虚幻5.1 UUserWidget不再包含OnLevelRemovedFromWorld

转而使用NativeDestruct()

// virtual void OnLevelRemovedFromWorld(ULevel* InLevel, UWorld* InWorld);

virtual void NativeDestruct() override;

/*void UMenu::OnLevelRemovedFromWorld(ULevel* InLevel, UWorld* InWorld)

{

    MenuTearDown();

    Super::OnLevelRemovedFromWorld(InLevel, InWorld);

}*/

void UMenu::NativeDestruct()

{

    MenuTearDown();

    Super::NativeDestruct();

}