Notifications give people information
and functionality that’s important right now. People can get notifications in
various contexts, such as on the lock screen, while they’re using apps, and
when they visit Notification Center.
Notification Center has two views: Today and Notifications
The Today view displays an editable
list of widgets. A Today widget is an app extension that displays a small
amount of timely, high-value information or functionality that’s provided by an
app the user cares about. For example, the Calendar widget displays only
today’s events. Tapping an event in the Calendar widget opens that event in the
Calendar app, where users can edit the event and manage other events.
The Notifications view displays
recent notification items from apps that users are interested in. Users can
visit an app’s area in Settings to specify whether they want notifications from
the app to appear in Notification Center.
iOS apps can use notifications to let
people know when interesting things happen, such as:
* A message has arrived
* An event is about to
* New data is available
* The status of
something has changed
In iOS 8 and later, apps can define
actions that users can take within a notification. For example, a notification
from a to-do app might let users mark an item as done without having to open
iOS defines two types of
A local notification is
scheduled by an app and delivered by iOS on the same device, regardless of
whether the app is currently running in the foreground. For example, a calendar
or to-do app can schedule a local notification to alert people of an upcoming
meeting or due date.
A remote notification (also
called a push notification) is sent by an app’s remote server to the Apple Push
Notification service, which pushes the notification to all devices that have
the app installed. For example, a game that users can play against remote
opponents can update all players with the latest move.
If you receive local or remote
notifications while your app is running in the foreground, you’re responsible
for passing the information to your users in an app-specific way.
To ensure that users can customize
their notification experience, you should support as many as possible of the following
A banner is a small translucent view that
appears onscreen and then disappears after a few seconds. Users can also see a
version of the banner on the lock screen and in the Notifications view of
Notification Center. In the banner, iOS displays your notification message and
the small version of your app icon (to learn more about the small app icon.
Users tap the banner to dismiss it and switch to the app that sent the
In addition to a default action that
users can take by tapping a banner, you can also define two actions that are
revealed when users swipe the banner. Tapping a notification action button
dismisses the banner and launches your app (possibly in the background) to
handle the action.
A notification alert is
a standard alert view that appears onscreen and requires user interaction to
dismiss. You supply the notification message and either a default action or up
to four specific actions that are revealed when users tap the Options button.
You have no control over the background appearance of the alert.
When users tap a default or custom
action button in an alert, iOS simultaneously dismisses the alert
and launches your app (possibly in the background). Tapping the Close or OK
button dismisses the alert without opening your app.
A badge is a small
red oval that displays the number of pending notification items (a badge
appears over the upper-right corner of an app’s icon). You have no control over
the size or color of the badge.