---
name: "SDL_OnApplicationWillEnterBackground"
section: "3"
platform: "linux"
package: "libsdl3-doc"
version: "3.2.10+ds-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/SDL_OnApplicationWillEnterBackground"
---

# SDL\_OnApplicationWillEnterBackground(3)

Let iOS apps with external event handling report onApplicationWillResignActive.

## NAME

SDL\_OnApplicationWillEnterBackground - Let iOS apps with external event handling report onApplicationWillResignActive.

## HEADER FILE

Defined in SDL3/SDL\_system.h

## SYNOPSIS

```
#include "SDL3/SDL.h"
```

**void SDL\_OnApplicationWillEnterBackground(void);**

## DESCRIPTION

This functions allows iOS apps that have their own event handling to hook into SDL to generate SDL events. This maps directly to an iOS-specific event, but since it doesn't do anything iOS-specific internally, it is available on all platforms, in case it might be useful for some specific paradigm. Most apps do not need to use this directly; SDL's internal event code will handle all this for windows created by

**SDL\_CreateWindow** !

## THREAD SAFETY

It is safe to call this function from any thread.

## AVAILABILITY

This function is available since SDL 3.2.0.