（192）头文件 ：

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/StaticMeshComponent.h" 
#include "Components/SphereComponent.h"
#include "GameFramework/projectileMovementComponent.h"
#include "MyBulletActor.generated.h"

UCLASS()
class UE5_CPP_YUXIANGROUSI_API AMyBulletActor : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	AMyBulletActor();

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

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

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "我的组件")
	UStaticMeshComponent         * ptrMySMComp;

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "我的组件")
	USphereComponent             * ptrMyBallColliComp;

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "我的组件")
	UProjectileMovementComponent * ptrMyProjectileComp;

};

++

（193） 源文件 ：

#include "MyBulletActor.h"

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

	//R* UObject::CreateDefaultSubobject<R>(FName SubobjectName, bool bTransient = false)
	ptrMySMComp         = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MySM"));
	ptrMyBallColliComp  = CreateDefaultSubobject<USphereComponent>(TEXT("MyBall"));
	ptrMyProjectileComp = CreateDefaultSubobject<UProjectileMovementComponent>(TEXT("MyProjectile"));

	ConstructorHelpers::FObjectFinder<UStaticMesh> tmpSM(TEXT( //加载静态网络体资源
		"/Script/Engine.StaticMesh'/Game/StarterContent/Shapes/Shape_Sphere.Shape_Sphere'"));

	ptrMySMComp->SetStaticMesh(tmpSM.Object); //加载球体资源并赋值给 SM 组件
	//bool UStaticMeshComponent::SetStaticMesh(UStaticMesh* NewMesh)

	ptrMySMComp->SetRelativeScale3D(FVector(0.4, 0.4, 0.4)); //缩放 SM 组件
	//void USceneComponent::SetRelativeScale3D(FVector NewScale3D)

	RootComponent = ptrMySMComp; //TObjectPtr<USceneComponent> AActor::RootComponent;
	ptrMyBallColliComp->SetupAttachment(ptrMySMComp); //设置根组件并挂靠球形碰撞
	//void USceneComponent::SetupAttachment(class USceneComponent* InParent, FName InSocketName = NAME_None)
	
	ptrMyProjectileComp->SetUpdatedComponent(ptrMySMComp); //Assign the component we move and update
	//void UMovementComponent::SetUpdatedComponent(USceneComponent* NewUpdatedComponent)

	// Initial speed of projectile. If greater than zero, 
	// this will override the initial Velocity value and instead treat Velocity as a direction. 
	// 弹道的初始速度。如果大于零，这将覆盖初始速度值，并且将以速度作为方向来处理。
	ptrMyProjectileComp->InitialSpeed = 1200; //float UProjectileMovementComponent::InitialSpeed
	ptrMyProjectileComp->MaxSpeed     = 2400; //float UProjectileMovementComponent::MaxSpeed
	
	ptrMyProjectileComp->bRotationFollowsVelocity = true; 
	//uint8 UProjectileMovementComponent::bRotationFollowsVelocity:1;
	ptrMyProjectileComp->bIsHomingProjectile = true; 
	//uint8 UProjectileMovementComponent::bIsHomingProjectile:1;
	//如果为真，我们将加速朝向我们的归位目标。在弹道生成后必须设置 HomingTargetcomponent。

	ptrMyProjectileComp->ProjectileGravityScale = 1.5;
	//float UProjectileMovementComponent::ProjectileGravityScale;
	//为该弹道设置自定义重力比例。设为0表示无重力。
}

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

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

}

++

（194）

谢谢