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iOS, formerly known as iPhone OS, is the operating system for the [[iPhone]], [[iPod touch]], [[iPad]] and [[K66ap|Apple TV 2G]]. iOS has four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. The OS takes ~350MB of the device's total memory storage, this means that users will not get their full storage space.
  
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{{Infobox OS
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| title = iOS
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| logo = [[File:iOS logo.png|150px]]
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| screenshot = <!-- [[File:iOS.png|320px]] -->
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| caption =
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| developer = [[wikipedia:Apple Inc.|Apple Inc.]]
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| programmed in = [[wikipedia:ARM architecture|ARM&nbsp;assembly]], [[wikipedia:C (programming language)|C]], [[wikipedia:C++|C++]], and [[wikipedia:Objective-C|Objective&#x2011;C]]
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| family = [[wikipedia:Unix-like|Unix-like]] ([[wikipedia:OS X|OS&nbsp;X]])
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| working state = Current
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| source model = Closed source
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| released = {{date|2007|06|27}}
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| update model = [[iTunes]] and [[OTA Updates]]
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| package manager = [[/Applications/AppStore.app|App Store]]
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| supported platforms = [[List of Apple TVs|Apple TV]], [[List of iPads|iPad]], [[List of iPad minis|iPad mini]], [[List of iPhones|iPhone]], [[List of iPod touches|iPod touch]]
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| kernel type = [[wikipedia:Hybrid kernel|Hybrid]] ([[Kernel|XNU]])
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| user interface = [[/System/Library/CoreServices/SpringBoard.app|SpringBoard]]
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| license = [http://www.apple.com/legal/sla/ Proprietary]
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| website = [http://www.apple.com/ www.apple.com]
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}}
   
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'''iOS''', formerly known as '''iPhone OS''', is the operating system for the [[List of Apple TVs|Apple TV]], [[List of iPads|iPad]], [[List of iPad minis|iPad mini]], [[List of iPhones|iPhone]], [[List of iPod touches|iPod touch]]. iOS has four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer.<sup>[outdated?]</sup>
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In iOS 4, it takes up ~800MB of space, ~200MB more than double, probably due to the 2x graphics that have been added for the [[N90ap|iPhone 4]]'s Retina display.
  
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== Name History ==
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Initially, when the [[M68AP|original iPhone]] was announced by Steve Jobs (on {{date|2007|01|09}}), it was said to be running a variant of Mac OS&nbsp;X. This is presumably due to both OSes running on the Darwin/XNU [[kernel]]. After some time<sup>[when?]</sup>, it was announced that the iPhone ran '''iPhone OS'''. This name was kept until version 4.0 when it was renamed to '''iOS'''.
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For the next few years, the iOS moniker was used for the entire iDevice lineup of iPhones, iPod touches, iPads, and Apple TVs. With iOS 9, [[tvOS]], a specialized version of iOS tailored for Apple TVs, was introduced. With iOS 13, [[iPadOS]], another specialized version of iOS, but tailored for iPads, was introduced.
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== History ==
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{{Section Stub}}
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== Size Growth ==
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As new devices and frameworks come out, the [[/|root partition]] needs to hold more and more stuff. Consequently, Apple can't just add a separate [[NAND]] chip to hold the operating system as new releases would use more than available on the chip. As such, with each release, users get less and less ''usable'' storage space.
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When [[jailbreak|jailbroken]], [[Cydia.app|Cydia]] "stashes" certain folders under the [[/private/var|user partition]] to avoid filling the root partition when tweaks and apps are installed. However, Cydia doesn't shrink the root partition (and grow the user partition), so users get ''even less'' available storage space (e.g. if for a 16&nbsp;GiB device with a 2&nbsp;GiB root partition, Cydia "stashes" 1&nbsp;GiB, the usable storage space will be 13&nbsp;GiB). It is unknown if there exist tools to resize and move the partitions around in order to reclaim the empty space on the root partition (what ''was'' occupied by the stashed files).
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Prior to iOS 4, the OS would take up ~350&nbsp;MB of the device's storage on a 500&nbsp;MB partition.
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In iOS 4.0, it takes up ~800&nbsp;MB of space, changing the root partition to 1000&nbsp;MB due to the <code>@2x</code> graphics that have been added for the [[N90AP|iPhone 4 (iPhone3,1)]] and [[N81AP|iPod touch (4th generation)]] retina displays.
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In iOS 5.0, Apple began pushing towards a computer-less experience for iOS. (e.g. devices can be activated and updated over the air.) In addition, multitasking gestures are now enabled by default. It takes up ~700MB for [[N88AP|iPhone 3GS]], ~800MB for [[A4]] and [[A5]].
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In iOS 6.0, it takes up ~850&nbsp;MB of space on the [[S5L8930|A4]] and [[A5|A5 series]] and ~1.2&nbsp;GB on the [[A6|A6 series]].
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In iOS 8.0, it takes up ~4&nbsp;GB on the [[A7|A7 series]].
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In iOS 10.0.1, it takes up ~3.9&nbsp;GB on the [[A9|A9 series]].
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== See Also ==
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* [[Firmware]]
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** [[Beta Firmware]]
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* [[watchOS]]
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* [[tvOS]]
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* [[OTA Updates]]
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** [[Beta OTA Updates]]
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== External Links ==
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* ''[[wikipedia:iOS|iOS]]'' on Wikipedia
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* ''[[wikipedia:iOS version history|iOS version history]]'' on Wikipedia
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[[Category:Operating Systems]]

