[object Object]

1. 在子弹类里面编写一个OnProjectileImpact函数用作回调函数

   void AMyProjectile::OnProjectileImpact(UPrimitiveComponent* HitComponent, AActor* OtherActor,
                                          UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit)
   {
   	if (OtherActor)
   	{
   		UGameplayStatics::ApplyPointDamage(OtherActor, Damage, NormalImpulse, Hit, GetInstigator()->Controller, this,
   		                                   DamageType);//施加伤害的函数是UE自己实现的, 我们只需要调用
                                              //后续会提到这个函数的调用逻辑
   	}
   
   	Destroy();
   }

2. 在子弹类的构造函数里面绑定上述回调函数, 需要注意的是 只有服务端可以运行这段逻辑 因此需要检查一下

   if (GetLocalRole() == ROLE_Authority)
   	{
   		SphereComponent->OnComponentHit.AddDynamic(this, &ThisClass::OnProjectileImpact);
   	}

   这样当子弹被碰撞的时候就可以调用这个回调函数了

3. 看UE源码UGameplayStatics::ApplyPointDamage 可以发现return DamagedActor->TakeDamage(BaseDamage, PointDamageEvent, EventInstigator, DamageCauser); 这一行 也就是说这个代码的伤害实现是基于DamagedActor对象的TakeDamage方法 我们去人物类那边

   float Amutiplayer_demoCharacter::TakeDamage(float DamageTaken, FDamageEvent const& DamageEvent,
                                               AController* EventInstigator, AActor* DamageCauser)
   {
   	float damageApplied = CurrentHealth - DamageTaken;
   	//need a lock here, or network-sync not insurance if float calc slower that network latency and client CPU disorder execute.
   	SetCurrentHealth(damageApplied);
   	return damageApplied;
   }

   这个方法在父类里面UE已经提供了虚接口, 我们需要重写, 如果不考虑防御值等效果, 我们直接setHealth就可以了

整个代码合起来,调用图如下: StartFire()->HandleFire()->RFC: HandleFire_Implementation()->GetWorld()->SpawnActor<AMyProjectile>->AMyProjectile constructor set bReplicates true ->collision happen->OnProjectileImpact()->ApplyPointDamage()->DamagedActor->AActor::TakeDamage()->virtual->Amutiplayer_demoCharacter::TakeDamage()