c++ - 在UE 4.18中将OnClicked监听器添加到AActor

我正在尝试向 Actor 添加事件侦听器，以便在游戏中单击 Actor 时可以执行某些任务。我尝试了多种方法，包括OnClicked.Add，OnClicked.AddDynamic以及在其他答案中看到的每种方法的多个版本，但最终都没有编译并给出类似的错误。

这是我目前的类(class)

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

#include "InterestItem1.h"


// Sets default values
AInterestItem1::AInterestItem1()
{
    // Set this actor to call Tick() every frame.  You can turn this off to
    improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;

}

// Called when the game starts or when spawned
void AInterestItem1::BeginPlay()
    {
    Super::BeginPlay();
    OnClicked.AddDynamic(this, AInterestItem1::moveToItem);

}

// Called every frame
void AInterestItem1::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

}

void AInterestItem1::moveToItem(UPrimitiveComponent* ClickedComp, FKey
ButtonPressed){
    UE_LOG(LogTemp, Log, TEXT("meh, they clicked me"));
}

与此有关，我在VS中收到以下错误
没有函数模板“FActorOnClickedSignature::__ Internal_AddDynamic”的实例与参数列表匹配

并在输出日志中出现此编译错误

CompilerResultsLog: Error: C:\Users\AtLink\Documents\Unreal Projects\Axis_Test_Purged\Source\Axis_Test_Purged\InterestItem1.cpp(18) : error C3867: 'AInterestItem1::moveToItem': non-standard syntax; use '&' to create a pointer to member
CompilerResultsLog: Error: C:\Users\AtLink\Documents\Unreal Projects\Axis_Test_Purged\Source\Axis_Test_Purged\InterestItem1.cpp(18) : error C2672: 'TBaseDynamicMulticastDelegate<FWeakObjectPtr,void,AActor *,FKey>::__Internal_AddDynamic': no matching overloaded function found
CompilerResultsLog: ERROR: UBT ERROR: Failed to produce item: C:\Users\AtLink\Documents\Unreal Projects\Axis_Test_Purged\Binaries\Win64\UE4Editor-Axis_Test_Purged-4805.dll

我是虚幻的新手，所以我可以对自己做错的事情做一些简单的解释。谢谢。

最佳答案

您的BeginPlay方法中出现错误

OnClicked.AddDynamic(this, AInterestItem1::moveToItem);

您应该创建一个指向member的指针，并将其传递给AddDynamic，如下所示:

OnClicked.AddDynamic(this, &AInterestItem1::moveToItem);

此错误还表明，没有使用您传递的参数的AddDynamic函数。

网络上有很多示例，例如:

AddDynamic example

我在自己的项目中也使用了此功能:

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

    USphereComponent* SphereComponent = CreateDefaultSubobject<USphereComponent>(TEXT("RootComponent"));
    RootComponent = SphereComponent;

    this->StaticMeshComponent = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("StaticMeshComponent"));
    this->StaticMeshComponent->SetupAttachment(RootComponent);

    OnClicked.AddDynamic(this, &AArea::SelectArea);
}

void AArea::SelectArea(AActor* TouchedActor, FKey ButtonPressed) {
    PlayerController->ChangeSelectedArea(this);
}

请确保在此处阅读有关委托(delegate)的文档:

Unreal Engine Delegates

希望能帮助到你 :)