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So welcoming and following from our previous lesson in this lesson we're going to talk about segues

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in more details.

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We're going to learn how to make segues between different view of controllers and also how to call them

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programmatically.

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We don't learn something that's called an unwind the segue.

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So let's get started with that and then we're going to exclude.

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I'm going to close this whole project and start a new one.

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This one is called Single vilification secure Vai's up and in my segues are what I'm going to do is

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I'm going to build two of your controllers.

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I'm actually going to build three of them and I know we've done this before but I'm actually going to

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go to everything once again so we kind of remember the whole process.

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So what is going here you don't have to do it this way if you're a female constable already or you can

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do it the way that we had in the previous lesson.

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But if you want to follow me along on you know get a sense of how things are happening.

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I'm going to go in here and say give me all these three files and delete all of them.

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I'm going to move all of them to trash and then the next thing I'm going to do is I'm going to rebuild

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all of them.

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So first of all I'm going to make a new cocoa touch glass and it's going to be a view contour I'm going

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to call it the main view controller.

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And that's been there and then a lot.

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And needed an added to my project because I was in the wrong place.

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I'm just going to drag them in here.

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Everything is going to work and I'm going to either another one or another one come on and I'm going

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to call this one second the View Controller.

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Again it's a subclass of view control I think is an objective c we know all of these things and I'm

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not making an X I'll be fine for it.

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And we show you that in the Terdiman.

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So file new file or command and and then when we get in here coke with each class and is not it does

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not have any type you find that this is going to be my turn to view control the

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I know this a beautiful long way around but I find it that is deconstructing iPhone apps always helps

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the students better understand what's going on.

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So he's learned language and I'm going to go to all the dot h files and all of that H fun as I'm going

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to remove everything I know I'm not going to need.

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So he's basically importing a kit and having an interface.

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So a game might at age for the other file which I don't even know what's its name.

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Are you like kid on the interface.

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Undeterred we have control of the same thing.

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Not the pound sign.

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Remove that and live with the DOT M-4s going glowering move almost absolutely everything.

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So I don't need any of these guys not even the view that lower the view that lot is there for us so

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we can use it.

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Boy doesn't have to be there.

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So I'm going to remove everything here as well in all the dot m fonts.

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So essentially it becomes an interface so I can view a controller and implementation's I can be a controller.

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Soon enough we'll will learn more about the classes and how do we do these things and what do they mean.

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But for now I can imagine that the interface the Declaration and the implementation is the definition

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of that class as coach will tell you controller do the same exercise and well remove everyone so clean

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on you know everything is the way we want it.

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Now remember we used to have a file called the main storyboard and I removed that one so I'm going to

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have to add in US storyboarded as well.

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So I'm going to have command and I'm going to go in here and say a storyboard.

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That's what they want to add in here.

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I'm going to say this find this card or you could quote it again main or you could call it say my visualizes

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or just my or whatever you want to call it.

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I'm going to call it actually Maine is a very good name for it.

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That's why it's called Maine.

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That is storable.

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But since you're trying to rebuild everything.

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I'm actually going to call this one.

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Art Inish or home home are the story.

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So now we have a file called home that a storyboard and there is nothing in it.

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Now if you remember I could actually go ahead and add the view controllers.

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I could go against a library say one of your controller.

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I'm going to put it here.

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That's going to be for my main view controller another view controller.

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This one I'm going up with it for my second view controller and another one that's going to be my turn

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to view controller.

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So essentially rebuilding the whole thing and rebuilding this story was building the real control is

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almost entirely everything.

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This first new controller I'm going to go up here to the identity inspector and I'm going to call this

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one to be my home or so it is called Main view controller and I'm going to select the second one.

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And that's going to be the second view controller on the third one obviously is going to be the third

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view from.

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And since I'm going to do some navigation between them I'm going to have to change some of the colors

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so we can know that you know we have navigated summer so I'm going to make the bag on this one ping

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the back of the last line.

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Let's say green.

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Perfect.

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Now the next thing I need is this one of these view controllers need needs to be my initial view controller

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so I'm going to select this one and say is initially a view control and that little arrow shows up in

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here.

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Now here's a very interesting thing that happened here.

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If if you have been really perceptive you have to be asking yourself this question since I can make

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multiple store reports.

