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> Unreal Engine API Reference > Runtime > Engine > Components > UApplicationLifecycleComponent

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UApplicationLifecycleComponent

Component to handle receiving notifications from the OS about application state (activated, suspended, termination, etc).

Windows

MacOS

Linux

Inheritance Hierarchy

UObjectBase

UObjectBaseUtility

UObject

UActorComponent

UApplicationLifecycleComponent

ULuminApplicationLifecycleComponent

References

Module	Engine
Header	/Engine/Source/Runtime/Engine/Classes/Components/ApplicationLifecycleComponent.h
Include	#include "Components/ApplicationLifecycleComponent.h"

Syntax

class UApplicationLifecycleComponent : public UActorComponent

Remarks

Component to handle receiving notifications from the OS about application state (activated, suspended, termination, etc).

Variables

	Name	Description
FApplicationLif...	ApplicationHasEnteredForegroundDelegate	Called when the application is returning to the foreground (reverse any processing done in the EnterBackground delegate)
FApplicationLif...	ApplicationHasReactivatedDelegate	Called when the application has been reactivated (reverse any processing done in the Deactivate delegate)
FApplicationSta...	ApplicationReceivedStartupArgumentsDelegate	Called with arguments passed to the application on statup, perhaps meta data passed on by another application which launched this one.
FApplicationLif...	ApplicationShouldUnloadResourcesDelegate	Called when the OS is running low on resources and asks the application to free up any cached resources, drop graphics quality etc.
FApplicationLif...	ApplicationWillDeactivateDelegate	This is called when the application is about to be deactivated (e.g., due to a phone call or SMS or the sleep button).
FApplicationLif...	ApplicationWillEnterBackgroundDelegate	This is called when the application is being backgrounded (e.g., due to switching to another app or closing it via the home button) The game should release shared resources, save state, etc..., since it can be terminated from the background state without any further warning.
FApplicationLif...	ApplicationWillTerminateDelegate	This may be called when the application is getting terminated by the OS.
FOnLowPowerMode...	OnLowPowerModeDelegate	Called when we are in low power mode.
FOnTemperatureC...	OnTemperatureChangeDelegate	Called when temperature level has changed, and receives the severity.

Constructors

	Name	Description
	UApplicationLifecycleComponent ( const FObjectInitializer& ObjectIn... )

Overridden from UActorComponent

		Name	Description
	void	OnRegister()	Called when a component is registered, after Scene is set, but before CreateRenderState_Concurrent or OnCreatePhysicsState are called.
	void	OnUnregister()	Called when a component is unregistered.

Classes

	Name	Description
	FApplicationLifetimeDelegate
	FApplicationStartupArgumentsDelegate
	FOnLowPowerModeDelegate
	FOnTemperatureChangeDelegate

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