From Wikipedia, the free encyclopedia
  (Redirected from IPhone SDK)
Jump to: navigation, search
iOS SDK (Software Development Kit)
Logo for iOS SDK.png
IOS SDK New Project.png
iOS SDK 8 included in Xcode 6.2 final.
Original author(s) Apple Inc.
Developer(s) Apple Inc.
Initial release March 6, 2008 (2008-03-06)
Stable release
iPhone 4, 4S, 5, 5C and 5S
iPad 2, 3rd, 4th generations and Air
iPad Mini 1st and 2nd generations
iPod Touch 5th generation

7.1.1 (Build 11D201) (April 22, 2014; 10 months ago (2014-04-22)) [±][1]

Apple TV 2nd and 3rd generations
6.1 (Build 11D169b) (March 10, 2014; 11 months ago (2014-03-10)) [±][2]
Preview release
iPhone 4S, 5, 5C and 5S
iPad 2, 3rd 4th generations and Air
iPad Mini 1st and 2nd generations
iPod Touch 5th generation
8.0 Beta 6 f(Build 12A4345f) (August 4, 2014; 6 months ago (2014-08-04)) [±]
Development status Active
Written in Objective-C
Operating system OS X
Available in English
Type Software development kit
Website Apple Developer

The iOS SDK (Software Development Kit) (formerly iPhone SDK) is a software development kit developed by Apple Inc. and released in February 2008 to develop native applications for iOS.



On October 17, 2007, in an open letter posted to Apple's "Hot News" weblog, Steve Jobs announced that a software development kit (SDK) would be made available to third-party developers in February 2008.[3] The SDK was released on March 6, 2008, and allows developers to make applications for the iPhone and iPod Touch, as well as test them in an "iPhone simulator". However, loading an application onto the devices is only possible after paying an iOS Developer Program fee, which is $99.00 USD per year.[4] Since the release of Xcode 3.1, Xcode is the development environment for the iOS SDK. iPhone applications, like OS X applications, are written in Swift and Objective-C,[5] with some elements of an application able to be written in C or C++.

SDK release history[edit]

Apple normally releases a new SDK concurrently with every major (iOS x.0 – e.g. iOS 6.0) and minor (iOS x.x, e.g. iOS 5.1) iOS update. Several beta SDKs are usually released to developers before the version is released publicly. The betas are intended to be used for testing for compatibility with existing applications and to add features that are newly available in that version of iOS.[6]

Obsolete Discontinued Current release Old Release Beta Old beta Future Release

iPhone OS 1.x: SDK[edit]

iPhone OS 2.x: SDK[edit]

iPhone OS 3.x: SDK[edit]

iOS 4.x: SDK[edit]

iOS 5.x: SDK[edit]

iOS 6.x: SDK[edit]

iOS 7.x: SDK[edit]

iOS 8.x: SDK[edit]

Table of versions: iOS 8.x SDK
Version Build Release date Features/Notes iTunes version Xcode version

iOS 8.0 beta 1[edit]

12A4265u June 2, 2014 Release of iOS 8 beta iTunes 11.2.2 Xcode 6

iOS 8.0 beta 2[edit]

12A4297e June 17, 2014 Xcode 6

iOS 8.0 beta 3[edit]

12A4318c July 7, 2014 Xcode 6

iOS 8.0 beta 4[edit]

12A4331d July 21, 2014 Xcode 6

iOS 8.0 beta 5[edit]

12A4345d August 4, 2014 Xcode 6

iOS 8.0 Golden Master[edit]

12A365 September 9, 2014 iTunes 11.4.0 Xcode 6

iOS 8.0 Final[edit]

12A365 September 17, 2014 iTunes 11.4.018 Xcode 6.0.1

iOS 8.1 beta 1[edit]

12B401 September 29, 2014 Release of iOS 8.1 beta Xcode 6.1

iOS 8.1 beta 2[edit]

