Jonathan Cusick

On Saturday February 6th the first Super Happy Dev Castle (SHDC) took place in Northern Ireland. Super Happy Dev House (SHDH) started as a hackathon event for developers and anyone interested in development, technology and geekery in a relaxed and extremely motivating environment.

You may be wondering why this event was called SHDC and not SHDH, the reason for this is because the first event was hosted by Blaine Cook who not only happens to be an extremely nice person and world renowned developer but also happens to live in a castle. In addition to Blaine hosting the event, two local developers David Wilson and Steven Holdsworth were organising it and deserve a pat on the back for making the event a success.

The criteria for the day was to bring along a laptop, beer, Unix books and big smiles! This was clearly not an issue as there was a great turn out (around 30 people) all working on exciting and state of the art projects.

A fantastic Spotify playlist and IRC room were quickly implemented at the start of the event and proved to be popular as they lasted for the duration, and I am still listening to the playlist in work this week.

Working in this environment proved to be an interesting experience, as new creative ideas where constantly being discussed and analysed, in addition to many laughs and what can only be described as one or two moments of madness (probably due to the beer)!

Many thanks to Blaine and Maureen for being such great hosts and keeping us topped up with great pizza and amazing coffee.

Some of the guys hacking code at SHDC

When developing an application for the iPhone you will have to register for the iPhone development program ($99 for non-enterprise developers) in order for your applications to be published on the app store or to test them locally on your own device.

Once you have registered for the iPhone development program you can follow these steps in order create your own provisioning profile, developer certificate and test applications on your device:

Development Provisioning Assistant

In order to launch the iPhone Development Provisioning Assistant you will first have to log in to the iPhone developer site . Once logged in you will have to select the option ‘iPhone Developer Program Portal’ and then simply click the ‘Launch Assistant’ icon.

From here simply follow the assistant prompts and provide the following information:

Application ID – To start the configuration all you have to do is to enter an App ID which is used to validate your applications access to the Keychain.

Assign Device – In order to assign a device you will be required to enter two pieces of information a device description and a device ID.

To establish what your device ID is, you will have to connect your device to your Mac, then select ‘Window -> Organizer’ within Xcode and this will provide you with the identifier for the device you have connected.

Development Certificate – At this stage a development certificate has to be submitted, this certificate is used to enable apps to run on the device for testing. In order to create a certificate you will have to use the ‘Keychain Access’ application which can be found under the utilities folder on your Mac.

Using the Keychain Access application now select ‘Keychain Access -> Certificate Assistant -> Request a Certificate From A Certificate Authority…’

Now all you have to do is ensure the information here is correct and save it to disk, you can then submit this certificate by going back to the provisioning assistant.

Profile Name – As the App ID, Device description and Certificate have been established you now just have to enter a profile name/description in the field provided within the provisioning assistant.

Provisioning Profile Download And Install – On the provisioning profile download and install screen, you simply have to click download in order to obtain your development profile. Now to install the profile ensure that your device is connected, that Xcode is open and then drag the profile into the ‘Organizer’ window. This is all that is required to install the profile, now head back to the provisioning assistant.

Development Certificate Download And Install – On the development certificate download and install screen, click download just like before to download the certificate. To install the development certificate is extremely easy all you have to do is double-click it and the Keychain Access application will open to confirm you want to install it, at this prompt click ‘OK’.

Get An App On Your Device – Now that you have configured your development certificate and provisioning profile, all you have to do is ensure that your device is connected to your Mac and go back into Xcode. Next open a project you have been working on, but this time before you click ‘Build and Run’ look at the top left hand side of the screen, click on the ‘Overview’ drop down list and select ‘iPhone Device 3.X.X (Base SDK). Now when you click ‘Build and Run’ your app will be installed on the device, and you will be able to properly test it. To remove the app you can do this as normal by tapping and holding the icon until it shakes and finally hit the ‘X’ to remove it.

I have been thinking about some New Year’s resolutions for 2010 so I have composed the following list.

1. Learn to use my Canon 450D properly

2. Finish my iPhone apps and get them in the app store

3. Attend SXSW in March (flights and platinum badge already purchased)

4. Attend WWDC in June

5. Experiment with more software development design patterns

6. Get digitalrobotsoftware.com up and running

7. Produce better quality blog posts

8. Develop a desktop application for OS X

9. Run more often

10. In 2009 I have met a lot of great people so I aim to meet lots more in 2010

As New Year’s resolutions are notorious for not being maintained, I have made this list realistic and by the time we reach 2011 hopefully these goals will have been achieved.

This is my first photo of 2010 – one of my goals this year is to learn how to use my camera properly.

The final addition to the winter trees collection.

More photos of the winter trees I snapped this afternoon.

There was still a lot of snow around today and the trees were looking rather spectacular so I had to take a few photos.

We had around 5″ of snow fall today. Enjoy the photos!

Continuing my photography experiments, it really is amazing the difference that flash can make.

Flash

No Flash

If you are planning on developing applications for the iPhone chances are you will be familiar with object oriented programming. Design patterns promote code and design reuse along with making an entire application easier to understand and why a certain structure was adopted.

It is important to note that a design pattern is not a blueprint for an application that just has to be written in your development language of choice, but rather a blueprint for how to implement your code in order to enable stronger code maintainability, testing and to avoid a wide range of issues that could otherwise occur with unstructured (spaghetti) code.

The iPhone platform makes use of the Model View Controller (MVC) design pattern.

Model – Manages the data for the application and how the state of the data should be updated.

View – Will handle how the data is displayed on the screen.

Controller – Deals with the inputs from the user such as utilising all the available on screen elements such as buttons and keyboard functions.

With the MVC design pattern it means that when developing for the iPhone you will have a better way of maintaining and testing your applications. Overall this should mean that better quality applications are created.

On a side note I used Balsamiq Mockups to create the above diagram, I would highly recommend giving it a try. This has quickly become one of my favourite applications.

Updated: Diagram updated to show two way relationship between model and view (well spotted by David Rice)