그냥 만들면 생성순서때문에 들어가야할게 안들어 있을 수 있음

.h

#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "EnemySpawner.generated.h"
UCLASS()
class DNA_API AEnemySpawner : public AActor
{
	GENERATED_BODY()
public:	
	AEnemySpawner();
	virtual void Tick(float DeltaTime) override;
protected:
	virtual void BeginPlay() override;
private:
	class AEnemyBase* Enemy;
	UPROPERTY(EditDefaultsOnly, Category = "Enemy")
	TSubclassOf<AEnemyBase> EnemyClass;
	FTimerHandle SpawnTimerHandle;
	UPROPERTY(EditAnywhere, Category = "Spawner")
	float SpawnInterval = 5.0f;
	void SpawnEnemy();
};

.cpp

#include "Enemy/EnemySpawner.h"
#include "Kismet/GameplayStatics.h"
#include "Enemy/EnemyBase.h"
#include "Engine/World.h"
#include "TimerManager.h"
AEnemySpawner::AEnemySpawner()
{
	PrimaryActorTick.bCanEverTick = true;
}
void AEnemySpawner::BeginPlay()
{
    Super::BeginPlay();
    if (EnemyClass)
    {
        // 지정된 시간 간격으로 SpawnEnemy 호출
        GetWorld()->GetTimerManager().SetTimer(
            SpawnTimerHandle, this, &AEnemySpawner::SpawnEnemy,
            SpawnInterval, true
        );
    }
}
void AEnemySpawner::SpawnEnemy()
{
    if (!EnemyClass) return;
    // 스포너 자신의 위치를 기준으로 소환
    FVector SpawnLocation = GetActorLocation();
    FRotator SpawnRotation = GetActorRotation();
    FActorSpawnParameters SpawnParams;
    SpawnParams.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AdjustIfPossibleButAlwaysSpawn;
    AEnemyBase* SpawnedEnemy = GetWorld()->SpawnActor<AEnemyBase>(
        EnemyClass,
        SpawnLocation,
        SpawnRotation,
        SpawnParams
    );
    if (SpawnedEnemy)
    {
        UE_LOG(LogTemp, Log, TEXT("스포너 위치에 적 소환 성공: %s"), *SpawnedEnemy->GetName());
    }
    else
    {
        UE_LOG(LogTemp, Error, TEXT("적 소환 실패"));
    }
}
void AEnemySpawner::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);
}

OnPossess

AIController가 Pawn을 소유(Possess)했을 때 자동으로 호출되는 함수
OnPossess()는 AIController가 Pawn을 완전히 소유한 이후에 호출되기 때문에,
Behavior Tree, Blackboard, GetPawn() 등이 완전하게 안전한 상태에서 접근 가능

void AAIControllerBase::OnPossess(APawn* InPawn)
{
   Super::OnPossess(InPawn);
   
   if (!AIBehavior || !AIBehavior->BlackboardAsset) return;

   UseBlackboard(AIBehavior->BlackboardAsset, BlackboardComponent);

   if (RunBehaviorTree(AIBehavior))
   {
       APawn* PlayerPawn = UGameplayStatics::GetPlayerPawn(GetWorld(), 0);
       if (PlayerPawn)
       {
       	   //bt값 입력
           GetBlackboardComponent()->SetValueAsVector(TEXT("PlayerLocation"), PlayerPawn->GetActorLocation());
           GetBlackboardComponent()->SetValueAsVector(TEXT("StartLocation"), InPawn->GetActorLocation());
       }
   }
}