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UE5.5 C++ 增强输入快速上手

ai 2025/8/25 8:24:37

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。

//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

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。

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 propertiesATestPawn();protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:	// Called every framevirtual void Tick(float DeltaTime) override;// Called to bind functionality to inputvirtual 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。

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

// 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