Name: 斯坦福--用Swift開發iOS 10應用--1.介紹iOS 10、Xcode 8和Swift 3。 (Stanford - Developing iOS 10 Apps with Swift - 1. Introduction to iOS 10, Xcode 8 and Swift 3)
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Okay, well, welcome to CS193P,   Stanford CS193P.

This is Developing               Applications for iOS, winter

of 2017. Today we're going to    talk a little bit about what

this class is about, and         the prerequisites you need.

Then I'm, really fast, gonna     go over iOS and what's in it.

And then, I'm gonna dive         into a big, long demo.

And this demo is gonna really    quickly let you see what it's

like to develop an application   for iOS, so you can decide,

is this for me, or not?          So, what are you gonna learn?

Well you're gonna learn to       build cool apps, all right,

that's, that's what we're here   for. Why are these apps in iOS

cool? Well for                   a number of reasons, okay?

One is they're in                your back pocket,

you can pull them out and show   your friends on your phone,

a lot of them are networked so   there're kind of social

apps and a lot of that           can be a lot of fun.

Also if you decide to turn       your app into a product it's

really easy to get it out to     customers via the app store.

You don't have to                wrap it in a box and

put it on a shelf somewhere      anymore. You can get it out

there real quick.                And also you're going to see,

today even, it's really easy     to build pretty complex

app pretty quickly. So you get   a lot of instant gratification

from building iOS apps.          For those of you in

computer science there's also    this huge benefit, you're

gonna get to see a real life     object-oriented programming

system. And not just             object-oriented programming,

but we're going to use           databases in this class, and

graphics, and multimedia,        multi-threading, animation,

you're going to see it in        a real world environment.

So you take a lot of             classes on these subjects

and sometimes you get maybe      a little disconnected from

what's this like in              the real world, well,

you're gonna get to see it all   in action here. Prerequisites,

just boiling it down really      easily. The prerequisite for

the class is object-oriented     programming.

You have to know                 object-oriented programming,

I'm not gonna teach that in      the class, I completely and

utterly assume it. And not       only do you have to know it,

you have to have some            experience doing it.

So that's why here at            Stanford CS106 A and

B are a hard prerequisite. You   have to have taken those two,

those are object-oriented        programming classes. And

then I just want to make sure    you have some programming

experience, so either you've     done something outside

of school, or you've taken       CS107 or CS108 or CS110.

CS108 is a particularly          great prerequisite,

that's object-oriented           programming.

So if you have a chance          to take CS108 and

you haven't taken it yet,        yeah, maybe taken it, and

then take this class the next    time it's offered, all right?

So let's dive through what's     in iOS really quickly here.

I've divided it here             into four layers.

These layers are roughly         close to the hardware.

And then up close to the user.   So that bottom layer close to

the hardware, that's actually    a Unix operating system, okay?

Just like macOS, iOS is          a Unix operating system at

the bottom. None of these        APIs are object oriented or

anything, they're basically C,   okay? For

the Unix pretty much written     in C, these API's are in C.

We're gonna do no work at that   level in this class, okay?

This is an object-oriented       programming only class,

so we're not gonna be            doing anything there.

So there's another layer right   on top of that called core

services. Sometimes people       refer to this as foundation,

but there's other things         in this lever, layer,

besides foundation. And this     is an object oriented layer

on top of those things that      were lower down. Okay, so

now you can do networking,       file system, things like that,

using object oriented API. But   this is still non UI layer,

right? It's still kinda closer   to the hardware. So I'll

definitely be teaching you       a lot of stuff at this layer,

'cause you just need it to do    the things you're gonna do.

Now, there's another layer       here, the media layer here I

call it. This is a huge layer,   which has 3D graphics, and

audio playback and recording,    image processing, video,

all that stuff. Unfortunately    I'm not gonna have a lot of

time to spend here, even         though it's a huge part of

what an iOS device does. iOS     devices all pretty much have

iPods in them, video iPods       if you wanna think about it.

And so there's a lot here.       Unfortunately I can't cover it

all. Because I'm gonna spend     most of my time up here,

which is                         the Cocoa Touch layer.

This is where buttons and text   fields and things are, but

also much more powerful          objects like maps.

There's an object in Cocoa       Touch which is a map object,

it's pretty much the entire      Maps application on

an iOS device, that you can      drop right into a rectangle

in your app.                     With almost no work.

So, very powerful object to      this layer. This is where

we're gonna spend the vast       majority of our time,

building user interface          apps at this layer.

That's a rough overview.         Trying to explain all

of iOS in two minutes is         pretty much impossible, but

that's kind of what we're        doing in this class. We're

gonna use all these components   to get our work done.

Top level there,                 Xcode 8, is gonna be...

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斯坦福--用Swift開發iOS 10應用--1.介紹iOS 10、Xcode 8和Swift 3。 (Stanford - Developing iOS 10 Apps with Swift - 1. Introduction to iOS 10, Xcode 8 and Swift 3)

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