Category | objective-c



How to create a compass in iPhone

Posted by: kiichi | Date: 10 Jan 2012 | 0 Comment | Tags: ,,,,,,, | 
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A Happy New Year! I hope everyone enjoy this winter season. I want you to remember another new year holiday, which is in Chinese calendar, coming in a few weeks. We will update our Chinese Astrology and Feng Shui App with a bunch of features, such as a compass to show direction on the screen. According to our partner, Eco-Med LLC which is Feng Shui guru company, ancient Chinese people have developed complex schema to determine the layout of rooms / furnitures depend on your "lucky" direction. In 21st century, the iPhone in your pocket contains a small device, it's called magnetrometer, helps you to solve...



Core Image Framework in IOS 5.0

Posted by: soe | Date: 31 Dec 2011 | 0 Comment | Tags: , | 
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With the new ios 5 comes new frameworks. Today we are going to investigate one of the new framework: Core Image Framework. Core Image framework contains built in image filters to manipulate images and videos. The framework includes basic image filters like Sepia tone and Monochrome to advance image operations like face detection. One of the main advantage of the Core Image Framework is it's ability to be able to use both CPU and GPU power, and the result is very fast image processing. The framework can even support the real time processing of video frames. There are 3 main components in Core Image...



Scary Camera – Our new iPhone App Released!

Posted by: ken | Date: 20 Oct 2011 | 1 Comment | Tags: ,,,,,,,,,, | 
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Get ready for a scary Halloween! Scary Camera FREE lets you take spooky photos of your family, friends and even yourself. Apply our special photo effects and scary frames in Real Time. Watch as Scary Camera transforms the world around you into a real life horror show. Show off your creativity with our special photo effects and make your own haunted photos. Scare all of your friends this Halloween! Tired of taking the same old normal pictures? Add something scary to it in Real Time. Make your pictures look like they came out of the grundge movie. Choose from over 20 different horror frames...



iAge is available for free now!

Posted by: kiichi | Date: 02 Sep 2010 | 1 Comment | Tags: ,,,,,, | 
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We just released a free version of iAge (a.k.a. EarAge) that plays stealth tone like mosquito sounds. Can you identify if it's playing or not? Try to increase the pitch by rotating the dial in the middle. Ultimate Sound Test [10000 hz - 1 hz] Download this app from here:



iPad SDK 3.2 Document Support

Posted by: kiichi | Date: 14 Jun 2010 | 11 Comments | Tags: ,,,,, | 
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In this post, we'll discuss about the new File-Sharing and Document Support features in iPhone OS 3.2. The new File-Sharing feature allows user to access /Document directory through iTunes. Users are able to move files from their computers to iPads or iPads to their computers by using this feature. The new Document Support feature allows an application to register its supportive file types to the system. This feature allows an application to redirect files to be opened in other applications. For an example: an application doesn't know how to open a PDF document. This feature allows the PDF document...



Encrypting / Decrypting / Base64 Encode / Decode in iPhone Objective-C

Posted by: kiichi | Date: 20 Apr 2010 | 14 Comments | Tags: ,,,, | 
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I went through websites to find good tricks to send encrypted data to my server. Here is encryption / decryption functions by Jeff and Base 64 functions by Cyrus Include following headers: #import "NSData-AES.h" #import "Base64.h" Implementation: NSString *password = @"mypassword"; NSString *str = @"hello world 123"; // 1) Encrypt NSLog(@"encrypting string = %@",str); NSData *data = [str dataUsingEncoding: NSASCIIStringEncoding]; NSData *encryptedData = [data AESEncryptWithPassphrase:password]; // 2) Encode Base 64 // If you need to send over internet, encode NSData...



How to add CoverFlow Effect on your iPhone App – OpenFlow

Posted by: avinash | Date: 09 Apr 2010 | 40 Comments | Tags: ,, | 
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Hello all, The main criteria of this post is to help you add a cool effect called the "cover flow/open flow" effect to any of your iphone apps. This is cool in two ways actually. One it adds animation kind of effect to your app and the other, its very easy to build too. I got to learn about this effect when I was working on my "pianos" app where in i'll have bunch of animals to select which would be displayed as a menu using this "cover flow" effect. Once a particular animal is selected your piano view for that animal comes up. My piano app will be out soon and you can check that out. The source...



Download an Image and Save it as PNG or JPEG in iPhone SDK

Posted by: kiichi | Date: 05 Apr 2010 | 6 Comments | Tags: ,,,,,,,,, | 
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Here is a quick example to save an image as JPEG or PNG. In this tutorial, I'm getting the image from the Internet then I'm saving it as JPEG and PNG. Key points: NSData to retrieve the image from the URL NSDocumentDirectory to find Document folder's Path UIImagePNGRepresentation to save it as PNG UIImageJPEGRepresentation to save it as JPEG NSLog(@"Downloading..."); // Get an image from the URL below UIImage *image = [[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.objectgraph.com/images/og_logo.png"]]]; NSLog(@"%f,%f",image.size.width,image.size.height); //...



