Local notifications

Learn to send local notifications.

Local notification

A local notification is scheduled by the app itself. No server is needed; all scheduling happens on the device. It is ideal for reminders, alarms and timed tasks.

A local notification is scheduled with Notifications.scheduleNotificationAsync. This function takes a content field (title, body, data) and a trigger field (when to show it). For example trigger: {{ seconds: 10 }} shows the notification ten seconds later.

Content and scheduling

The content field of a notification is an object. title is the notification's heading and body is the body text. data is a free object you can attach; when the user taps the notification you read this object.

For scheduling, trigger takes an object. The simplest option is { { seconds: 10 } } — the notification is shown ten seconds later. For a specific date you can pass a Date object to the date property. For repeating notifications, set repeats to true.

Exercise Schedule a local notification

Complete the empty function. Call Notifications.scheduleNotificationAsync. The first argument is an object: content: {{ title: 'Reminder', body: 'Time is up' }} and trigger: {{ seconds: 5 }}. Await the call.

Show example solution

Notifications.scheduleNotificationAsync({
  content: { title: 'Reminder', body: 'Time is up' },
  trigger: { seconds: 5 },
});

Test yourself

Match each field to its purpose

content

Notification content
trigger

When to show
title

Notification title
seconds

Delay duration

Write the content object

content: { ____: 'Hatırlatma', body: 'Vakti geldi' }

Show answer

content: { title: 'Hatırlatma', body: 'Vakti geldi' }

When is a local notification shown?
- Only when the app gets a signal from the server
- Only when the device connects to the internet
- At the time given by the trigger field
- Only while the app is in the foreground
Show answer

At the time given by the trigger field — The trigger field sets the time; no server is needed.

Next lesson: Remote notifications

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