[MUSIC]

[SOUND] Our app is feature complete and we've learned a lot of new things so far.

We learned how to create an app with multiple views,

which included learning about a navigation controller and its navigation stack.

We also learned about creating a complex tree-like model how to inject data into

a view controller how to create and layout views programatically and much more.

These are all foundational topics but now let's have a bit of fun.

The story in our app is always the same regardless of who uses the app.

So let's try and give it a bit of a personal feel.

Let's modifying the app to allow the user to

enter their name before they start the adventure.

Once we navigate through the story will display their name in a few places to make

it feel more personal.

So the first thing we're going to do is head over

to the story.swift file to the story enum.

We're only going to modify our story in minor ways.

Since our model is an enum and each segment of the story is an enum member,

let's give three enum members, just for the sake of example,

we'll give three enum members associated values.

So let's add an associated value of a string to return trip.

So this is going to be an associative value of type string and

will give this argument a name of name.

We'll do the same thing with rover name of type string and with droid.

So again name type string.

We'll pass in the user's name as an associative value to use in our story.

So in the text computed property which should be down here.

Let's bind the associated value to a local constant.

For example we can change case.returnTrip to case.returnTrip (let name).

And now we can use this name to modify the text for this in a member.

So right here where it says help me, you're my only hope,

we can do something like help me.

And then we'll insert the name.

You're my only hope.

Similarly let's add a change to the rover text property right here.

So again we'll bind the name to a local constant and

we'll say there's a message on the screen, and so

it's just saying come we'll say name coma, come to these coordinates.

Finally let's make the same change to the droid member which is the second last one.

Again, we want to bind the name and we'll change the droids name in

the story since the Droid S1124 will now say name S1124,

with these changes we're going to have an error and

that's because we need to make a change to our wrapper struct adventure.

So let's head over to Page.swift.

And in the adventure struct, since two enum members require associated values

now, we need to provide them when creating our story.

Instead of hard coding a name in our story, let's change this from a static

computed property to a static method that takes a parameter.

So instead of static var story, we'll say static func story(withName

name: type String).

And this has a return value of page.

So now the body of the method should stay more or

less the same except, we need to add the associated value in the right places.

So returnTrip takes a name, and we're going to pass through the argument that we

provide in the function, which is name.

And we'll do the same thing down here for rover.

So name, oops.

Rover, and in parentheses, name name.

And finally for droid.

And that is right down here.

And that should clear all our errors out.

Okay, much better.