如何在 Unity 中将画布与 Photon Engine 同步

Question

I'm trying to synchronize a canvas with photon engine so every player can see it. This canvas will be kind of a tv that any player can turn on and the rest can watch it. I could synchronized a cube adding the PhotonView and the PhotonRigidBody components to the prefab but when I tried the same with the canvas it didn't work at all. Can anyone tell me what components are required to do this and if it needed it what should I handle with an extra script (ie transfer ownership).

Answer 1

There is nothing special about the canvas, but it could be locked in place.

There are two solutions I have for you:

Observable Component :

You could write a custom observable component, and add it to the PhotonView:

To make use of this function, the script has to implement the IPunObservable interface.

public class CustomObservable : MonoBehaviourPunCallbacks, IPunObservable
{
    [SerializeField] PlayerController playerController;

    public void OnPhotonSerializeView(PhotonStream stream, PhotonMessageInfo info)
    {
        if (stream.IsWriting)
        {
            stream.SendNext(playerController.playerNumber);
            stream.SendNext(playerController.playerScore);
        }
        else
        {
            playerController.playerNumber = (int)stream.ReceiveNext();
            playerController.playerScore = (float)stream.ReceiveNext();
        }
    }
}

Custom Properties :

You could also use custom properties to sync the data across all players.

Photon's Custom Properties consist of a key-values Hashtable which you can fill on demand. The values are synced and cached on the clients, so you don't have to fetch them before use. Changes are pushed to the others by SetCustomProperties().

How is this useful? Typically, rooms and players have some attributes that are not related to a GameObject: The current map or the color of a player's character (think: 2d jump and run). Those can be sent via Object Synchronization or RPC, but it is often more convenient to use Custom Properties.

PhotonNetwork.CurrentRoom.SetCustomProperties(Hashtable propsToSet)

You can write a script that uses Photons callback, and updated the UI elements.

OnRoomPropertiesUpdate(Hashtable propertiesThatChanged)