# IOS 11

iOS 11 is the eleventh major release of the iOS mobile operating system developed by Apple, being the successor to iOS 10. It was announced at the company's Worldwide Developers Conference on June 5, 2017, and was released on September 19, 2017. It was succeeded by iOS 12 on September 17, 2018.

## Overview

iOS 11 was introduced at the Apple Worldwide Developers Conference keynote address on June 5, 2017. The first developer beta version was released after the keynote presentation, with the first public beta released on June 26, 2017.
iOS 11 was officially released by Apple on September 19, 2017. It brought many changes to iOS. Some major highlights were:
* The lock screen and Notification Center were combined, allowing all notifications to be displayed directly on the lock screen.
* The control center was completely redesigned, combining all pages into a single unified page. It also brought the ability to rearrange the position of the controls, some of which could be used with 3D Touch for quick access to additional options.
* The App Store received its first major design overhaul since iOS 7 to focus on editorial content and daily highlights.
* A "Files" file manager app allowed access to files stored locally on-device and in iCloud and other cloud services. With this addition, users could also for the first time save files downloaded using Safari right on their iPhone without any third-party apps.
* Siri was updated to translate between languages and use a privacy-minded "on-device learning" technique to better understand a user's interests and offer suggestions.
* The camera introduced new settings for improved portrait-mode photos and utilized new encoding technologies to reduce file sizes on newer devices.
* In a later release of iOS 11, Messages was integrated with iCloud to better synchronize messages across iOS and macOS devices. A previous point release also added support for person-to-person Apple Pay payments.
* It introduced the ability to record the screen, which could be enabled by adding it to the control center in Settings.
* It also introduced rudimentary forms of drag-and-drop functionality.
* Support for augmented reality. Allowing users to "place" virtual objects in the real world and interact with them using their iPhone.
Certain new features are only available on iPad. Some of these features are:
* An always-accessible application dock that could be access by dragging up from the bottom of the screen.
* Cross-app drag-and-drop allowing users to share photos, files, and links easier than ever.
* Adding a new easier way to split-screen apps by simply dragging an app from the dock on to another already open app. The "split" could then be resized to make one app bigger or small depending on what the user wanted.
iOS 11 is also the first version of iOS that does not support 32-bit apps and 32-bit processors, meaning iOS 11 only supports devices with a 64-bit processor. Upon installing iOS 11, if a user tries to open a 32-bit application that had not yet been updated to 64-bit, iOS will simply refuse to run it. iOS 10.3 includes a popup upon launching a 32-bit application to warn users about the upcoming change and a new menu in Settings that allowed users to quickly identify what apps on their device will not be compatible with the iOS 11 update.

## System features
### Lock screen

The lock screen and Notification Center are combined, allowing users to see all notifications directly on the lock screen. Scrolling up and down will either show or hide notifications.

### Control Center

The Control Center has been given another redesign after its short lived one from iOS 10, as it receives new unified pages and now supports 3D Touch (or a long press on devices without 3D Touch) buttons for more options. Sliders adjust volume and brightness. The Control Center is now customizable, and allows more settings to be shown, including cellular service, Low Power Mode, and a shortcut to the Notes app.

### Siri

The Siri intelligent personal assistant has a more human voice and supports language translation, with English, Chinese, French, German, Italian and Spanish available at launch. It also supports follow-up questions by users. Users are also able to type to Siri.
Siri is able to use "on-device learning", a privacy-minded local learning technique to understand a user's behavior and interests inside different apps, to offer better suggestions and recommendations.

### Settings

A new "Do Not Disturb While Driving" mode lets users block unnecessary notifications as long as their iPhone is connected to a vehicle through Bluetooth. An auto-reply feature sends a specific reply to senders of messages to let them know the user is currently unavailable through text. Passengers can be granted full notification access to the phone.
A new "Smart Invert" feature, dubbed a "dark mode" by some publications, inverts the colors on the display, except for images, some apps, and some user interface elements. Using the iPhone X, which utilizes OLED technology, some news outlets have reported that this feature can conserve battery life by turning off pixels when black, saving energy by preventing itself from displaying a white pixel.
Users get expanded control over apps' location usage, with every app featuring a "While Using the App" location toggle in Settings. This differs from previous iOS versions, in which apps were only required to have "Never" or "Always" location options.
Users can remove rarely used apps without losing the app's data using the "Offload App" button. This allows for a later reinstallation of the app (if available on the App Store), in which data returns and usage can continue. Users can also have those apps removed automatically with the "Offload Unused Apps" setting. When an app is offloaded, the app appears on the home screen as a grayed-out icon.
Personalized suggestions will help the user free up storage space on their device, including emptying Photos trash, backing up messages, and enabling iCloud Photo Library for backing up photos and videos.

### iPad

Certain new iOS 11 features are only available on the iPad. The application dock gets an overhaul, bringing it closer to the design seen on macOS, and is accessible from any screen, letting users more easily open apps in split-screen view. Users can also drag-and-drop files across different apps. A new multitasking interface shows multiple apps on the screen at the same time in floating "windows." Additionally, through a combination of "slide over," "split view," and "picture-in-picture" modes, users can have up to four active apps on-screen at the same time.
Each letter on the iPad keyboard features an alternative background number or symbol, accessible by pulling down on the respective key and releasing.
The Control Center is visible in the multitasking window on iPads.
Running iOS 11, the 9.7-inch, 10.5-inch and the 2nd-generation 12.9-inch iPad Pros now have flashlight support.

