IPhone iOS 5 Architecture and SDK Frameworks - Revision history

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2016-05-05T14:36:51Z
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Neil: Text replacement - "BUY_IOS5" to "ios9_upgrade"

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Neil: Text replacement - "ADSDAQBOX_FLOW" to "adsdaqbox_flow"

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Neil at 15:18, 7 November 2011

2011-11-07T15:18:04Z

Neil: /* An Overview of the iOS 5 Architecture */

2011-11-07T15:17:09Z

‎An Overview of the iOS 5 Architecture

Neil: /* An Overview of the iOS 5 Architecture */

2011-11-07T15:16:50Z

‎An Overview of the iOS 5 Architecture

Neil: /* An Overview of the iOS 5 Architecture */

2011-10-25T13:33:56Z

‎An Overview of the iOS 5 Architecture

Neil at 15:43, 19 October 2011

2011-10-19T15:43:22Z

Neil: /* An Overview of the iOS 5 Architecture */

2011-10-10T13:52:39Z

‎An Overview of the iOS 5 Architecture

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 These operating system layers can be presented diagrammatically as illustrated in Figure 3-1:
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 These operating system layers can be presented diagrammatically as illustrated in Figure 3-1:
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	As an app developer your access to the System interfaces is restricted for security and stability reasons. Those interfaces that are available to you are contained in a C-based library called LibSystem. As with all other layers of the iOS stack, these interfaces should be used only when you are absolutely certain there is no way to achieve the same objective using a framework located in a higher iOS layer.		As an app developer your access to the System interfaces is restricted for security and stability reasons. Those interfaces that are available to you are contained in a C-based library called LibSystem. As with all other layers of the iOS stack, these interfaces should be used only when you are absolutely certain there is no way to achieve the same objective using a framework located in a higher iOS layer.
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		+	Contents]]<td width="20%" align="right">[[Joining the Apple iOS Developer Program\|Next]]</td>
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		+	<td width="20%">The Anatomy of an iPhone 4S<td align="center"><td width="20%" align="right">Joining the Apple iOS Developer Program</td>
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← Older revision		Revision as of 15:43, 19 October 2011
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	In [[The Anatomy of an iPhone 4S]] we looked at the hardware contained within an iPhone 4S device. When we develop apps for the iPhone, Apple does not allow us direct access to any of this hardware. In fact, all hardware interaction takes place exclusively through a number of different layers of software which act as intermediaries between the application code and device hardware. These layers make up what is known as an operating system. In the case of the iPhone, this operating system is known as iOS.		In [[The Anatomy of an iPhone 4S]] we looked at the hardware contained within an iPhone 4S device. When we develop apps for the iPhone, Apple does not allow us direct access to any of this hardware. In fact, all hardware interaction takes place exclusively through a number of different layers of software which act as intermediaries between the application code and device hardware. These layers make up what is known as an operating system. In the case of the iPhone, this operating system is known as iOS.
	In order to gain a better understanding of the iPhone development environment, this chapter will look in detail at the different layers that comprise the iOS operating system and the frameworks that allow us, as developers, to write iPhone applications.		In order to gain a better understanding of the iPhone development environment, this chapter will look in detail at the different layers that comprise the iOS operating system and the frameworks that allow us, as developers, to write iPhone applications.

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 These operating system layers can be presented diagrammatically as illustrated in Figure 3-1:
 [[Image:iPhoneOSArchitecture.png|The iOS 5 SDK Architecture Diagram]]
 Some diagrams designed to graphically depict the iOS software stack show an additional box positioned above the Cocoa Touch layer to indicate the applications running on the device. In the above diagram we have not done so since this would suggest that the only interface available to the app is Cocoa Touch. In practice, an app can directly call down any of the layers of the stack to perform tasks on the physical device.