12B407 October 7, 2014 Xcode 6.1 GM seed 2

iOS 8.1 Final[edit]

iPad=12B410 iPhone=12B411 October 20, 2014 iTunes 12.0.1 Xcode 6.1 build 6A1052d

iOS 8.1.1 beta 1[edit]

12B432 November 3, 2014 Release of iOS 8.1.1 beta

iOS 8.1.1 Final[edit]

12B435 November 17, 2014

iOS 8.2 beta 1[edit]

12B436 November 18, 2014 Release of iOS 8.2 beta Xcode 6.2 with WatchKit

iOS 8.2 beta 2[edit]

12D445d December 10, 2014 Xcode 6.2

iOS 8.2 beta 3[edit]

December 18, 2014 Xcode 6.2

iOS 8.2 beta 4[edit]

January 12, 2015 Xcode 6.2

iOS 8.2 beta 5[edit]

February 2, 2015 Xcode 6.2

iOS 8.3 beta 1[edit]

12F5027d February 9, 2015 Release of iOS 8.3 beta, concurrent with iOS 8.2 beta 5 Xcode 6.3

iOS 8.3 beta 2[edit]

February 23, 2015 Xcode 6.3
Version Build Release date Features/Notes iTunes version Xcode version


Developers are able to set any price above a set minimum for their applications to be distributed through the App Store, of which they will receive a 70% share. Alternately, they may opt to release the application for free and need not pay any costs to release or distribute the application except for the membership fee.[27]

Since its release, there has been some controversy regarding the refund policy in the fine print of the Developer Agreement with Apple. According to the agreement that developers must agree to, if someone purchases an app from the app store, 30% of the price goes to Apple, and 70% to the developer. If a refund is granted to the customer (at Apple's discretion), the 30% is returned to the customer from Apple, and 70% from the developer; however, Apple can then take another 30% of the cost from the developer to make up for Apple's loss.[28]

SDK contents[edit]

As iOS uses a variant of the same XNU kernel that is found in OS X, the tool chain used for developing on iOS is also based on Xcode.

The SDK contents is broken down into the following sets:[29]

Along with the Xcode toolchain, the SDK contains the iPhone Simulator, a program used to simulate the look and feel of the iPhone on the developer's desktop. Originally called the Aspen Simulator, it was renamed with the Beta 2 release of the SDK. Note that the iPhone Simulator is not an emulator and runs code generated for an x86 target rather than ARM.

The latest SDK, iOS 6.0 SDK in Xcode 4.5, requires an Intel Mac running Mac OS X 10.7.4 "Lion" or later. Other operating systems, including Microsoft Windows and older versions of Mac OS X, are not supported.[30]

Core Location[edit]

Core Location is a software framework in iOS. It is primarily used by applications on iOS (formerly iPhone OS) 2.0 or later for detection of the device's location, and on supported devices running iPhone OS 3.0 or later, the device's heading. On the iPod Touch and iPad (Wifi-only models), Core Location uses Skyhook Wireless's Wi-Fi-based positioning system. On the original iPhone, it uses cellular tower triangulation in addition to Wi-Fi positioning. On the iPhone 3G or newer and iPad (Wifi + Cellular models), it also uses the available GPS hardware, and the iPhone 4S uses all the aforementioned technologies with the addition of GLONASS. The actual selection of location method is abstracted from the user and developer.

Core Location also allows applications to retrieve the device's heading from the built-in magnetometer (digital compass). It not only can detect the magnetic heading and true heading (combined with the GPS), but also can get raw heading data.[31] Heading information is only available in iPhone OS 3.0 or later running on the iPhone 3GS or newer and all iPad models.

The framework was announced as part of the iPhone Software Roadmap event on March 6, 2008,[32] and was made available as part of the iOS SDK.


Mobile Safari supports SVG starting with iPhone OS 2.1. The SVG support features scripting and most of the static parts of the SVG 1.1. specification. SMIL animation is not yet supported for SVG graphics. It will be delivered after the Webkit SMIL implementation is mature enough. In addition to SVG, the HTML Canvas is supported.


