Function with Parameters Part 2

Loading...

Del curso dictado por University of California, Irvine

Toward the Future of iOS Development with Swift

74 calificaciones

University of California, Irvine

Toward the Future of iOS Development with Swift

74 calificaciones

Curso 5 de 6 en SpecializationiOS Development for Creative Entrepreneurs

An introduction to the Swift programming language. This will prepare you for more extensive iOS app development and build a foundation for advanced iOS development topics. Upon completing this course, you will be able to: 1. Associate the relationship of Swift and Objective-C and their use in iOS and Mac (OS X) programming 2. Develop the ability to read and write Swift code 3. Distinguish how both programming languages can be used together in applications 4. Demonstrate how to write applications entirely in Swift with the help from several iOS programming samples 5. Determine how Swift can be used for development on new platforms such as Apple Watch and Apple TV 6. Create a working client-server iPhone application with location services that you can add to your portfolio.

De la lección

Introduction to Swift

In this first week, you will get a first look at the programming environment and the Swift programming language. If you have taken the “Foundations of Objective-C App Development” Course in this Specialization, some of this content may be familiar. Students who have not taken that course - no need to worry - you will receive a full introduction to become familiar with programming for iOS or Mac OS X as if Swift is your first programming language.

How to Create a Basic Function7:44

Function with Parameters Part 19:48

Function with Parameters Part 25:49

Function with Parameters Part 38:05

Functions that Return a Value(s) Part 16:23

Functions that Return a Value(s) Part 210:49

Scope / Improper Conditions7:17

A Word on Function Types2:08

Conoce a los instructores

Justin-Nicholas Toyama
UCI Extension Instructor
Lead iOS Developer at Smilefish Corporation
Frank Ayars
UCI Extension Instructor
CTO and Director of Software Development at Smilefish Corporation
Ralf Brockhaus
UCI Extension Instructor
Founder and CEO at Smilefish Corporation

[MUSIC]

>> Let's take a look now at a function that takes multiple arguments.

This will allow us to show more or less information about a planet, right?

That's what we're making it do here.

And notice the type of the argument planet is the same as before.

We just typed it a little bit different,

with the keyboard, typed it out differently, okay?

So, here we have Show Info.

And instead of calling this argument planet, it's little bit tedious inside of

our function to keep typing planet over and over again.

So I'm just going to call this argument p, and that stands for planet.

All right. It's of the same type in dictionary that

takes the string for keys and any object for the values, right?

Notice here, we use the dictionary literal syntax versus, in the previous one,

we used this other syntax with the angle brackets.

All right.

And now, our two other arguments for this function,

showsNumberofMoons, of type Bool.

So showsNumberofMoons will be True or false.

And showsMoonNames also of type Bool will be true or false.

So this will let us control how much information we see about the planet.

All right So, this is very similar logic to the example I just showed you.

So I won't explain all of the logic in here.

I'll just explain what's unique.

So we have an if case here that says if shows number of moons equals true.

So we can access

the values that are passed into our functions through these arguments

by using the name of the argument as we do with any other variable name.

So, when I call this function, so for example,

showInfoAboutMars, showsNumberOfMoons, and I set that to true here when I call it.

So that will be passed into this argument showsNumberOfMoons will be equal to true.

And down here when I use showsNumberOfMoons,

then I can compare with the value that was passed into our function.

So if showsMoons equals true,

then do all of the logic that we just

saw to make the info string, right?

We don't call it info string here, but show the final string.

The planet so-and-so has x number of moons.

Or if it's only one moon, the planet so-and-so has one moon, right?

With no s at the end.

So that's a nice English sentence.

Okay? So, otherwise,

we don't have an else case here because if showsNumberOfMoons equals false,

we just don't have to do anything, and of course, we won't see that information.

Same here with showsMoonNames.

We say ifShowsMoonNames equals true, then we can call the function that we made

in the previous example just a few minutes ago, called showMoonsOfPlanet.

And notice here that we're passing in the planet that this function contains,

or excuse me, that this function received into another function.

So let's look at that quickly.

Here, I have my function showInfoAboutPlanet.

We're calling it p right now.

And this is going to be passed into this function by the caller.

And now this function is actually the caller of the showMoonsOfPlanet function.

We can pass in ourPlanet by just putting in p for the argument,

the planet argument, of showMoonsOfPlanet.

Okay.

So, now that we have our functions set up to show the moon names and

show the number of the moons or not, then we can call this function.

So, showInfo.

We're going to pass in the planet Mars.

ShowsNumberOfMoons equals true, and showsMoonNames equals true.

And we should see all that information.

So, Here we go.

Here's the information you asked for about the planet Mars.

No information available for the names of the moons of planet Mars.

Here's the information you asked for about planet Gaia.

In the next line of code we pass in Earth, and we say showNumbrOfMoons equals false.

And showNamesOfMoons equals true.

So, the only moon of planet Gaia is called Luna.

And I can pass in true for showsNumberOfMoons, and

we should see that change in our console at the bottom.

All right.

So, we let our playground execute.

Take a little bit of time, but we changed showsNumberOfMoons from false to true.

And now we see here's the information we asked for.

The planet Gaia has one moon, and the only moon of planet Gaia is called Luna.

So the function performed as we expected it to.

[MUSIC]

Explora nuestro catálogo

Inscríbete de manera gratuita y obtén recomendaciones personalizadas, actualizaciones y ofertas.

Coursera brinda acceso universal a la mejor educación del mundo, al asociarse con las mejores universidades y organizaciones, para ofrecer cursos en línea.

© 2019 Coursera Inc. Todos los derechos reservados.

Descargar en la App Store

Consíguelo en Google Play