Latest revision as of 16:30, 6 September 2022

iOS
IOS logo.png
Company / developer Apple Inc.
Programmed in ARM assembly, C, C++, and Objective‑C
OS family Unix-like (OS X)
Working state Current
Source model Closed source
Initial release 27 June 2007
Update method iTunes and OTA Updates
Package manager App Store
Supported platforms Apple TV, iPad, iPad mini, iPhone, iPod touch
Kernel type Hybrid (XNU)
Default user interface SpringBoard
License Proprietary
Official website www.apple.com

iOS, formerly known as iPhone OS, is the operating system for the Apple TV, iPad, iPad mini, iPhone, iPod touch. iOS has four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer.[outdated?]

Name History

Initially, when the original iPhone was announced by Steve Jobs (on 9 January 2007), it was said to be running a variant of Mac OS X. This is presumably due to both OSes running on the Darwin/XNU kernel. After some time[when?], it was announced that the iPhone ran iPhone OS. This name was kept until version 4.0 when it was renamed to iOS.

For the next few years, the iOS moniker was used for the entire iDevice lineup of iPhones, iPod touches, iPads, and Apple TVs. With iOS 9, tvOS, a specialized version of iOS tailored for Apple TVs, was introduced. With iOS 13, iPadOS, another specialized version of iOS, but tailored for iPads, was introduced.

History

This section is a stub; it is incomplete. Please add more content to this section and remove this tag.

Size Growth

As new devices and frameworks come out, the root partition needs to hold more and more stuff. Consequently, Apple can't just add a separate NAND chip to hold the operating system as new releases would use more than available on the chip. As such, with each release, users get less and less usable storage space.

When jailbroken, Cydia "stashes" certain folders under the user partition to avoid filling the root partition when tweaks and apps are installed. However, Cydia doesn't shrink the root partition (and grow the user partition), so users get even less available storage space (e.g. if for a 16 GiB device with a 2 GiB root partition, Cydia "stashes" 1 GiB, the usable storage space will be 13 GiB). It is unknown if there exist tools to resize and move the partitions around in order to reclaim the empty space on the root partition (what was occupied by the stashed files).

Prior to iOS 4, the OS would take up ~350 MB of the device's storage on a 500 MB partition.

In iOS 4.0, it takes up ~800 MB of space, changing the root partition to 1000 MB due to the @2x graphics that have been added for the iPhone 4 (iPhone3,1) and iPod touch (4th generation) retina displays.

In iOS 5.0, Apple began pushing towards a computer-less experience for iOS. (e.g. devices can be activated and updated over the air.) In addition, multitasking gestures are now enabled by default. It takes up ~700MB for iPhone 3GS, ~800MB for A4 and A5.

In iOS 6.0, it takes up ~850 MB of space on the A4 and A5 series and ~1.2 GB on the A6 series.

In iOS 8.0, it takes up ~4 GB on the A7 series.

In iOS 10.0.1, it takes up ~3.9 GB on the A9 series.

See Also

External Links

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