Restrictions imposed by iOS Developer Program License[edit]

Terms in the iOS Developer Program License were relaxed by Apple in September 2010 with regard to using other interpreter languages. [33][34]


Java running on an iOS platform currently is outside the bounds of the iOS SDK Agreement. The guideline in question is rule 3.3.2, which reads and which was changed after Sept 2010:

3.3.2 — An Application may not itself install or launch other executable code by any means, including without limitation through the use of a plug-in architecture, calling other frameworks, other APIs or otherwise. No interpreted code may be downloaded or used in an Application except for code that is interpreted and run by Apple’s Documented APIs and built-in interpreter(s).

In 2008, Sun Microsystems announced plans to release a Java Virtual Machine (JVM) for iOS, based on the Java Platform, Micro Edition version of Java. This would enable Java applications to run on iPhone and iPod Touch.[35] Soon after the announcement, developers familiar with the SDK's terms of agreement believed that by not allowing 3rd-party applications to run in the background (answer a phone call and still run the application, for example),[36] allowing an application to download code from another source, or allowing an application to interact with a 3rd-party application (Safari with JVM, for example), could hinder development of the JVM without Apple's cooperation.[37]

It is possible to install and use a J2ME stack on an iPhone, though it involves jailbreaking.[38][39]

In 2008, there were talks between Sun and Apple concerning the availability of Java on the iPhone, and that Sun was working in that intent with a company called Innaworks.[40][41] Since it is required that all ARM9 or later processors include Jazelle support, the iPhone includes the hardware for accelerated Java execution.[42]


It is not permissible to install a .NET Framework or similar runtime on an iPhone, but by using Xamarin's commercial MonoTouch framework it is possible to achieve similar results. MonoTouch uses a custom fork of the Mono Project to compile all CLI bytecode in .NET to native ARM machine-code ahead of time.[43]

Since this framework is fully compatible with CLI compliant languages that do not emit runtime compiled code it is possible to develop with the wide range of languages supported by .NET, including C# and Visual Basic .NET. Though at this time the MonoTouch native ARM code compiler only supports C# with plans for Visual Basic .NET in the future.[44]


iOS does not support Adobe Flash, and Flash movies on web pages cannot be viewed in Mobile Safari[note 1]. Although Adobe has two versions of its software – Flash and Flash Lite – Apple views neither as suitable for the iPhone, claiming that full Flash would be too cumbersome for the iPhone, while Flash Lite would not provide a worthy experience for the users.[46]

Flash for Apple is a virtual machine with a just-in-time compiler. Apple's iOS SDK prevents any software on the iPhone from downloading or running external executable code (e.g. a virtual machine). Additionally, apps built under the iPhone Developer Program License Agreement for the iPhone SDK 4 Beta may not be originally written in any other programming language than C, C++, or Objective-C.[47] What Adobe had done in their CS5 release for the iPhone was to create a static compiler that allows developers to compile their Flash programs into apps that can run on the iPhone.[48] This would have allowed many Flash games to become apps, but still preventing web interfaces such as Hulu from working on the iPhone. But as these apps wouldn't have been originally written in C, C++ or Objective-C, they may not pass the App Store approval process when done under the terms of the iPhone SDK 4 Beta.

Unofficially, some Flash video sites can be viewed by using a jailbroken iPhone with certain third-party applications.[49] However, it results on extremely low frame rate due to the lack of memory bandwidth and CPU speed for Flash JIT execution. Another reason is the general lack of optimization of Flash for iOS, which can be seen in several benchmarks of Flash in Mac OS X.[50]

Since November 2009, Adobe has posted the following notice on the Flash download page when viewed from an iPhone:[51]

Flash Player not available for your device

“Apple restricts use of technologies required by products like Flash Player. Until Apple eliminates these restrictions, Adobe cannot provide Flash Player for the iPhone, iPod Touch and iPad.”

