UE4使用委托实现Actor之间的通信

在场景中获取某一种类型的Actor,并且调用Actor中的成员函数,使用函数：UGameplayStatics::GetAllActorsOfClass

 TSubclassOf<AActor> worldClassObject = ARotatingActor::StaticClass();TArray<AActor*>actorOfClass;UGameplayStatics::GetAllActorsOfClass(this, worldClassObject, actorOfClass);for (AActor* actor : actorOfClass){ARotatingActor* rotatingActor = Cast<ARotatingActor>(actor);if (rotatingActor){rotatingActor->ToggleRotate();}}

委托

//静态绑定
DECLARE_DELEGATE(FRotateDelegate);//动态绑定
/**
* _RetVal ：表示绑定的函数具有返回值
* _OneParam： 表示绑定的函数有一个参数
* 第一个惨数float: 函数返回值的类型
* 第二个参数FDynamicRotateDelegate ：委托的名称
* 第三个参数：函数的参数
* 第四个参数：函数参数的名称
*/
DECLARE_DYNAMIC_DELEGATE_RetVal_OneParam(float, FDynamicRotateDelegate, float, RotationSpeed);

//声明代理FRotateDelegate RotateDelegate;FDynamicRotateDelegate DynamicRotatedelegate;

//调用
RotateDelegate.ExecuteIfBound();
float PreviousRotationRate = DynamicRotatedelegate.Execute(Rate);

//委托调用接口APawn* Pawn = UGameplayStatics::GetPlayerPawn(this, 0);AFirstPawn* firstPawn = Cast<AFirstPawn>(Pawn);if (firstPawn) {firstPawn->RotateDelegate.BindUObject(this, &ARotatingActor::ToggleRotate);firstPawn->DynamicRotatedelegate.BindDynamic(this, &ARotatingActor::SetRotationRate);}

完整代码：

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "FirstPawn.generated.h"//静态绑定
DECLARE_DELEGATE(FRotateDelegate);//动态绑定
/**
* _RetVal ：表示绑定的函数具有返回值
* _OneParam： 表示绑定的函数有一个参数
* 第一个惨数float: 函数返回值的类型
* 第二个参数FDynamicRotateDelegate ：委托的名称
* 第三个参数：函数的参数
* 第四个参数：函数参数的名称
*/
DECLARE_DYNAMIC_DELEGATE_RetVal_OneParam(float, FDynamicRotateDelegate, float, RotationSpeed);UCLASS()
class TRACELENGTH_API AFirstPawn : public APawn
{GENERATED_BODY()public:// Sets default values for this pawn's propertiesAFirstPawn();/**Mesh component to give the Pawn a visual representation in the world*/UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))class UStaticMeshComponent* MeshComponent;/** Camera boom positioning the camera behind the Pawn */UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category=  Camera, meta = (AllowPrivateAccess = "true"))class USpringArmComponent* CameraBoom;/** Follow camera */UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category= Camera, meta = (AllowPrivateAccess = "true"))class UCameraComponent* FollowCamera;//移动速度UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "Movement")float moveSpeed = 20.0;//移动方向UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Movement")FVector direction = FVector(0.0);UFUNCTION(BlueprintCallable)void ToggleAllRotators();//声明代理FRotateDelegate RotateDelegate;FDynamicRotateDelegate DynamicRotatedelegate;UPROPERTY(EditAnywhere, BlueprintReadWrite)float RotatingActorRotate = 180.f;UFUNCTION(BlueprintCallable) void SetRotatingActorRates(float Rate);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;private:void moveForward(float value);void moveRight(float value);void moveUp(float value);void lineTraceSingleByChannel();void lineTraceMultiByChannel();void boxTraceSingleForObjects();
};