NSMutableDictionary Example – iPhone App Development Basics in Objective-C

Posted by: kiichi | Date: 20 Mar 2010 | 4 Comments | 
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Here is a simple example to add elements in a dictionary and go through a for loop to extract values by keys and make sure to release it whenever you finish using it. NSMutableDictionary *dict = [[NSMutableDictionary alloc] init]; [dict setObject:@"John" forKey:@"Firstname"]; [dict setObject:@"Doe" forKey:@"Lastname"]; [dict setObject:@"info at objectgraph.com" forKey:@"Email"]; NSLog(@"%@", dict); NSArray *keys = [dict allKeys]; // values in foreach loop for (NSString *key in keys) { NSLog(@"%@ is %@",key, [dict objectForKey:key]); }



How to use SBJSON and TouchJSON

Posted by: gavi | Date: 24 Feb 2010 | 3 Comments | 
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We at ObjectGraph have mostly used SBJSON, An excellent library from Stig Brautaset which implements a strict JSON parser and generator in Objective-C. Recently we noticed others using TouchJSON and wanted to explore it to see if it offers any advantages over SBJSON. There has been a good discussion on this subject on stackoverflow.com which can be read here. http://stackoverflow.com/questions/286087/best-json-library-to-use-when-developing-an-iphone-application I will show how to use each of these libraries to decode JSON code in this post. Touch JSON: Include the following in your...



Use NSDateFormatter To Create A Countdown App On iPhone

Posted by: gavi | Date: 18 Feb 2010 | 1 Comment | Tags: , | 
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NSDateFormatter is excellent for date conversions in your iPhone App. We will use this to create a simple count down App. Here is core code using NSDateFormatter. Remember that NSDate Object in Mac OSX and iPhone are different. NSDate *date=[NSDate date]; int secondsNow=(int)[date timeIntervalSince1970]; NSDateFormatter *formatter=[[NSDateFormatter alloc] init]; [formatter setDateFormat:@"yyyy"]; int currentYear = [[formatter stringFromDate:date] intValue]; int nextYear=currentYear+1; NSString *nextYearBegin=[NSString stringWithFormat:@"%d0101",nextYear]; [formatter setDateFormat:@"yyyyMMdd"]; NSDate...



[iPhone App] iMustache

Posted by: saurabh | Date: 08 Oct 2009 | 0 Comment | 
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iMustache adds a mustache on your photos! Turn your friends' face and send the picture to them! [Usage] -1. Select a photo from camera / album icon. -2. Drag and Drop your favorite item. -To cancel, simply put the item back to the top area or double tap on the item. -Use two fingers to scale and rotate. -You can save your work and send it to your friends! Start Screen of App, showing the different Mustache available Click/Browse photos from Library and adjust the mustache Download Now!



[iPhone App] iAfro

Posted by: saurabh | Date: 04 Oct 2009 | 0 Comment | 
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iAfro adds some funkiness on your photos! Turn your friends' hair to afro and send the picture to them! [Usage] -1. Take a photo from camera or select an existing picture from the buttons below -2. Drag and Drop your favorite item. -To cancel, simply put the item back to the top area or double tap on the item. -Use two fingers to scale and rotate. -You can save your work and send it to your friends! Download Now!



Twitter + iPhone = MyTweet

Posted by: gavi | Date: 19 Jun 2009 | 11 Comments | Tags: ,, | 
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I just started playing with Twitter API and was interested to see some good API's in objective-c. The one i started to look at is created by Matt Legend You can see his stuff here Anyway after simply checking(svn co) out his repository, I was able to quickly build a simple client very quickly Here is version 0.000001 alpha Matt nicely uses the standard way of doing things in objetive c with async calls - Delegate - call back mechanism Your View Controller or what ever has to simply implement the protocol MGTwitterEngineDelegate and you are getting responses from Twitter...



iPhone SDK 3.0 – Playing with Map Kit – Part 3

Posted by: gavi | Date: 08 Apr 2009 | 125 Comments | Tags: , | 
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This is a follow up post to my 2 previous posts on the same subject. Please check them here. iPhone SDK 3.0 - Playing with Map Kit iPhone SDK 3.0 - Playing with Map Kit - Part 2 We also started a basics training program in iPhone development. If you or some one you know wants to learn development and live around NYC area, Please promote this Blog Entry:http://blog.objectgraph.com/index.php/2009/05/13/iphone-developer-training-in-ny-city/ Meetup Group: http://www.meetup.com/iPhoneDeveloper Many of the users were asking me how to draw a polyline on this map. From what i can see in the documentation...



YumMaracas! – iPhone App

Posted by: kiichi | Date: 24 Jan 2009 | 0 Comment | Tags:  | 
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We present the newest edition of the Maracas series. Go crazy with "Yummy's Maracas!" Transform your iPhone/iTouch into maracas by shaking your device, and Yummy will also dance for you on the beach! You can choose from 2 different Yummy's. Keep this application for musical splashes of fun. Best of all, it's free!ObjectGraph LLC and Studio YumiCheck out Studio Yumi's new line-up on this Works page...



Accessing Lon/Lat/Alt

Posted by: kiichi | Date: 16 Apr 2008 | 6 Comments | 
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I could access Lon/Lat/Alt values from iPhone's Location Manager class. This is kind neat. I got exact same value that I put my apartment address in google map. When I run this on the simulator, it always returns a address in Santa Clara. Is this Apple's company building address or something? Let me know if anyone familiar with the address below. Download the source code from here LocationSampleViewController.h /* #import CoreLocation/CLError.h CoreLocation/CoreLocation.h CoreLocation/CLLocation.h CoreLocation/CLLocationManager.h CoreLocation/CLLocationManagerDelegate.h */ @interface...



sprintf with NSString

Posted by: gavi | Date: 16 Mar 2008 | 5 Comments | Tags: , | 
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So, I have been struggling to learn Objective C. Here is a snippet of code that might be helpful. Basically you can use NSString's initWithFormat method to create a new NSString object and use it just like sprinf function in C [[NSString alloc] initWithFormat:@"(%f,%f)",center.x,center.y]