The new look of iPhone OS 4 includes a 3D dock, and a customizable wallpaper.

Apple illustrates the major updates of iPhone OS 4 into “tent poles” which are described in the next section.

1. Multi-tasking

This is perhaps the biggest update to iPhone OS 4. Make no mistake, the iPhone already supports multi-tasking on some of its native applications like Mail and iPod. However, it has closed this door to third-party applications because allowing them to run in the background affects the phone’s battery life and performance.

The big question to ask is: how does iPhone OS 4 support multi-tasking without affecting performance?

Rather than allowing applications to run freely in the background, Apple’s approach is to provide a la carte multi-tasking services. This ensures that an application will only use the multi-tasking function it needs without adulterating the performance of the entire device.

The multi-tasking services that are offered for iPhone OS 4 include:

• Background Audio - this service will allow applications like Pandora, and Ambience to play audio on the background.
• Voice Over IP - this service will allow applications like Skype, and Fring to receive VoIP calls even when the application is not running.
• Background Location - this service will allow applications like Loopt and FourSquare to constantly update user location even when the application is not running. Instead of polling GPS data, this service will use triangulation to retrieve location.
• Local Notifications - this service will allow productivity applications such as to-do lists and calendars to send notifications to the phone without having to use Apple’s Push Notification Service (PNS).
• Task Finishing - this service will allow tasks that take a while to load (like uploading a picture on Facebook) to run in the background even when the application is not active.
• Fast App Switching – this service will allow an application to save its entire state (i.e. state of a chess game) to enable users to swiftly change between applications without any delay.

With the iPhone OS 4 sporting new multi-tasking capabilities, there is a lot of creative potential for forthcoming applications.

With Multi-tasking, users can switch between apps at anytime by double-clicking the home button. Running apps can be killed by tapping and holding the app icon.

2. Enterprise

Enterprises have long had rancorous feelings about supporting the iPhone. In iPhone OS 3, the iPhone had spotty support for key enterprise features that were critical to enterprise adoption.

The release of iPhone OS 4 provides some important updates that might entice Enterprise decision-makers to take a second look at the iPhone. These new features include:

• Data Protection
• Wireless App Distribution
• Improved Mail
• Mobile Device Management
• SSL VPN Support

Other major features of iPhone OS 4 include:

3. Folders

Scrolling through multiple pages before finding that favorite application? Android users don’t have a problem with this. However, with iPhone OS 4, applications can be organized and grouped into folders. Dragging the application on top of another application automatically creates a folder, reducing clutter. This also increases the current limit of 180 applications to 2160.

With Folders, apps can be organized to reduce clutter and improve usability.

4. Even Better Mail

With iPhone OS 4, the Mail application now supports a unified inbox. It also includes support for viewing messages as threads, and opening attachments using third party applications.

5. iBooks

Apple’s e-reader application that comes pre-installed on the iPad will be available to iPhone users with the update of iPhone OS 4. Similar to Amazon’s Kindle e-reader, a massive library of books can be purchased and downloaded straight from the iBooks application.

6. Game Center

With Apple’s successful business model for game development and distribution, is not surprising why Nintendo calls them “the enemy of the future”. In a move to aggrandize its market share, Apple is providing a new social platform for its avid gamers by introducing Game Center on iPhone OS 4. With Game Center, users can play multiplayer games, view ranks, and chat with their favorite buddies similar to Xbox Live.

Game Center provides a social platform for avid iPhone / iPod touch gamers similar to Xbox Live.

7. iAd

iAd is Apple’s new mobile advertising platform to help developers with revenue generation. Current ads found in most free iPhone applications resemble that of classic web banners where users are taken to an external website when clicked.  With iAds, apps can feature highly interactive ads that combine the emotion of TV with the interactivity of the web. Think of these ads as “micro-apps”, or an app within an app.

To wrap it up…

iPhone OS 4 is a major update for the OS. The addition of multi-tasking capabilities, coupled with several improvements in the user experience puts the OS ahead of its competition. Apple claims to have the best implementation of multi-tasking among its competitors. Their name will be put to the test come June.

To learn more about the upcoming iPhone OS 4.0, visit the Apple website or watch the Keynote address . If you are an official iPhone Developer, you can download a beta version of iPhone OS 4 from the developer portal.

Apple has announced a surprise event on April 8th to reveal details on the much anticipated iPhone OS 4.0.  This event should spill the beans on multi-tasking support and other new features. Im curious to see what’s in store for the future of iPhone OS…

“If I could do anything, I would…”

• Create technology that would change people’s lives
• Build a beautiful house for every family in the world
• Eliminate poverty, eliminate diseases, and get rid of pornography
• Provide everybody in the world the chance to fulfill their dreams
• Create a bridge from Michigan to Cebu, or perhaps a tunnel or a teleport machine…
• Have YFC/SFC household on the moon
• Learn the ability to walk on water so I can run around the world..
• Travel the solar system within 3 days, starting from the Sun, with a pit-stop at the rings of Saturn, and finally surfing around the outskirts of the milky way. Then I would fly back to Earth, rest for a few days, and Start making plans to travel to a different universe..
• Allow snow to fall in the Philippines (for a few days the most) so people there can finally experience their first snow
• Swim with a blue whale as he takes me around to the wonders of the ocean
• Travel the world with my wife
• If I could do anything, I would still read books, go to Grad school, and be able to learn and explore the fascinating world around us..
• If I could do anything, I would… Do more…

If you could do anything, what would you do?

