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Problem with Making Setup(spawn) Manager with C++

※sorry about My Poor English Conversation.

Hello, I'm Making Tile setup Manager for my Game Project.

but, there is some problems with making setup Manager. so I want to get some advices from anyone who knows with this.

first, I have made GridSetup Actor Class, this is setup Manager.

then, I made blueprint class derived from GridSetup actor class.

and, I dragged it to Level viewport.

then, I changed Properties Grid X, Grid Y. (row :Grid X , col : Grid Y) this will be applied in level viewport and Make Grid tile in level.

problem are

  1. supposing when I set initial Grid X and Grid Y to (2,2) in derived blueprint class setting, and I drag it to level viewport. Setup Manager will make 2X2 Grid. when I moved Setup Manager, 2X2 Grid Also be Moved. but there are duplicated 2x2 Grid at initial Position after already moved Setup Manager. alt text

  2. in Derived Class blueprint editor, when I Changed Grid X and Grid Y, Grid will be spawned in blueprint viewport. I compiled and saved, and turn off the blueprint editor. but, I turn on blueprint Editor again, Editor's viewport don't have any Grid.

like this below Images. alt text

alt text

I think, these are results of that I Used improper functions to setup grid.

I used PostEditChangeProperty() function. so, Grid Will be spawned when I Change Grid X and Grid Y.

And I used GetWorld()->SpawnActor to spawn Grid Instances.


 #pragma once
 #include "CoreMinimal.h"
 #include "GameFramework/Actor.h"
 #include "GridSetup.generated.h"
 class TEST_API AGridSetup : public AActor
     // Sets default values for this actor's properties
     // Called when the game starts or when spawned
     virtual void BeginPlay() override;

     UPROPERTY(VisibleAnywhere, Category = Grid)
         class USphereComponent* sphere;
     // resticted max size 50
     UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Grid, meta = (ClampMin = 0, ClampMax = 50))
         int32 grid_x;
     // resticted max size 50
     UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Grid, meta = (ClampMin = 0, ClampMax = 50))
         int32 grid_y;
     UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Grid)
         float gridSize;
     UPROPERTY(EditAnywhere,BlueprintReadWrite, Category = Grid)
         TSubclassOf<class AGridBase> Grid;

     UPROPERTY(VisibleAnywhere,BlueprintReadWrite, Category = Grid)
         TArray <class AGridBase*> gridArray;
     // Called every frame
     //virtual void Tick(float DeltaTime) override;
     virtual void PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent) override;
     void SpawnGrid();


 #include "GridSetup.h"
 #include "GridBase.h"
 #include "Runtime/Engine/Classes/Components/StaticMeshComponent.h"
 #include "Runtime/Engine/Classes/Components/SphereComponent.h"

 // Sets default values
      // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
     PrimaryActorTick.bCanEverTick = false;
     grid_x = 0;
     grid_y = 0;
     gridSize = 128.0f;
     sphere = CreateDefaultSubobject<USphereComponent>(TEXT("SPHERE"));
     RootComponent = sphere;
 // Called when the game starts or when spawned
 void AGridSetup::BeginPlay()
 //// Called every frame
 //void AGridSetup::Tick(float DeltaTime)
 //    Super::Tick(DeltaTime);
 void AGridSetup::PostEditChangeProperty(FPropertyChangedEvent& PropertyChangedEvent)

     SpawnGrid(); // spawn function
 void AGridSetup::SpawnGrid()
     if (!Grid) // grid is not exist, do not anything.
     UWorld* const world = GetWorld();
     if (!world) // check world is valid. 
     for (auto it = gridArray.CreateIterator(); it; it++) // delete all in gridArray
     FVector currentPosition = RootComponent->GetComponentLocation();
     float init_y = currentPosition.Y;
     float init_x = currentPosition.X;
     for (int32 i = grid_x; i != 0; i--)
         for (int32 j = grid_y; j != 0; j--)
             //Grid spawn And add to Array
             AGridBase* newGrid = world->SpawnActor<AGridBase>(Grid, currentPosition, FRotator::ZeroRotator);
             newGrid->AttachToComponent(RootComponent, FAttachmentTransformRules::KeepWorldTransform);
             //next Y position.
             currentPosition.Y += gridSize;
         //if j end, next position for X and init Y position.
         currentPosition.X += gridSize;
         currentPosition.Y = init_y;

I already search another Methods and test my code with OnConstruction() and PostInitializeComponents() but it didn't work.

if I should not Use PostEditChangeProperty() , then What I use for spawn? and, there is Another Spawn Method can be applied in Blueprint Viewport? or, There is any Youtube Tutorial making Tile?

I'm using C++ for Unreal Engine about 2 months for study, and I don't know Very much.

please don't tell me "stop using C++, and just use blueprint for game programming"... ;(

Product Version: UE 4.21
p1.png (63.8 kB)
p2.png (161.4 kB)
p2-2.png (153.5 kB)
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asked Jan 22 '19 at 07:19 PM in C++ Programming

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