In November 2011, Adobe announced that they would no longer continue to develop a mobile version of Flash.[52]


The SDK itself is a free download, but beta SDKs require a paid developer account. In order to release software, one must enroll in the iPhone Developer Program—a step requiring payment and Apple's approval. As of February 2015, cost of enrollment in the iPhone Developer Program is US$99 per year (the cost varies from country to country) for the standard program. Signed keys are provided to upload the application to Apple's App Store. Applications can be distributed in three ways: through the App Store, through enterprise deployment to a company's employees only, and on an "Ad-hoc" basis to up to 100 iPhones. Once distributed through the App Store, a developer can request up to 50 promotional codes that can be used to freely distribute a commercial application he or she has developed. The SDK can only be installed in OS X, and the latest SDK (iOS SDK 8.0 with Xcode 6.0.1, as of September 2014) requires OS X 10.9.4 "Mavericks" or later.

See also[edit]

External links[edit]


  1. ^ Note that there are workarounds available which implement Flash in JavaScript – though they are not widely used.[45]


  1. ^ "iOS 7.0.6". Apple. 2014-02-21. Retrieved 2014-02-21. 
  2. ^ "Apple security updates". Apple Inc. 2013-06-19. Retrieved 2013-06-26. 
  3. ^ Jobs, Steve (October 17, 2007). "Third Party Applications on the iPhone". Apple. Archived from the original on October 20, 2007. Retrieved June 24, 2014. 
  4. ^ "iOS Developer Program". Apple. Retrieved March 7, 2011. 
  5. ^ "Did Apple Make A Mistake Choosing Objective-C For iPhone SDK? at Simon’s Blog". Psynixis. April 25, 2008. Retrieved May 9, 2010. 
  6. ^ "Pre-Release Software". Apple Developer (support). Apple. Retrieved October 5, 2012. 
  7. ^ Block, Ryan (March 6, 2008). "Live from Apple's iPhone SDK press conference". Engadget. Weblogs. Retrieved December 12, 2008. 
  8. ^ Dan, Moren (March 27, 2008). "iPhone SDK: now with 100% more Interface Builder". Macworld. Retrieved March 27, 2008. 
  9. ^ "Interface Builder". Apple Inc. Retrieved March 27, 2008. 
  10. ^ Apple Seeds New iPhone OS 2.0 Beta (5A240d), SDK Update (Beta 3) - MacRumors April 8, 2008.
  11. ^ iPhone SDK Beta 4 Now Available, Comes with OpenGL ES 3D Graphics Support - Gizmodo.
  12. ^ iPhone SDK Beta 5 Now Up: Bug Fixes, Updated OS Support - Gizmodo.
  13. ^ MacRumors - Apple's .Mac Service to be Renamed, Revamped? - MacRumors May 30, 2008.
  14. ^ Mac OS 10.6 reference in iPhone SDK beta 6 - MacRumors May 29, 2008.
  15. ^ "Beta Firmware". The iPhone Wiki. iPhone. 
  16. ^ "iPhone SDK beta release 8 - Download Notes". Apple Inc. June 26, 2008. Retrieved June 27, 2008. 
  17. ^ "iPhone SDK 2.1 beta release 1 released". Gearlive. July 25, 2008. Retrieved July 25, 2008. 
  18. ^ "Apple Seeds 2nd Beta of iPhone 2.1 Firmware to Developers". MacRumors. July 30, 2008. 
  19. ^ "Apple Releases iPhone Firmware 2.1 Beta 3". MacRumors. August 8, 2008. 
  20. ^ The iPhone - iPhone OS 2.2 Developers beta released
  21. ^ "iPhone OS 3.0 is coming, preview on March 17th". Engadget. Retrieved May 9, 2010. 
  22. ^ Martin, David (April 1, 2009). "Apple releases iPhone OS 3 beta 2 to developers". CNET Reviews. Retrieved April 3, 2009. 
