UE5.5 C++ 增强输入快速上手

一.5.1以后直接模块自带了，所以直接包含头文件。我习惯先前置声明再包。

复制代码

//增强输入三件套
#include "InputActionValue.h" //输入映射Value值的头文件
#include "EnhancedInputComponent.h" //增强映射的头文件
#include "EnhancedInputSubsystems.h" //增强子系统的头文件

cpp 复制代码

class USpringArmComponent;
class UCameraComponent;
class UInputMappingContext;
class UInputAction;
struct FInputActionValue;

让后在引擎里，把绑定的Action 和键位上下文 .Action里设置ValueType,就是指定你的键输入，传值到函数是单float,还是二维输入，或者三维。

MappingContext 里设置这个，调用这个Action的键，这里是鼠标中建

二.这里直接做镜头拉近拉远。

首先声明，上面两个资源。

cpp 复制代码

class USpringArmComponent;
class UCameraComponent;
class UInputMappingContext;
class UInputAction;
struct FInputActionValue;

UCLASS()
class GIS_API ATestPawn : public APawn
{
	GENERATED_BODY()

public:
	// Sets default values for this pawn's properties
	ATestPawn();

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(VisibleAnywhere, BlueprintReadOnly, Category = MySceneComponent)
	USpringArmComponent* SpringArm;

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = MySceneComponent)
	UCameraComponent* Camera;

	UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "EnhancedInput", meta = (AllowPrivateAccess = "true"))
	TObjectPtr<UInputMappingContext> InputMappingContext;

	UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "EnhancedInput|Action", meta = (AllowPrivateAccess = "true"))
	TObjectPtr<UInputAction> IA_ZoomTest;

	void Zoom(const FInputActionValue& inputValue);
};

然后，绑定Zoom函数到Action上。参数要这么声明，值才能传对。

接着在开始绑定，把老版本InputComponent，转换增强输入子系统的，和它的组件EnhancedInputComponent。

cpp 复制代码

void ATestPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
	Super::SetupPlayerInputComponent(PlayerInputComponent); //

	// 先添加IMC还是绑定IA不重要，因为IMC代表的只是一个从按键到Action的关系，下面的Action是怎么到一个回调
	if (APlayerController* PC = CastChecked<APlayerController>(GetController()))
	{
		if (UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PC->GetLocalPlayer()))
		{
			Subsystem->AddMappingContext(InputMappingContext, 0);
		}
	}

	if (UEnhancedInputComponent* EnhancedInputComponent = CastChecked<UEnhancedInputComponent>(PlayerInputComponent))
	{
		if (IA_ZoomTest)
		{
			EnhancedInputComponent->BindAction(IA_ZoomTest, ETriggerEvent::Triggered, this, &ATestPawn::Zoom);
		}
	}
}

三.测试

完整CPP 如下

cpp 复制代码

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


#include "TestPawn.h"
#include "GameFramework/SpringArmComponent.h"
#include "Camera/CameraComponent.h"
//增强输入三件套
#include "InputActionValue.h" //输入映射Value值的头文件
#include "EnhancedInputComponent.h" //增强映射的头文件
#include "EnhancedInputSubsystems.h" //增强子系统的头文件


// Sets default values
ATestPawn::ATestPawn()
{
 	// 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;
	RootComponent = CreateDefaultSubobject<USceneComponent>("Root");
	SpringArm = CreateDefaultSubobject<USpringArmComponent>("SpringArm");
	Camera = CreateDefaultSubobject<UCameraComponent>("Camera");
	SpringArm->TargetArmLength = 300;
	SpringArm->bDoCollisionTest = false;
	SpringArm->SetupAttachment(RootComponent);
	Camera->SetupAttachment(SpringArm);

}

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

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

}

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

	// 先添加IMC还是绑定IA不重要，因为IMC代表的只是一个从按键到Action的关系，下面的Action是怎么到一个回调
	if (APlayerController* PC = CastChecked<APlayerController>(GetController()))
	{
		if (UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PC->GetLocalPlayer()))
		{
			Subsystem->AddMappingContext(InputMappingContext, 0);
		}
	}

	if (UEnhancedInputComponent* EnhancedInputComponent = CastChecked<UEnhancedInputComponent>(PlayerInputComponent))
	{
		if (IA_ZoomTest)
		{
			EnhancedInputComponent->BindAction(IA_ZoomTest, ETriggerEvent::Triggered, this, &ATestPawn::Zoom);
		}
	}
}

void ATestPawn::Zoom(const FInputActionValue& inputValue)
{
	float ZommValue = inputValue.Get<float>();
	SpringArm->TargetArmLength += ZommValue * 100;
}

用蓝图继承这个C++,并在编辑器里初始化，IMC 和 IA。即可

再放场景里，就可以镜头拉经，拉远了

UE5.5 C++ 增强输入 快速上手

UE5.5 C++ 增强输入快速上手