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Right, so let's discuss exactly what all these files are and folders, first of all, we can ignore



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these products folder.



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Just leave that alone for now.



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What we're interested in is this screen torch folder, which is the name of our application.



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The very first thing that we need to know about is this file called the app delegate.



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And if you go ahead and click that, then you'll see we get a bunch of code, a bunch of functions inside



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of a class called App Delegate.



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Don't worry about what these things are, but basically this is how the system communicates with your



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application.



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So, for example, if your application is about to be backgrounded or about to be killed by the system



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because it's consuming too many resources, then app delegate will be informed.



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Now, there's a bit more to it than that.



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But that's the basic idea of an app delegate.



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The app delegate also connects.



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Let's say you want to play music.



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It connects out to the system so the system knows which music you want to play.



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It can hand over the playback and job done.



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That's one thing I love about programming for iOS as opposed to Android.



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There are little things like that, like here's a track, just go ahead and play it that it just takes



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all the load off your hands and iOS just does the work for you.



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It just works.



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It's true.



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Well, it just works is our famous last words, aren't they.



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It doesn't always just work.



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Right.



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So that's the app delegate.



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Now we have the scene at Delegate and because this has the word delegate in it, this takes care of



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all the communication between what's happening in your scene, i.e. on the screen and this system and



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the app delegate.



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So that's basically what this does.



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And if you look at the names of these functions, we have a scene did disconnect or a scene became active,



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i.e. it was shown or a scene will resign active.



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So they're very specialized.



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What we call hooks in this, the hooks allow us to be notified when these particular things happen.



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So, for example, if you've got a little game and it's going backgrounded, you might want to save



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the player data and pause the game.



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And this is kind of where you would do that, right?



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So that's gone over to one side.



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That's basically how we're communicating with the system.



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Now, the view controller controls the view, right?



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It inherits.



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If you've taken my basic shift course, which I hope you have from the UI view controller, user interface



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view controller, this is in charge of controlling the view and nothing else.



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But but people often put a lot of code in The View controller, myself included.



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And for the purposes of teaching you how to code on iOS, I kind of have to.



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Otherwise, things get very convoluted, very fast.



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So just bear in mind, if you're taking a beginner course, such as this first part, then what you



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see is correct code, but it may be in the wrong place.



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It's not quite refracted into the correct locations.



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If you want to see that kind of thing, then search for I am Dev, build it be you I ldi it all.



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One word in those particular courses.



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I go through every app step by step without preplanning it so you can get a real feel for how we structure



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code.



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So that's the view controller if you controller controls in this case the main storyboard.



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So this at the moment is a blank screen.



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But if I click the blank screen, we get this little pop up at the side here and I'm sorry these things



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are so tiny, but Apple, with all of their accessibility rules for apps, will not give you accessibility



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in X code.



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So I can't increase the font of these.



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The only fonts I can increase are over on the far left hand side and the main font for code.



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Would you believe it?



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I mean, it really missed the target sometimes anyway.



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That's how storyboard.



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So that's the main screen controlled by the View controller.



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Then we have this little folder called Assets Dot XY assets.



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This is where will store images, icons and things like that, which we're not touching right now.



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We have another storyboard, a launch screen storyboard, and as you'd imagine, this is what shows



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when the user launches your app.



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And finally, we have an info dot, please look at that tiny, tiny, tiny font.



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I can't even zoom in.



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And out of it is TrackMan plus at.



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Anyway, these allow you to select it's basically a dictionary of preferences and things like that that



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apply to your app.



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So we have like a bundle name, we have a bundle version.



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This is all the stuff that the App Store needs to pick up in order to update your app.



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When you update your app to show the end user what version this is and various other bits and pieces



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like that.



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So basically, it's a bunch of properties.



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We also have some things down here related to the display.



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So Interface Orientation's is this a landscape or a portrait app?



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How many of those portraits and landscapes can we use?



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Can we turn the item upside down?



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All defined pretty much here.



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So those are the basic files.



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Now, most of your work is going to be done in The View controller.



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You will do some in the scene delegate, and very rarely you'll do some in the ALP delegate, most has



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done an interview controller.



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There is one view controller per screen, right?



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We never, ever want to have sort of a view controller that controls two screens because you're going



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to get a lot of crosswise and you don't want that.



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So that's your little tour around a basic east project.



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Let's move on.