MeViewController and SuperClass Part 6

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From the course by University of California, Irvine

Toward the Future of iOS Development with Swift

71 ratings

University of California, Irvine

Toward the Future of iOS Development with Swift

71 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

MeViewController and SuperClass Part 96:17

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

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All right so

now we're finished implementing our HoBshareViewController for the time being.

Let's move on to the next part which is to flesh out the MeViewController.

So once we have completed doing that we'll be almost ready to go and

hit the button to create a new user.

So let's get through this class.

We're inside of MeViewController, let's start off inside of viewDidLoad.

Now when viewDidLoad is a good time

to go do anything like set the delegates of any objects that we need to do.

We have the username text field, inside of our storyboard and

we want to make it so that when the user hits the return button

inside of the keyboard, then we go and we do something.

In this case we're going to make the keyboard go away and

we're going to go make the call to create our user or

sign in if we use an existing user name.

So, we could set the delegate of the text field in the story board.

I found that when you're working in teams and working with source control programs

like Git, SVN, or things like this, storyboards are a little bit

susceptible to getting accidentally changed when we don't mean them to.

So things like delegates are important because they're required to make sure that

the text field in this case can respond the events happening,

like the Enter button being pressed.

So if the delegate gets unset in the storyboard accidentally somehow,

then that functionality just stops working all of a sudden.

And it can be a little bit of a funky bug to track down.

So, I've gotten in the habit of doing those type of things in code.

So, we'll just say username.delegate = self.

Now we're going to get a complaint and

that's because this class does not conform to

the UITextFiield delegate, as the error here says.

So we just need to come up here to our class declaration and

say we conform to UITextField delegate, and that error will go away.

All right, next we

want to respond to the location manager getting an update on our current location.

So, we can set the latitude and longitude in our UI here on the MeViewController.

All right, so let's do that.

When we create a user also, we can optionally pass in our latitude and

longitude so the user gets created with a location.

And this allows you to be seen on the map

by others as soon as you select some hobbies for yourself.

If we didn't do this or if that's handled by us on the server.

If you don't pass in your latitude and longitude, or

if you don't have permission to get your lat long.

Or if the core location framework somehow just failed to get your lat long and

you can't send the lat long in, we'll still create the user for you but

no one will be able to see you.

No other user will be able to see you,

on the map until you actually go look for other users on the map.

That is another place on the server side that

we have made sure that your location will be updated in the data base.

All right, so let's now go and override the location manager's delegate so

we can update our lat and long labels in our UI.

So here we say override function of the locationManager didUpdateLocations.

And it's complaining because this class doesn't import MapKit.

So it can't recognize what CL location manager is.

It says he's an undeclared type, CL location manager.

So we'll come up here and we'll say import MapKit.

And that error should go away.

Now all we do is we want to make sure that we call super's implementation,

which we wrote.

because our super, again, is HobbyshareViewController, which we made.

We want to make sure it calls super's implementation so

that we get its behavior, which sets the currentLocation property for us.

So if we go quickly take a peek at that,

which I can do by hitting CMD+clicking that function,

it'll take me to the declaration, take me to the definition of that function.

Then we can see when we get an update on our location then we set

our current location.

Okay, now that we have our current location, we can say

latitudelabel.text equals, the string, latitude,

plus space so that it looks nice, easy readable english.

And then we use string interpolation to say current

location.coordinate.latitude and same thing for longitude.

All right, so now we have listened to the locationManager's updates

inside of the MeViewController so that we can update the MeViewController's UI.

[MUSIC]

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