新建MyPawn C++类

.h

#include "GameFramework/SpringArmComponent.h"	//SpringArm组件
#include "Camera/CameraComponent.h"	//Camera组件

class 工程名称_API AMyPawn : public APawn
{
//定义组件变量
public:
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MySceneComponent");
		USceneComponent* MyRoot;
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MySceneComponent");
		USpringArmComponent* MySpringArm;
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "MySceneComponent");
		UCameraComponent* MyCamera;
}

.cpp

AMyPawn::AMyPawn()
{
 	// Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	//初始化组件变量的值
	MyRoot = CreateDefaultSubobject<USceneComponent>(TEXT("MyRoot"));
	MySpringArm = CreateDefaultSubobject<USpringArmComponent>(TEXT("MySprintArm"));
	MyCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("MyCamera"));

	//设置父子层级关系
	RootComponent = MyRoot;
	MySpringArm->SetupAttachment(MyRoot);
	MyCamera->SetupAttachment(MySpringArm);
	MySpringArm->bDoCollisionTest = false;	//关闭DoCollisionTest
}

void AMyPawn::BeginPlay()
{
	Super::BeginPlay();

	//设置MyPawn的Transform
	FVector MyLocation = FVector(0,0,0);
	FRotator MyRotation = FRotator(-50,0,0);
	FVector MyScale = FVector(1,1,1);
	SetActorLocation(MyLocation);
	SetActorRotation(MyRotation);
	SetActorScale3D(MyScale);
}

运行后