// Fill out your copyright notice in the Description page of Project Settings.#include "FirstPawn.h"
#include "GameFramework\SpringArmComponent.h"
#include "DrawDebugHelpers.h"
#include "Camera\CameraComponent.h"
#include "TraceLength.h"
#include "Kismet\KismetSystemLibrary.h"
#include "RotatingActor.h"
#include "Kismet/GameplayStatics.h"// Sets default values
AFirstPawn::AFirstPawn() {// 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;MeshComponent = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MeshComponent"));SetRootComponent(Cast<USceneComponent>(MeshComponent));CameraBoom = CreateDefaultSubobject<USpringArmComponent>(TEXT("CameraBoom"));CameraBoom->SetupAttachment(RootComponent);FollowCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("FollowCamera"));FollowCamera->SetupAttachment(CameraBoom, USpringArmComponent::SocketName);
}void AFirstPawn::ToggleAllRotators() {RotateDelegate.ExecuteIfBound();
}void AFirstPawn::SetRotatingActorRates(float Rate) {float PreviousRotationRate = DynamicRotatedelegate.Execute(Rate); printf("Previous Rotation Rate : %f", PreviousRotationRate);
}// Called when the game starts or when spawned
void AFirstPawn::BeginPlay() {Super::BeginPlay();
}// Called every frame
void AFirstPawn::Tick(float DeltaTime) {Super::Tick(DeltaTime);FVector location = GetActorLocation();FVector detailLocation =  direction;detailLocation.Normalize();detailLocation *= moveSpeed;location += detailLocation;SetActorLocation(location);lineTraceSingleByChannel();
}// Called to bind functionality to input
void AFirstPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent) {Super::SetupPlayerInputComponent(PlayerInputComponent);check(PlayerInputComponent);PlayerInputComponent->BindAxis("MoveForward", this, &AFirstPawn::moveForward);PlayerInputComponent->BindAxis("MoveRight", this, &AFirstPawn::moveRight);PlayerInputComponent->BindAxis("MoveUp", this, &AFirstPawn::moveUp);
}void AFirstPawn::moveForward(float value) {//UE_LOG(LogTemp, Warning, TEXT("moveForward:%f"), value);direction.X = value;}void AFirstPawn::moveRight(float value) {//UE_LOG(LogTemp, Warning, TEXT("moveRight: %f"), value);direction.Y = value;
}void AFirstPawn::moveUp(float value) {direction.Z = value;
}void AFirstPawn::lineTraceSingleByChannel() {FHitResult HitResult;FVector Start = GetActorLocation() /*+ FVector(0.f, 0.f, 75.f)*/;FVector End = Start + GetActorForwardVector() * 500.f;FCollisionQueryParams CollisionQueryParams;CollisionQueryParams.AddIgnoredActor(this);GetWorld()->LineTraceSingleByChannel(HitResult, Start, End, ECollisionChannel::ECC_Visibility, CollisionQueryParams);if (HitResult.bBlockingHit) {//DrawDebugSphere(GetWorld(), HitResult.Location, 15.f, 12, FColor::Red, false, 5.f);//DrawDebugLine(GetWorld(), Start, HitResult.Location, FColor::Red, true, 3.f);DrawDebugPoint(GetWorld(), HitResult.Location, 5.f, FColor::Blue, false, 5.f);}
}
}

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "RotatingActor.generated.h"UCLASS()
class TRACELENGTH_API ARotatingActor : public AActor {GENERATED_BODY()public:// Sets default values for this actor's propertiesARotatingActor();UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category    = "Item|Mesh") classUStaticMeshComponent* Mesh;//控制旋转UPROPERTY(EditAnywhere, BlueprintReadWrite, Category ="Item|ItemProperties")bool bRotate = false;//旋转角度UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Item|ItemProperties")float RotationRate = 45.0;UFUNCTION()float SetRotationRate(float Rate);protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:// Called every framevirtual void Tick(float DeltaTime) override;void ToggleRotate();
};

// Fill out your copyright notice in the Description page of Project Settings.#include "RotatingActor.h"
#include "FirstPawn.h"
#include "Kismet/GameplayStatics.h"// Sets default values
ARotatingActor::ARotatingActor() {// 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;Mesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Mesh"));RootComponent = Cast<USceneComponent>(Mesh);
}float ARotatingActor::SetRotationRate(float Rate) {float Temp = RotationRate;RotationRate = Rate;return Temp;
}// Called when the game starts or when spawned
void ARotatingActor::BeginPlay() {Super::BeginPlay();APawn* Pawn = UGameplayStatics::GetPlayerPawn(this, 0);AFirstPawn* firstPawn = Cast<AFirstPawn>(Pawn);if (firstPawn) {firstPawn->RotateDelegate.BindUObject(this, &ARotatingActor::ToggleRotate);firstPawn->DynamicRotatedelegate.BindDynamic(this, &ARotatingActor::SetRotationRate);}
}// Called every frame
void ARotatingActor::Tick(float DeltaTime) {Super::Tick(DeltaTime);if (bRotate) {FRotator Rotation = GetActorRotation();Rotation.Yaw += DeltaTime * RotationRate;SetActorRotation(Rotation);}
}void ARotatingActor::ToggleRotate() {bRotate = !bRotate;
}

BP_FirstPawn

aaa

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