C++和蓝图混用事件

news2024/11/15 11:32:54

一、在C++中创建动态多播委托
1、UEBpAndCpp_Sender.h

	//声明一个蓝图可调用的多播委托的类型
	DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FUEBpAndCpp_Broadcast, int, Param);
	//创建对象
	UPROPERTY(BlueprintAssignable)
	FUEBpAndCpp_Broadcast UEBpAndCpp_Broadcast;

注意：相比纯C++多播委托，宏名字多了DYNAMIC单词

2、UEBpAndCpp_Sender.cpp

	//广播
	UEBpAndCpp_Broadcast.Broadcast(FMath::RandRange(0, 100));

二、在C++中订阅、取消订阅动态多播委托
1、UEBpAndCpp_Receiver_G.h

#include "UEBpAndCpp_Receiver_Parent.h"

protected:
	virtual void BeginPlay() override;

public:
	UFUNCTION()
	void OnReceived(int Param);

注意：一定要加UFUNCTION

2、UEBpAndCpp_Receiver_G.cpp

#include "UEBpAndCpp_Receiver_G.h"
#include "UEBpAndCpp_Sender.h"
#include "Engine/Engine.h"
#include "Kismet/GameplayStatics.h"

void AUEBpAndCpp_Receiver_G::BeginPlay()
{
	Super::BeginPlay();
	//订阅动态多播委托
	AUEBpAndCpp_Sender* PlayerPawn = Cast<AUEBpAndCpp_Sender>(UGameplayStatics::GetPlayerPawn(this, 0));
	PlayerPawn->UEBpAndCpp_Broadcast.AddDynamic(this, &AUEBpAndCpp_Receiver_G::OnReceived);
	//取消订阅动态多播委托
	PlayerPawn->UEBpAndCpp_Broadcast.RemoveDynamic(this, &AUEBpAndCpp_Receiver_G::OnReceived);
}

void AUEBpAndCpp_Receiver_G::OnReceived(int Param)
{
	GEngine->AddOnScreenDebugMessage(INDEX_NONE, 10.0f, FColor::Green, FString::Printf(TEXT("%i"), Param));
}