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However the app note which is storyboards should find the app launcher from the storyboard will hold

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onto the initial view controller.

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And that's no magic that summer up here in our app settings.

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So you go up here and you select your app and you will end up in the settings page of it on my screen

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again.

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Your select you up and you see the settings.

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And in here we'll talk about some of these as we go through the lessons.

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But one of the things that we need to know right away is this one in the deployment in for in general

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settings.

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There is something called the main interface his thing which is storyboard is going to be the main interface

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for this application.

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And since I don't have main anymore when open this I'm going to say home storyboard.

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The one that we made ourselves.

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This one.

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So now that's how you choose which is storyboard to be the main a storyboard for your application.

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And of course you can navigate from one storyboard to another one and that's something that we see in

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a few sections and we talked about that you are an obligation toward us.

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So not my story but I have to give you controllers on one of them the white one is going to launch by

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default.

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But what they do want is I want go from one of them to the other one and then from that one to a third

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one and then going back to bowse one a step back from green to pink and pink to white.

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And I also want to see a way forward going all the way from Green back to the white one.

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So let's see what they're going to do.

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I'm glad somebody else is going to be very simple stuff so.

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But then on this Baden's let's say it's got a pinkish background and it's as you go through second through

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cycles and that's the pink you and I thought they gave it bag on the car apparently not OK.

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So I'm going to copy this now.

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My Magic Mouse my mouse always gives me some difficulties happening multiple times.

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I should get a new one I guess.

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So here I doing the new one and this one says go to Tirtha And of course Third is the green one.

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I'm going to change the background of that to be green and then I'm going to have another by then and

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here and this one says

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go to WHY IS MY MOUSE doing this go to Homer on the home is obviously the white one.

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Let's call this one go back home.

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OK.

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And this is the one that is Bangon gets to be the right color once again for some reason my mouse is

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playing a trick on me.

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But you know it's going to come and that's going to be the white color.

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Perfect.

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I'm going to copy both of these.

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All of these are two buttons.

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I'm going to take them to my last view controller.

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The Tirith The View Controller.

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I don't know yet I'm going to have two different buttons one of them is going to be saying go back to

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pink.

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So this one the top one is going to be let me write it.

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There you go back to second which is the Pinchon ping pong ping.

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Right.

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And of course he's got a pinkish Bangon color.

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And I thought I gave it pink.

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So the top one is going to be pink that's as Colback the second.

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And this one says go back all the way to the home.

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You go back all the way home.

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Perfect.

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So here's what I'm going to do.

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Now I know the last time we did this you were actually driving with control from Ibadan directly to

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this view.

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Controllers you stand with that do things a little bit differently.

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And this is how you're going to do that.

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First of all I'm going to make my segues between View controllers.

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So I'm going to select from one view control the outlets to the other one on one to say this is one

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Segway.

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And then I'm going to make another one from here to there.

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That's another Segway sort of segues that we make for we are going you know deeper into the view controllers.

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We're going to make it from one view controller to another one and then from this I can be open for

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it.

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The last one.

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And then we need to know what are the names of those view controllers.

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This one I'm sorry to say is this one I'm going to call it to pink silk.

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And I usually like to end it with an IED because that's an identifier for the Segway.

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I want to call it to ping Segway ID and this one I'm going to call to Green say Devey.

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I can imagine a real life situation you would call this one.

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I not to contact Segway ID or to a story Segway idea depending on what that you can or is going to show

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you.

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Then the next thing is we have to make the actions for our buttons.

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So I'm going to go to my assistant window.

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I'm going to first go to the main view controller on here I'm going to see main view controller that

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age on the function I want to make is go to secant.

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So here we go to two second action.

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That's the first function.

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Then I'm going to go to a pink one and a pink one.

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Of course I'm going to look at this I can view control of that age and here and make it a function or

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an action called gold to turn action.

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Perfect.

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So we have these two taking care of.

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Now I also have another broadening here in the in the second view going or what is pink.

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So I'm going to make another one in here and this one I'm going to call it an action saying go back

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home action.

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So that's the action that's going to take us back home.

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And then in the third one which is the green view controller I'm going along the head you control that

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H and in here I'm going to say this one is an action called Go back to the second action.

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So everything is named an order and they have functions properly.

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Remember this one.

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I still don't have anything for it.