### Camera

iOS 11 introduces optical image stabilization, flash photography and high dynamic range for portrait photos.
Live Photos receives new "Loop", "Bounce" and "Long Exposure" effects, and uses High Efficiency Image File Format to decrease photo sizes.
On devices with an Apple A10 chip or newer, photos can be compressed in the new High Efficiency Image File Format and videos can be encoded in the new High Efficiency Video Coding video compression format, enabling improved quality while also decreasing size by half.

### Wallpapers

Apple significantly changed the wallpapers available for use with iOS 11. In the initial beta version, released after Apple's developer conference, Apple included one new wallpaper, and removed all the six "Live" animated fish wallpapers, introduced with the iPhone 6S in 2015. The iOS 11.2 release later brought iPhone X/8/8 Plus-exclusive wallpapers to older iPhones.
iPhone X exclusively features six "Live" wallpapers and seven new "Dynamic" wallpapers.

### Other changes

iOS 11 introduces native support for QR code scanning, through the Camera app. Once a QR code is positioned in front of the camera, a notification is created offering suggestions for actions based on the scanned content. Twitter users have so far discovered that joining Wi-Fi networks and adding someone to the contacts list are supported through QR codes.
Third-party keyboards can add a one-handed mode.
Users are able to record the screen natively. In order to record the screen, users must first add the feature to the Control Center through the Settings app. Once added, users can start and stop recordings from a dedicated Control Center icon, with a distinctly colored bar appearing at the top of the screen indicating active recording. Pressing the bar gives the option to end recording, and videos are saved to the Photos app.
When an iOS 11 device is attempting to connect to a Wi-Fi network, nearby iOS 11 or macOS High Sierra devices already connected can wirelessly send the password, streamlining the connection process.
The volume change overlay no longer covers the screen while playing video, and a smaller scrubber appears on the top right of the screen.
After a user takes a screenshot, a thumbnail of the screenshot will appear at the bottom left of the screen. The user can then tap the thumbnail to bring up an interface that allows them to crop, annotate, or delete the screenshot.
Third-party apps are also able to take advantage of iCloud Keychain to allow autofilling passwords.
The user's airline flight information can be viewed in Spotlight through a dedicated widget.
iOS 11 switches the top-left cellular network strength icons from five dots to four signal bars, similar to that before iOS 7.
A new automatic setup feature called "Quick Start" aims to simplify the first-time setup of new devices, with wireless transfer between the old and new device, transferring preferences, Apple ID and Wi-Fi info, preferred Settings, and iCloud Keychain passwords.
Similar to iPad, drag-and-drop file support is available on iPhone, though with more limitations, specifically only supported within apps, not between.
Many of Apple's pre-installed applications, including Notes, Contacts, Reminders, Maps, and App Store, have redesigned home screen icons.
An "Emergency SOS" feature was added that disables Touch ID after pressing the Sleep/Wake button five times in quick succession. It prevents Touch ID from working until the iPhone's passcode has been entered.
iOS 11 adds support for 8-bit and 10-bit HEVC. Devices with an Apple A9 chip or newer support hardware decoding, while older devices support software-based decoding.
When a device running iOS 11 or later is activated, Apple's verification server will check the device's UDID before it could be set up. If the device's UDID is malformed or not present in Apple's database, the device cannot be activated and will be denied access to the verification server. If said device is connected to iTunes, an error message will appear stating that the iPhone could not be activated because "the activation information could not be obtained from the device.

## App features
### Mail

Where there is empty space in the Mail app, users can draw inline.

### Messages

The Messages application synchronizes messages across iOS and macOS through iCloud, reflecting message deletion across devices. This feature was temporarily removed in the fifth beta release and returned on May 29, 2018 when iOS 11.4 was released.
At the time of the iOS 11 announcement in June 2017, Apple presented functionality letting users send person-to-person payments with Apple Pay through Messages. By the time of the iOS 11 release in September 2017, the feature was not present, having been removed in an earlier beta version, with Apple announcing the feature as "coming this fall with an update to iOS 11". It was launched a few days after the iOS 11.2 update went live, although initially only available in the United States.
A new app drawer for iMessage apps aims to simplify the experience of using apps and stickers, and an optimized storage system reduces the backup size of messages.
The Messages app also incorporates a "Business Chat" feature for businesses to communicate directly with customers through the app. This can be accessed through a message icon next to search results of businesses. However, this feature was not included with the initial release of iOS 11 (instead launching with iOS 11.3).
The Messages app on the iPhone X introduces face-tracking emoji called "Animoji" (animated emoji), using Face ID.

### App Store

In addition to a new logo, The App Store receives a complete redesign, with a greater focus on editorial content such as daily highlights, and a design described as "cleaner and more consistent" to other apps developed by Apple. The app's design mimics the design seen in the Apple Music app in iOS 10.

### Maps

At select locations, Apple Maps will offer indoor maps for shopping malls and airports.
New lane guidance and speed limit features aim to guide drivers on unfamiliar roads.

### Photos

The Photos app in iOS 11 gains support for viewing animated GIFs. Users can access GIF images inside an album titled "Animated".
Memories can be viewed while the phone is in portrait orientation.

### Podcasts

The Podcasts app receives a redesign similar to the App Store, with a focus on editorial content.