如何在Ue4C++中使用UPawnMovementComponent而不是UFloatingPawnMovement来移

Question

我很难弄清楚如何使用UPawnMovementComponent而不是UFloatingPawnMovement来移动典当。每次我实现UPawnMovementComponent并点击播放时，编辑器都会崩溃。这是代码。

PlayerCharacter.h

// Fill out your copyright notice in the Description page of Project Settings.
#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "Camera/CameraComponent.h"
#include "GameFramework/SpringArmComponent.h"
#include "Components/CapsuleComponent.h"
#include "GameFramework/PawnMovementComponent.h"
#include "PlayerCharacter.generated.h"
UCLASS()
class LEARNING_API APlayerCharacter : public APawn
{
GENERATED_BODY()
public:
// Sets default values for this pawn's properties
APlayerCharacter();
UPROPERTY(EditAnywhere, Category = "Components")
UStaticMeshComponent* PlayerMesh;
UPROPERTY(EditAnywhere, Category = "Components")
UCameraComponent* Camera;
UPROPERTY(EditAnywhere, Category = "Components")
USpringArmComponent* CameraArm;
UPROPERTY(EditAnywhere, Category = "Components")
UCapsuleComponent* CapsuleComponent;
protected:
// Called when the game starts or when spawned
virtual void BeginPlay() override;
void MoveForward(float Amount);
void MoveRight(float Amount);
void Turn(float Amount);
void LookUp(float Amount);
PawnMovementComponent* PawnMovement;
public: 
// Called every frame
virtual void Tick(float DeltaTime) override;
// Called to bind functionality to input
virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;
};

PlayerCharacter.cpp

// Fill out your copyright notice in the Description page of Project Settings.

#include "PlayerCharacter.h"
// Sets default values
APlayerCharacter::APlayerCharacter()
{
// 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;
// Default to Player 0
AutoPossessPlayer = EAutoReceiveInput::Player0;
// Player Mesh and make it a root component
PlayerMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Player Mesh"));
RootComponent = PlayerMesh;
// Capsule Component
CapsuleComponent = CreateDefaultSubobject<UCapsuleComponent>(TEXT("Capsule Component"));
float capsule_radius = 40.f;
float capsule_height = 80.f;
CapsuleComponent->InitCapsuleSize(capsule_radius, capsule_height);
CapsuleComponent->SetupAttachment(RootComponent);
// Spring Arm Component
CameraArm = CreateDefaultSubobject<USpringArmComponent>(TEXT("Camera Arm"));
CameraArm->SetRelativeRotation(FRotator(0.f, 0.f, 0.f));
CameraArm->TargetArmLength = 500.f;
CameraArm->bEnableCameraLag = true;
CameraArm->CameraLagSpeed = 3.f;
CameraArm->SetupAttachment(RootComponent);
// Camera
Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("Camera Component"));
Camera->SetupAttachment(CameraArm, USpringArmComponent::SocketName);
// Player Movement Component
PawnMovement= CreateDefaultSubobject<UPawnMovementComponent>(TEXT("Pawn Movement"));
}
// Called when the game starts or when spawned
void APlayerCharacter::BeginPlay()
{
Super::BeginPlay();

}
// Called every frame
void APlayerCharacter::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
}
// Called to bind functionality to input
void APlayerCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
Super::SetupPlayerInputComponent(PlayerInputComponent);
PlayerInputComponent->BindAxis("MoveForward", this, &APlayerCharacter::MoveForward);
PlayerInputComponent->BindAxis("MoveRight", this, &APlayerCharacter::MoveRight);
PlayerInputComponent->BindAxis("Turn", this, &APlayerCharacter::Turn);
PlayerInputComponent->BindAxis("LookUp", this, &APlayerCharacter::LookUp);
}
void APlayerCharacter::MoveForward(float Amount)
{
PawnMovement->AddInputVector(GetActorForwardVector() * Amount);
}
void APlayerCharacter::MoveRight(float Amount)
{
PawnMovement->AddInputVector(GetActorRightVector() * Amount);
}
void APlayerCharacter::Turn(float Amount)
{
AddControllerYawInput(Amount);
}
void APlayerCharacter::LookUp(float Amount)
{
AddControllerPitchInput(Amount);
}

我之所以想实现UPawnMovementComponent而不是UFloatingPawnMovement，是因为我不想要在空中移动的浮动典当，我希望典当只在地面上移动。我认为UPawnMovementComponent将允许我这样做。就像我说的，每次我实现、编译和运行它时，编辑器都会崩溃。那么，有没有任何方法可以在编辑器不崩溃的情况下实现它呢。

Answer 1

不确定你是否解决过这个问题(这个问题很老(，但我认为你不能直接初始化UPawnMovementComponent，你需要导出自己的。如果查看类声明，可以看到UPawnMovementComponent被标记为UCLASS(abstract)。请参阅此处的声明

此外，如果在对PawnMovement进行任何调用之前尝试检查它是否不是nullptr，则可以防止崩溃。