obviously a pink delegates to Brown and Brown has to take care of the everything that

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is in the delegation in the protocol.

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And when I go to Brown and the Brown says well you're trying to conform to this but you are not taking

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care of all the methods.

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Are you sure you want to do that.

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I'm going to say no I won't actually have this method and I'm going to say in this method I want to

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change the text routine.

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Somebody else got somebody else.

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Once again is not here is not in the Brown is not even in there.

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Brown's parents it is in the Brown's parents are their child which is this guy song the copy that say

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self parent has a split view controller that pinch.

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That's my labor.

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That text becomes whatever value we find.

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So if run the application it should work exactly identically to what it used to work.

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Just a minute ago and let's see that we change and that works.

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Now I know I when I deviated away from this split view controller but they found it a good practice

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for us just to get a sense of none of these things are set on a stone.

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You don't always have to have your delegation to point to the self and you don't always have to have

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their methods in there to view controllers that they have a Segway between them.

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You can do it.

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The goal of this course and essentially the goal of doing better programming is getting to know so many

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different methods so you can mix and match them and find the best solution that you can think of going

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back to the original discussion of this less than a split view contours are very useful for situations

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where you want to control one you controller with another one primarily use when you have so many many

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items in like a table view in an e-mail application that each of them has a lot of details on the right

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side of the screen.

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So we will see that far more in advance and more details when we talk about table view controllers in

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the next section.

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But for now you get a sense of how is with new controllers work and how you can essentially benefit

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from them.

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And.

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Yeah let's keep it up to here.

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I see you in the next lesson.