ue4 杂记

c++获取GameMode

 if(GetWorld()) {
   auto gamemode = (ASomeGameMode*)GetWorld()->GetAuthGameMode();
 }

或者

ASomeGameMode* gm = (ASomeGameMode*)GetWorld()->GetAuthGameMode();

获取所有actors

https://answers.unrealengine.com/questions/289453/get-all-actors-of-class-in-c.html

获取controller

UGameplayStatics::GetPlayerController(GetWorld(), 0);

或者

GetWorld()->GetFirstPlayerController()

切换level

 void ACodeLevelChangeCharacter::SwapLevel()
 {
     UWorld* TheWorld = GetWorld();

     FString CurrentLevel = TheWorld->GetMapName();

     if (CurrentLevel == "ThirdPersonExampleMap")
     {
         UGameplayStatics::OpenLevel(GetWorld(), "Level2");
     }
     else
     {
         UGameplayStatics::OpenLevel(GetWorld(), "ThirdPersonExampleMap");
     }
 }

查找object，actor

for ( TObjectIterator<USkeletalMeshComponent> Itr; Itr; ++Itr )
{
	// Access the subclass instance with the * or -> operators.
	USkeletalMeshComponent *Component = *Itr;
	ClientMessage(Itr->GetName());
}

for (TActorIterator<AStaticMeshActor> ActorItr(GetWorld()); ActorItr; ++ActorItr)
{
	// Same as with the Object Iterator, access the subclass instance with the * or -> operators.
	AStaticMeshActor *Mesh = *ActorItr;
	ClientMessage(ActorItr->GetName());
	ClientMessage(ActorItr->GetActorLocation().ToString());
}

Unreal中的构造函数，只在生成到场景中的时候执行，启动游戏是不会执行构造函数的

对于不是主Controller绑定的actor，想要获取输入的方法