(UE4 4.20)UE4的UObject,UActorComponent,AActor的Tick函数

 

UObject的Tick

UE4中原生的UObject并不支持Tick函数，得继承FTickableGameObject才可以，代码示例如下：

 

#pragma once

#include "CoreMinimal.h"
#include "UObject/NoExportTypes.h"
#include "Tickable.h"
#include "TickObject.generated.h"


/**
 * 
 */
UCLASS()
class MYPROJECT6_API UTickObject : public UObject, public FTickableGameObject
{
	GENERATED_BODY()
	
public:
	UTickObject();
	~UTickObject();

public:
	virtual void Tick(float DeltaTime) override;
	virtual bool IsTickable() const override;
	virtual TStatId GetStatId() const override;

};

 

#include "TickObject.h"


UTickObject::UTickObject()
{

}


UTickObject::~UTickObject()
{

}


void UTickObject::Tick(float DeltaTime)
{

}

bool UTickObject::IsTickable() const
{
	return true;
}

TStatId UTickObject::GetStatId() const
{
	return Super::GetStatID();
}

得非常注意

[1]. 重载GetStatId函数的时候得返回UObject的GetStatID，而不能直接返回0，否则会报错。

[2]. IsTickable函数得返回true 

 

UActorComponent的TickComponent

在构造函数设置 PrimaryComponentTick.bCanEverTick 为 true

UTickActorComponent::UTickActorComponent()
{
	// Set this component to be initialized when the game starts, and to be ticked every frame.  You can turn these features
	// off to improve performance if you don't need them.
	PrimaryComponentTick.bCanEverTick = true;

	// ...
}

	virtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;

 

void UTickActorComponent::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

	// ...
}

AActor的Tick

构造函数设置PrimaryActorTick.bCanEverTick 为 true

ATickActor::ATickActor()
{
 	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;
}

virtual void Tick(float DeltaTime) override;

void ATickActor::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

}