About AActor!!! "UObject" has no member "BeginPlay"

AActor

An AActor is an object that is meant to be part of the gameplay experience. AActors are either placed in a level by a designer or created at runtime via gameplay systems. All objects that can be placed into a level extend from this class. Examples include AStaticMeshActor, ACameraActor, and APointLight actors. AActor derives from UObject, so enjoys all of the standard features listed in the previous section. AActors can be explicitly destroyed via gameplay code (C++ or Blueprints) or via the standard garbage collection mechanism when the owning level is unloaded from memory. AActors are responsible for the high-level behaviors of your game’s objects. AActors are also the base type that can be replicated during networking. During network replication, AActors can also distribute information for any UActorComponents owned by that AActor that require network support.

AActors have their own behaviors (specialization through inheritance), but they also act as containers for a hierarchy of UActorComponents (specialization through composition). This is done through the AActor’s RootComponent member, which contains a single UActorComponent that, in turn, can contain many others. Before an AActor can be placed in a level, that AActor must contain at least a USceneComponent which contains the translation, rotation, and scale for that AActor.

AActors have a series of events that are called during the lifecycle of the AActor. The list below is a simplified set of the events that illustrate the lifecycle.

•BeginPlay - called when the object first comes into gameplay existence

•Tick - called once per frame to do work over time

•EndPlay - called when the object is leaving the gameplay space

See Actors for a more detailed discussion on AActor.