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Assets/Mirror/Examples/Room/Scripts/NetworkRoomManagerExt.cs

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+using UnityEngine;
+
+/*
+	Documentation: https://mirror-networking.gitbook.io/docs/components/network-manager
+	API Reference: https://mirror-networking.com/docs/api/Mirror.NetworkManager.html
+*/
+
+namespace Mirror.Examples.NetworkRoom
+{
+    [AddComponentMenu("")]
+    public class NetworkRoomManagerExt : NetworkRoomManager
+    {
+        [Header("Spawner Setup")]
+        [Tooltip("Reward Prefab for the Spawner")]
+        public GameObject rewardPrefab;
+        public byte poolSize = 10;
+
+        public static new NetworkRoomManagerExt singleton => NetworkManager.singleton as NetworkRoomManagerExt;
+
+        /// <summary>
+        /// This is called on the server when a networked scene finishes loading.
+        /// </summary>
+        /// <param name="sceneName">Name of the new scene.</param>
+        public override void OnRoomServerSceneChanged(string sceneName)
+        {
+            // spawn the initial batch of Rewards
+            if (sceneName == GameplayScene)
+            {
+                Spawner.InitializePool(rewardPrefab, poolSize);
+                Spawner.InitialSpawn();
+            }
+            else
+                Spawner.ClearPool();
+        }
+
+        public override void OnRoomClientSceneChanged()
+        {
+            // Don't initialize the pool for host client because it's
+            // already initialized in OnRoomServerSceneChanged
+            if (NetworkServer.active) return;
+
+            if (networkSceneName == GameplayScene)
+                Spawner.InitializePool(rewardPrefab, poolSize);
+            else
+                Spawner.ClearPool();
+        }
+
+        /// <summary>
+        /// Called just after GamePlayer object is instantiated and just before it replaces RoomPlayer object.
+        /// This is the ideal point to pass any data like player name, credentials, tokens, colors, etc.
+        /// into the GamePlayer object as it is about to enter the Online scene.
+        /// </summary>
+        /// <param name="roomPlayer"></param>
+        /// <param name="gamePlayer"></param>
+        /// <returns>true unless some code in here decides it needs to abort the replacement</returns>
+        public override bool OnRoomServerSceneLoadedForPlayer(NetworkConnectionToClient conn, GameObject roomPlayer, GameObject gamePlayer)
+        {
+            PlayerScore playerScore = gamePlayer.GetComponent<PlayerScore>();
+            playerScore.index = roomPlayer.GetComponent<NetworkRoomPlayer>().index;
+            return true;
+        }
+
+        public override void OnRoomStopClient()
+        {
+            base.OnRoomStopClient();
+        }
+
+        public override void OnRoomStopServer()
+        {
+            base.OnRoomStopServer();
+        }
+
+        /*
+            This code below is to demonstrate how to do a Start button that only appears for the Host player
+            showStartButton is a local bool that's needed because OnRoomServerPlayersReady is only fired when
+            all players are ready, but if a player cancels their ready state there's no callback to set it back to false
+            Therefore, allPlayersReady is used in combination with showStartButton to show/hide the Start button correctly.
+            Setting showStartButton false when the button is pressed hides it in the game scene since NetworkRoomManager
+            is set as DontDestroyOnLoad = true.
+        */
+
+        bool showStartButton;
+
+        public override void OnRoomServerPlayersReady()
+        {
+            // calling the base method calls ServerChangeScene as soon as all players are in Ready state.
+            if (Utils.IsHeadless())
+            {
+                base.OnRoomServerPlayersReady();
+            }
+            else
+            {
+                showStartButton = true;
+            }
+        }
+
+        public override void OnGUI()
+        {
+            base.OnGUI();
+
+            if (allPlayersReady && showStartButton && GUI.Button(new Rect(150, 300, 120, 20), "START GAME"))
+            {
+                // set to false to hide it in the game scene
+                showStartButton = false;
+
+                ServerChangeScene(GameplayScene);
+            }
+        }
+    }
+}