C++로 Blueprint 클래스 확장

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/StaticMeshComponent.h" // 추가할 컴포넌트를 위해 미리 포함
#include "MyAwesomeActor.generated.h" // 항상 마지막

UCLASS()
class MYFIRSTCPPPROJECT_API AMyAwesomeActor : public AActor
{
    GENERATED_BODY()

public:
    // Sets default values for this actor's properties
    AMyAwesomeActor();

protected:
    // Called when the game starts or when spawned
    virtual void BeginPlay() override;

public:
    // Called every frame
    virtual void Tick(float DeltaTime) override;

    // StaticMeshComponent를 위한 포인터 선언
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Components")
    UStaticMeshComponent* MyStaticMesh;

    // 블루프린트에서 변경 가능하도록 노출할 속성
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Custom Properties")
    FString WelcomeMessage;

    // 블루프린트에서 호출할 수 있는 함수
    UFUNCTION(BlueprintCallable, Category = "Custom Functions")
    void PrintWelcomeMessage();
};

// MyAwesomeActor.cpp
#include "MyAwesomeActor.h"
#include "Components/StaticMeshComponent.h" // StaticMeshComponent를 위해 다시 포함 (보통 헤더에서 미리 함)
#include "Engine/Engine.h" // GEngine->AddOnScreenDebugMessage를 위해 포함

// Sets default values
AMyAwesomeActor::AMyAwesomeActor()
{
    // 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;

    // UStaticMeshComponent 생성 및 Root Component로 설정
    MyStaticMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MyMesh"));
    RootComponent = MyStaticMesh;

    // 변수 기본값 설정
    WelcomeMessage = TEXT("Hello from C++!");
}

// Called when the game starts or when spawned
void AMyAwesomeActor::BeginPlay()
{
    Super::BeginPlay();

    // BeginPlay 시 메시 출력
    PrintWelcomeMessage();
}

// Called every frame
void AMyAwesomeActor::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}

void AMyAwesomeActor::PrintWelcomeMessage()
{
    if (GEngine)
    {
        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, WelcomeMessage);
    }
    UE_LOG(LogTemp, Warning, TEXT("%s"), *WelcomeMessage);
}