MeViewController and SuperClass Part 9

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From the course by University of California, Irvine

Toward the Future of iOS Development with Swift

74 ratings

University of California, Irvine

Toward the Future of iOS Development with Swift

74 ratings

Course 5 of 6 in the Specialization iOS 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.

From the lesson

iPhone Applications and More

In this last week of the course, you will follow along and create a more full-fledged application called HoBshare. This is a more complex application that is intended to help you use many of the different techniques and language features introduced in the previous weeks and see how they can be used as tools to develop an application. We will also explore some of the new and exciting consumer technologies that developers can now work with using Swift.

MeViewController and SuperClass Part 18:04

MeViewController and SuperClass Part 26:17

MeViewController and SuperClass Part 311:15

MeViewController and SuperClass Part 415:21

MeViewController and SuperClass Part 57:34

MeViewController and SuperClass Part 66:15

MeViewController and SuperClass Part 78:36

MeViewController and SuperClass Part 86:16

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MeViewController and SuperClass Part 1011:42

Meet the Instructors

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]

I'll come over here, and I'll say this new function,

which we'll implement in a second.

Self dot save hobbies to user defaults.

User defaults, and it's user defaults kind of works like a dictionary that lives in

the file system on your phone.

So it's not im memory.

it's written quote on quote two disc.

The flash storage of your phone or simulator, right?

So whenever we update my hobbies, we'll save those hobbies

to our user defaults let's go and implement that function

So we'll put that at the bottom here.

By the way in Swift, the order of

where your functions are in your actual code source file doesn't matter anymore.

So in other program languages, before we call a function inside of.

Another function perhaps, we have to put the definition for

that function physically above that line of code.

So if that's not the case, you're more free to choose how your code is organized.

All right so, inside of our save hobbies, c is our default function.

We're going to take our array of hobbies, my hobbies.

And we're going to save that into data,

meaning NS data, and we'll do that with this,

with this keyed NS keyed art class.

All right.

Now in order for that work we have to make the hobby class

conform to the NS coding protocols, so that we can take the properties in the And

the hobby, and turn them into data.

And then, we can also be able to take the data and turn it back into a hobby.

We'll look at that in a little while, when we finish implementing the models and

data providers, but let's continue for now.

Once we've saved that array of my hobbies into data,

which we're calling hobby data, here.

Then we can save that data to the disc.

And, we'll do that again using NSN user defaults.

So, we'll say userdefaults.standarduserdefaults

.setValue our hobbyData for the key MyHobbies.

We can't just put the MyHobbies erase straight into in its user defaults because

the type of MyHobbies is an array of that except type Hobby.

For in its user defaults you have to use what are called p-list objects

which means it has to be, and NS something, something object.

Some NS objects have class like NSArray, NSDictionary, NSString,

NSNumber, ect, ect.

So changing it to NSData satisfies that requirement for us which is why we go

through the step of turning our hobby array into a type of data.

All right.

So now, we can save it into that key, and

then we want to make sure that it actually saves it to disk.

So we need to call this line here,

NSUserDefaults.standardUserDefaults().syn- chronize.

If you don't call synchronize, the next time that you

start your application t his data will no longer be inside of the key MyHobbies.

So make sure to actually erase it to the disk by calling

this only works if ns user defaults knows there's a key called my hobbies

in which to save this hobby data value.

So we need to register Register the MyHobbies key.

And a good place to do registration of NS user defaults keys is

inside of your app delegate's application didFinishLaunchingWithOptions function.

So let's go do that.

All right, so

here we are in app delegate and we're going to go register that MyHobbies key.

But we only want to do that if there's nothing in the my hobbies care already,

because we don't want to bother overwriting.

Or we don't want to overwrite, any data that we saved over there on purpose.

So I'll say if, and it's user defaults.stan.

Then I want to say NSUSERDefaults.StandardUserDefaults,

register defaults, my hobbies, and I need to provide some value for that, some

initial value for that hobbies key which is why you see hobby data again here.

So I'm just going to create a fictitious array of myHobbies that will be

the default for a new user, let's say.

Again, we haven't implemented the hobbyName initializer function yet.

We'll do that in the next lesson when we Work on the model

class so we'll let this error just stand here for now.

But we've created an array of hobby's using that custom initializer which we'll

array and then we do the same thing.

We save it into data and now we can see that hobby data as the initial data for

the my hobbies key.

And again we must call synchronized to save that initial

default value into its users defaults.

[MUSIC]

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