[游戏开发]UE4 常用函数使用方法

CreateDefaultSubobject

1.创建组件

.h
UPROPERTY(EditAnywhere, BlueprintReadWrite)
UActorComponent *MyComp;

.cpp
    MyComp = CreateDefaultSubobject<UActorComponent>("MyComp");

2.获取controller

APlayerController* PlayerController = UGameplayStatics::GetPlayerController(GWorld, 0);

3.获取controller pawn

APlayerController* PlayerController = UGameplayStatics::GetPlayerController(GWorld, 0);
myPawn = PlayerController->GetPawn();

4.Pawn转自己的类型

APlayerController* PlayerController = UGameplayStatics::GetPlayerController(GWorld, 0);
myPawn = PlayerController->GetPawn();
Axxx* xxx = Cast<Axxx>(myPawn);

5.LineTraceSingleByChannel的使用

FVector Start = ;
FVector End = ;
FHitResult OutHitResult;
FCollisionQueryParams QueryParams(SCENE_QUERY_STAT(DestopPresenceCursorTrace), true, this);

bool bSuccess = GetWorld()->LineTraceSingleByChannel(OutHitResult, Start, End, ECC_Visibility, QueryParams);

6.打印到屏幕

GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Green, FString::Printf(TEXT("bSuccess : %d"), (int)bSuccess));
GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, FString::Printf(TEXT("string : %s"), *mystring);