UE4基礎：Gameplay框架（四）UActorComponent 類

• UActorComponent派生自UObject。
• 它是所有“組件”的基類。
• 只有AActor以及其派生類纔能有“組件”。

聲明

UCLASS(DefaultToInstanced, BlueprintType, abstract, meta=(ShortTooltip="An ActorComponent is a reusable component that can be added to any actor."), config=Engine)
class ENGINE_API UActorComponent : public UObject, public IInterface_AssetUserData
{
	GENERATED_BODY()
	...
}

生命週期

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

virtual void BeginPlay();
virtual void EndPlay(const EEndPlayReason::Type EndPlayReason);

virtual void OnRegister();
virtual void OnUnregister();

關於Tick

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

UFUNCTION(BlueprintCallable, Category="Utilities")
virtual void SetComponentTickEnabled(bool bEnabled);

UFUNCTION(BlueprintCallable, Category="Utilities")
virtual bool IsComponentTickEnabled() const;

關於Tag

UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Tags)
TArray<FName> ComponentTags;

UFUNCTION(BlueprintCallable, Category="Components")
bool ComponentHasTag(FName Tag) const;

關於Activate

UFUNCTION(BlueprintCallable, Category="Components|Activation", meta=(UnsafeDuringActorConstruction="true"))
virtual void Activate(bool bReset=false);

UFUNCTION(BlueprintCallable, Category="Components|Activation", meta=(UnsafeDuringActorConstruction="true"))
virtual void Deactivate();

UFUNCTION(BlueprintCallable, Category="Components|Activation", meta=(UnsafeDuringActorConstruction="true"))
virtual void SetActive(bool bNewActive, bool bReset=false);

UFUNCTION(BlueprintCallable, Category="Components|Activation", meta=(UnsafeDuringActorConstruction="true"))
bool IsActive() const { return bIsActive; }