In its simplest form, Benford’s Law says that there is a distinctive pattern on the “population” of numbers. If you gather all the numbers in the world (from numbers found in stock prices, to newspapers, height of buildings, temperatures, cash registers, etc.), approximately 30% of them start with # 1. Let me repeat that, about 30% of numbers in the world start with #1.

But wait there’s more!

About 18% of all numbers in the world begin with #2. About 13% begin with #3. See the pattern?

And here’s the entire gamut:

• #4:  9.7%
• #5:  7.9%
• #6:  6.7%
• #7:  5.8%
• #8:  5.1%
• #9:  4.6%

Visualizing this pattern, we get:

So what’s so significant about Benford’s Law? Surprisingly, the natural distribution of numbers is so universal that it can be applied to any numerical context (i.e. finance reports, random numbers). Any deviation from this pattern denotes that the numbers have been manually modified. In fact, Benford’s Law has been used to detect accounting fraud and other related crimes (see example below).

Lesson: don’t mess with numbers (unless you follow Benford’s Law).

UPDATE: Results are in. MIT Red Balloon Team has won the competition. Great effort! I’m curious to know how teams approached this problem.

If you have seen one, please let me (or our team) know!

This Saturday (December 5), DARPA, The Defense Advanced Research Projects Agency, will release 10 red balloons at fixed locations. The challenge is to FIND THEM. The first individual or group to locate all 10 balloons will receive a $40,000 cash prize. This task may be harder than it seems so we need a lot of help!

Join our team. Click here to join our Facebook group.

Pass it along! Tell your friends, your girlfriends, your girlfriends’ girlfriends, and your girlfriends’ girlfriends’ grandparents!

More information on the DARPA Network Challenge

The most straightforward method for dealing with .plist files is +[NSArray initWithContentsOfFile:path]. However, you need to specify the correct path of the plist file via [NSBundle pathForResource:plist ofType:].

Code block

- (NSArray *)arrayFromPlist: (NSString *)plist {
     NSString *path = [[NSBundle mainBundle] pathForResource:plist ofType:@"plist"];
     NSArray *array = [[NSArray alloc] initWithContentsOfFile:path];
     return array;
 }

Loading to a Dictionary

To load the contents of a .plist file to a dictionary,  instantiate a NSDictionary or NSMutableDictionary and initialize it with [NSDictionary initWithContentsOfFile:]

Code block

- (NSDictionary *)dictionaryFromPlist: (NSString *)plist {
 NSString *path = [[NSBundle mainBundle] pathForResource:plist ofType:@"plist"];
 NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
 return dict;
}

Writing to a .plist

The easiest way to write values to a .plist file is to use a NSDictionary and modify its contents using -[NSDictionary setObject: forKey:]. To save the contents to a .plist file, use -[NSDictionary writeToFile: atomically:].

Atomically writing to a file guarantees that the file, if it exists at all, does not become corrupted even when the system should crash while writing.

Code block

NSString *path = @"Path to Plist.plist";
 NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
[dict setObject:@"Gierad" forKey:@"name"];
[dict writeToFile:path atomically:YES];

Lastly, if you want to read/write small configurations for your app, NSUserDefaults is recommended. It contains methods to easily handle key-value pairs including floats and other objects.

]]> http://www.gierad.com/blog/2009/11/28/iphone-sdk-dealing-with-plist-files/feed/ 0 http://www.gierad.com/blog/2009/11/21/new-domain-name/ http://www.gierad.com/blog/2009/11/21/new-domain-name/#comments Sat, 21 Nov 2009 09:40:42 +0000 gierad http://www.gierad.com/blog/?p=13 I am proud to announce that gierad.com has been successfully registered! I am planning to move all my old stuff from digitalvent.com to gierad.com.

I am still planning to keep digitalvent.com, but I hope to slowly transition to using my new domain name.

I am also setting up email accounts for gierad.com to use Gmail. At the moment of writing, Gmail is waiting for the MX records to fully propagate across the Internet (which could take up to 48 hours).

I will post updates when they come.

Update: Companies that are part of the BlackBerry Trial Premier Support can obtain signing keys for free. Contact your BlackBerry Account Manager for more details.

You create apps for the BlackBerry and it runs perfect on the simulator. Now you want to deploy it on an actual device. It may sound easy, but if your app is using specific BlackBerry API’s, your program will not function if they are not code-signed. You need to sign-up for API keys from RIM.

So you want to run your app on a BlackBerry device? Start reading!

Basically, you need to do three things:

1. First, you need to fill out the BlackBerry signing keys request form. You can fill out the form here. There is a $25 fee for requesting signing keys. During registration, you will be asked for a security PIN. REMEMBER THIS PIN!
2. Once the form is complete, you will get an email from RIM with attachments (.csi) within 48 hours to 10 business days. You will get three keys in three separate emails.
3. Finally, install the keys on your machine by running the BlackBerry SignatureTool. This program is located under the BlackBerry JDE installation directory. To run SignatureTool, use the command prompt and type the following:

   java -jar <BB JDE Dir>\SignatureTool.jar <.csi file>

   This will take you to the SignatureTool registration wizard. The wizard will ask you for the registration PIN mentioned in Step 1. It will also ask you for a personal password. Make sure to remember this personal password since you will be asked for it whenever you compile you BlackBerry app.

That’s it! The steps might be a bit intimidating at first, but its very straightforward. I still honestly think that RIM should streamline the key signing process similar to the iPhone Developer Program.

Additionally, you may also want to read this article from Chris Crowe.