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The one that takes us back all the way to the other side.

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So this first program these guys.

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I'm going to my main view controller that am on here when we have to go to secant.

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I'm going to call a very simple function and that is is being self per form secure way with identifier.

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So you're saying perform a Segway.

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So what Segway would I want to perform this one.

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The one whose identifier is to pink Segway ID.

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So I'm going to go to maybe your point for that and I'm going to say the idea for the identification

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for it is helping Segway idea.

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I don't have a sense that I don't want to send any particular information.

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So that's going to take us to the other one.

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Now let's repeat the same thing for when we go from the Pinchon to the green one.

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Remember the sick race car to dream the Segway I.D. and we already have the function in there.

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So in the second controller when it says go to tared action I'm going to say self perform for the sake

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of a identifier and that's the identifier and my sender is Ned right now in my psyche and The View Controller

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Dot and I also have that go back which you already saw self dismiss view controller.

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Yes I animated it and don't do anything at completion.

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So that's how we can go back and I'm going to have the exact same piece of code for the you control

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that and when we want to go back.

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So that's about once again really quickly from main view.

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Control yourself perform sync with the identifier.

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That takes us to a second that either fire is set in or sake of a in here and then an other cigarette.

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We have another identifier and every time we want to go back we simply call this self dismissal controller.

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Keep in mind dismissing of your control it means in the stack of the view controllers that you have

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gone deeper and deeper as they were nested just go back to one stage.

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It doesn't mean go back all the way to that one or to any particular view contour.

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It simply means go back one step behind.

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So let's run this operation

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once it launches

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I should be able to go from here from the pink one to the green one.

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So if I'm the right one to think on from the pink one the green one.

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And then I can go back to the pink I can go by the way.

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Exactly the baby they're hoping everything is going to work.

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Now the only by then that doesn't work is this one going back all the way home.

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Let me show you how we do that.

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This is the last bit of this lesson is actually quite easy.

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I'm going to go to my art white view control what is called the main viewpoint order.

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I'm going to add a new action manually and this one I'm going to call it low back to home.

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Right.

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And what go back to home does it doesn't it doesn't matter what does that is what kind of argument it

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has.

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And it has a UI.

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The story of your Segway storyboard Segway.

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You can call it whatever you want to call it.

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Now I'm going to take this matter.

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I'm going to go to my dad and I dad as well.

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And again my method doesn't really do anything you could do things in it.

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For instance when you're on winding and you're going back from multiple nested view controllers you

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could actually do things you could send data or whatnot.

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But for now the only thing that really matters for it is that it is there it exists in here now and

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this part is going to become a little bit confusing.

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So far everything we have done we have relied on a relationship between a View Controller of visual

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outlet in our storyboard as well as a view controller class.

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So main view controller that H-1 and very connected to this guy.

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The second view controller that H-1 and they were connected to this guy and the same thing for the last

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one.

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This time however we are going to call a method in here in our terror the view controller but we we're

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going to call it from main view controller.

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So there has to be a connector.

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Now the moment you have something in here in your any of your view controllers that has a UI as storyboards

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segue into it as an argument it means you can call them gear in the exit.

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So in the exits I could actually go ahead and say and go back home.

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This is the function we have received as a presenting segue from another view controller looking here.

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If I actually go ahead and I Carmens this out I.

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Common doors out.

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And then the moment I go back to my storyboard Now these control these exit outlets they have nothing

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on them so no matter how much you try to control and drive over them they won't show anything to you

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simply because they don't have anything but the moment you have a back in any of your of your controllers.

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They even appear in that outlet.

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So in here in the story we're now I can go ahead and say this one.

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I want to be on this guy as an action for it.

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So now they're connected to each other.

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Let's see how they work.

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If all goes well we should be able to go from our Obviously code dive into the green one and then thrist

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this one to go back all the way to the white one to get rid of the entire stack and go back and does

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what we call an on line the same way.

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So that's about that.

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We now saw how we could drill down inside multiple layers of view controllers using segues that they

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do have identifiers and that we can actually make a lot of different kinds of applications.

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The one thing we haven't done and that's the thing I'm going to leave for the next Listen daddy is sending

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a message to segues to the next view controller semi-human I press on this one I go to the page I want

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to see something here.

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So with that in mind let's move on to our next lesson.