UE5 C++（十三）— 创建Character，添加增强输入

本文介绍: 最后，拖到场景中，把WorldSetting -> Game Mode 设置为null。最后，可以编译一下，看看输入模块（“EnhancedInput” ）是否引入成功。在DEMO.Build.cs 脚本中添加增强输入模块。这时候会有默认组件，缺少人物模型，我们可以在这里添加。编译之后，创建蓝图类BP_MyCharacter。点击运行，就可以实现鼠标，键盘第三人称操作了。有个容易出错的点，这里的设置一定要正确。创建MyCharacter C++类。然后添加引用到C++头文件中。首先，是头文件添加引用。

创建MyCharacter C++类
在这里插入图片描述

在DEMO.Build.cs 脚本中添加增强输入模块
在这里插入图片描述
有个容易出错的点，这里的设置一定要正确

然后添加引用到C++头文件中

#include "InputActionValue.h"
#include "EnhancedInputComponent.h"
#include "EnhancedInputSubsystems.h"

最后，可以编译一下，看看输入模块（“EnhancedInput” ）是否引入成功。

首先，是头文件添加引用
MyCharacter.h

#pragma once

#include "CoreMinimal.h"
#include "InputActionValue.h"
#include "EnhancedInputComponent.h"
#include "EnhancedInputSubsystems.h"
#include "GameFramework/Controller.h"
#include "GameFramework/SpringArmComponent.h"
#include "Camera/CameraComponent.h"
#include "GameFramework/CharacterMovementComponent.h"
#include "GameFramework/Character.h"
#include "MyCharacter.generated.h"

UCLASS()
class DEMO_API AMyCharacter : public ACharacter
{
	GENERATED_BODY()

public:
	// Sets default values for this character's properties
	AMyCharacter();

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

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

	// Called to bind functionality to input
	virtual void SetupPlayerInputComponent(class UInputComponent *PlayerInputComponent) override;

	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "MySceneComponent")
		USpringArmComponent *MySpringArm;
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "MySceneComponent")
		UCameraComponent *MyCamera;
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Input")
		class UInputMappingContext *DefaultMappingContext;
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Input")
		class UInputAction* MoveAction;
	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "Input")
		class UInputAction* LookAction;

	void Move(const FInputActionValue& Value);
	void Look(const FInputActionValue& Value);
};

然后在MyCharacter.cpp中实现

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

#include "MyCharacter.h"

// Sets default values
AMyCharacter::AMyCharacter()
{
	// Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;
	MySpringArm = CreateDefaultSubobject<USpringArmComponent>(TEXT("MySpringArm"));
	MyCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("MyCamera"));
	MySpringArm->SetupAttachment(RootComponent);
	MyCamera->SetupAttachment(MySpringArm);
	MySpringArm->TargetArmLength = 300.0f;
	// 这么设置是为了让控制器的转动不影响角色的转动，只影响摄像机的转动
	bUseControllerRotationYaw = false;
	bUseControllerRotationPitch = false;
	bUseControllerRotationRoll = false;
	// 为了让角色的移动方向与摄像机的方向一致，需要设置以下参数
	GetCharacterMovement()->bOrientRotationToMovement = true;
	// 这是为了使用Pawn的控制器旋转
	MySpringArm->bUsePawnControlRotation = true;
}

// Called when the game starts or when spawned
void AMyCharacter::BeginPlay()
{
	Super::BeginPlay();
	APlayerController *PlayerController = Cast<APlayerController>(GetController());
	if (PlayerController)
	{
		UEnhancedInputLocalPlayerSubsystem *LocalPlayerSubsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PlayerController->GetLocalPlayer());
		if (LocalPlayerSubsystem)
		{
			LocalPlayerSubsystem->AddMappingContext(DefaultMappingContext, 0);
		}
	}
}

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

// Called to bind functionality to input
void AMyCharacter::SetupPlayerInputComponent(UInputComponent *PlayerInputComponent)
{
	Super::SetupPlayerInputComponent(PlayerInputComponent);

	if (UEnhancedInputComponent *EnhancedInputComponent = CastChecked<UEnhancedInputComponent>(PlayerInputComponent))
	{
		EnhancedInputComponent->BindAction(MoveAction, ETriggerEvent::Triggered, this, &AMyCharacter::Move);
		EnhancedInputComponent->BindAction(LookAction, ETriggerEvent::Triggered, this, &AMyCharacter::Look);
	}
}

void AMyCharacter::Move(const FInputActionValue &Value)
{
	FVector2D MoveVector = Value.Get<FVector2D>();
	if (Controller != nullptr)
	{
		const FRotator Rotation = Controller->GetControlRotation();
		const FRotator YawRotation(0, Rotation.Yaw, 0);
		const FVector ForwardDirection = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X);
		const FVector RightDirection = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::Y);
		AddMovementInput(ForwardDirection, MoveVector.Y);
		AddMovementInput(RightDirection, MoveVector.X);
	}
}

void AMyCharacter::Look(const FInputActionValue &Value)
{
	FVector2D LookVector = Value.Get<FVector2D>();
	if (Controller == nullptr)
	{
		return;
	}
	AddControllerYawInput(LookVector.X);
	AddControllerPitchInput(LookVector.Y);
}