  23. ^ Ziegler, Chris (April 15, 2009). "iPhone OS 3.0 beta 3 goes live". Engadget. Retrieved April 15, 2009. 
  24. ^ Miller,Ross (April 28, 2009). "iPhone OS 3.0 beta 4, iTunes 8.2 pre-release now live". Engadget. Retrieved April 28, 2009. 
  25. ^ Miller, Ross (May 6, 2009). "iPhone OS 3.0 beta 5 now available". Engadget. Retrieved May 6, 2009. 
  26. ^ a b c Erica Ogg (June 8, 2009). "Live blog: WWDC 2009 keynote". CNET. Retrieved February 13, 2013. 
  27. ^ "Introducing the iPhone Developer Program". Apple Inc. 
  28. ^ "iPhone developers could be bankrupted". 
  29. ^ Arnold, Kim (March 6, 2008). "Apple Releases iPhone SDK, Demos Spore, Instant Messaging". Retrieved March 10, 2008. 
  30. ^ "Support - iOS Dev Center - Apple Developer". Apple, Inc. November 10, 2010. 
  31. ^ "CLHeading Reference". Retrieved September 14, 2012. 
  32. ^ Dalrymple, Jim. "Apple unveils iPhone SDK | Mobile". Macworld. Retrieved May 9, 2010. 
  33. ^ "Statement by Apple on App Store Review Guidelines". Apple Inc. September 9, 2010. Retrieved August 26, 2011. 
  34. ^ Peter Kafka (September 9, 2010). "Apple Hands App Developers an Olive Branch. What About Adobe and AdMob?". All things D. Retrieved August 26, 2011. 
  35. ^ Krill, Paul (March 8, 2008). "Sun: We'll put Java on the iPhone". Infoworld. Retrieved March 8, 2008. 
  36. ^ Krazit, Tom (March 7, 2008). "The iPhone SDK: The day after". CNet. Retrieved March 29, 2008. 
  37. ^ Krill, Paul (March 14, 2008). "Sun's plan for Java on iPhone could hit roadblock". The Industry Standard. Retrieved March 29, 2008. 
  38. ^ Guisi, Bruno (May 25, 2008). "First steps with iPhone and Java". Retrieved August 31, 2008. 
  39. ^ Chakraborty, Angsuman (June 10, 2008). "How To Install, Compile, Run Java On iPhone". Retrieved August 31, 2008. 
  40. ^ Kizito Kasozi, Emmanuel (April 28, 2008). "Apple, Sun Talks Gives Hope for Java on iPhone". Retrieved August 31, 2008. 
  41. ^ "Innaworks announces Java Development Solution for iPhone". Innaworks. March 28, 2008. Retrieved August 31, 2008. 
  42. ^ Block, Ryan (July 1, 2007). "iPhone processor found: 620MHz ARM CPU.". Retrieved January 2, 2009. 
  43. ^ Paul, Ryan (September 15, 2009). "MonoTouch drops .NET into Apple's walled app garden". Ars Technica. Retrieved November 23, 2009. 
  44. ^ "MonoTouch FAQ". Xamerin. June 27, 2012. Retrieved July 9, 2012. 
  45. ^ Irish, Paul, "Demos", Gordon .
  46. ^ Krazit, Tom (March 19, 2008). "Adobe realizes SDK not enough for Flash on iPhone | Apple". News. CNET. Retrieved May 9, 2010. 
  47. ^ Gruber, John (April 8, 2010). "New iPhone Developer Agreement Bans the Use of Adobe’s Flash-to-iPhone Compiler". Daring Fireball. Retrieved April 12, 2010. 
  48. ^ Parr, Ben. "Adobe Announces Flash Support for iPhone (But Only for Apps)". Mashable. Retrieved May 9, 2010. 
  49. ^ iMobile cinema .
  50. ^ Paul, Ryan (October 17, 2008). "Benchmarking Flash Player 10 (Updated)". Ars technica. Retrieved May 9, 2010. 
  51. ^ "Adobe Gets Sharky Snarky With Apple's iPhone Flash Ban – iPhone Flash Support". Gizmodo. November 2, 2009. Retrieved May 9, 2010. 
  52. ^ "Flash to Focus on PC Browsing and Mobile Apps". Adobe. November 9, 2011. Retrieved December 17, 2012.