---
title: "Shutdown and Draining"
description: "Learn more about the default behavior of our SDK if the application shuts down unexpectedly."
url: https://docs.sentry.io/platforms/apple/configuration/draining/
---

# Shutdown and Draining | Sentry for Apple

The default behavior of most SDKs is to send out events over the network asynchronously in the background. This means that some events might be lost if the application shuts down unexpectedly. The SDKs provide mechanisms to cope with this.

The Apple SDK automatically stores the Sentry events on the device's disk before shutdown.

There are times where you may need to manually call `close()` to ensure that events are sent before the app terminates. For example, if an app user revokes some privacy consent and the app can't use Sentry anymore, calling `close()` will still send the events to Sentry.

```swift
SentrySDK.close()
```