藍圖接口和C++、Java中的接口類似，都是用來被繼承的，并且可以實現(xiàn)相應的功能。

使用UE新建一個第一人稱游戲來實現(xiàn)接口實例：TestInterface

2. 新建一個C++的接口類：HittedInterface

打開VS2019編輯C++代碼

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h" #include "UObject/Interface.h" #include "HittedInterface.generated.h"// This class does not need to be modified. /** class UHittedInterface 這個類是為了在UE中使用反射系統(tǒng)，不需要處理 */ UINTERFACE(MinimalAPI) class UHittedInterface : public UInterface {GENERATED_BODY() };/****/ class TESTINTERFACE_API IHittedInterface {GENERATED_BODY()// Add interface functions to this class. This is the class that will be inherited to implement this interface. public:/**BlueprintNativeEvent除了實現(xiàn)C++調用藍圖外，同樣會調用一個本地方法，本地方法的實現(xiàn)為 聲明的函數(shù)名+_Implementation在實現(xiàn)中應該是：void hitByProjectile_Implementation()override；這樣就可以實現(xiàn)一次調用，兩個實現(xiàn)（c++實現(xiàn)，藍圖實現(xiàn)）*/UFUNCTION(BlueprintNativeEvent, BlueprintCallable)void hitByProjectile(); }; // Fill out your copyright notice in the Description page of Project Settings. #include "HittedInterface.h" // Add default functionality here for any IHittedInterface functions that are not pure virtual.

新建一個Actord類HittedActor繼承自接口IHittedInterface

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h" #include "HittedInterface.h" #include "GameFramework/Actor.h" #include "HittedActor.generated.h"UCLASS() class TESTINTERFACE_API AHittedActor : public AActor, public IHittedInterface {GENERATED_BODY()public:// Sets default values for this actor's propertiesAHittedActor();protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:// Called every framevirtual void Tick(float DeltaTime) override;public:void hitByProjectile_Implementation()override;}; // Fill out your copyright notice in the Description page of Project Settings.#include "HittedActor.h" #include "Kismet/KismetSystemLibrary.h"// Sets default values AHittedActor::AHittedActor() {// 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 AHittedActor::BeginPlay() {Super::BeginPlay();}// Called every frame void AHittedActor::Tick(float DeltaTime) {Super::Tick(DeltaTime);}void AHittedActor::hitByProjectile_Implementation() {//在HUD界面顯示內容GEngine->AddOnScreenDebugMessage(-1, 2.0, FColor::Red, UKismetSystemLibrary::GetDisplayName(this) + TEXT(" hitting...")); }

在子彈擊中后調用這個函數(shù)，在類ATestInterfaceProjectile中實現(xiàn)

void ATestInterfaceProjectile::OnHit(UPrimitiveComponent* HitComp, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit) {//Actor被子彈擊中后，調用接口IHittedInterface* hitedActor = Cast<IHittedInterface>(OtherActor);if (hitedActor) {hitedActor->Execute_hitByProjectile(OtherActor);}// Only add impulse and destroy projectile if we hit a physicsif ((OtherActor != nullptr) && (OtherActor != this) && (OtherComp != nullptr) && OtherComp->IsSimulatingPhysics()) {OtherComp->AddImpulseAtLocation(GetVelocity() * 100.0f, GetActorLocation());Destroy();} }

在UEEditor 中創(chuàng)建AHittedActor的藍圖類BP_HittedActor

在藍圖中添加一個立方體

保存以后，把BP_HittedActor拖動到場景中

可以在跑【類設置】中查看接口繼承情況

運行程序

aaa

總結

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