Updated Basic Example

Assets/Mirror/Examples/Basic/Prefabs/Player.prefab

@@ -26,7 +26,7 @@ Transform:
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 897184729387425976}
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 562, y: 368, z: 0}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 0}
@@ -46,7 +46,8 @@ MonoBehaviour:
   m_EditorClassIdentifier: 
   sceneId: 0
   serverOnly: 0
-  m_AssetId: 
+  visible: 0
+  m_AssetId: dc2c4328591bef748abb8df795c17202
   hasSpawned: 0
 --- !u!114 &8550999602067651493
 MonoBehaviour:

Assets/Mirror/Examples/Basic/Scenes/Example.unity

@@ -176,6 +176,8 @@ MonoBehaviour:
   SendWindowSize: 4096
   ReceiveWindowSize: 4096
   NonAlloc: 0
+  ReliableMaxMessageSize: 4811624
+  UnreliableMaxMessageSize: 1199
   debugLog: 0
   statisticsGUI: 0
   statisticsLog: 0
@@ -192,7 +194,6 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   dontDestroyOnLoad: 0
-  PersistNetworkManagerToOfflineScene: 0
   runInBackground: 1
   autoStartServerBuild: 1
   serverTickRate: 30
@@ -207,8 +208,6 @@ MonoBehaviour:
   autoCreatePlayer: 1
   playerSpawnMethod: 1
   spawnPrefabs: []
-  mainPanel: {fileID: 1712119861}
-  playersPanel: {fileID: 379082679}
 --- !u!4 &249891957
 Transform:
   m_ObjectHideFlags: 0
@@ -421,6 +420,7 @@ GameObject:
   - component: {fileID: 533055204}
   - component: {fileID: 533055203}
   - component: {fileID: 533055202}
+  - component: {fileID: 533055201}
   m_Layer: 5
   m_Name: Canvas
   m_TagString: Untagged
@@ -428,6 +428,20 @@ GameObject:
   m_NavMeshLayer: 0
   m_StaticEditorFlags: 0
   m_IsActive: 1
+--- !u!114 &533055201
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 533055200}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 266fac335be17a243af86e88de84766d, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  mainPanel: {fileID: 1712119861}
+  playersPanel: {fileID: 379082679}
 --- !u!114 &533055202
 MonoBehaviour:
   m_ObjectHideFlags: 0

Assets/Mirror/Examples/Basic/Scripts/BasicNetManager.cs

@@ -10,14 +10,6 @@ namespace Mirror.Examples.Basic
     [AddComponentMenu("")]
     public class BasicNetManager : NetworkManager
     {
-        [Header("Canvas UI")]
-
-        [Tooltip("Assign Main Panel so it can be turned on from Player:OnStartClient")]
-        public RectTransform mainPanel;
-
-        [Tooltip("Assign Players Panel for instantiating PlayerUI as child")]
-        public RectTransform playersPanel;
-
         /// <summary>
         /// Called on the server when a client adds a new player with NetworkClient.AddPlayer.
         /// <para>The default implementation for this function creates a new player object from the playerPrefab.</para>
@@ -39,6 +31,5 @@ public override void OnServerDisconnect(NetworkConnection conn)
             base.OnServerDisconnect(conn);
             Player.ResetPlayerNumbers();
         }
-
     }
 }

Assets/Mirror/Examples/Basic/Scripts/CanvasUI.cs

@@ -0,0 +1,18 @@
+using UnityEngine;
+
+public class CanvasUI : MonoBehaviour
+{
+    [Tooltip("Assign Main Panel so it can be turned on from Player:OnStartClient")]
+    public RectTransform mainPanel;
+
+    [Tooltip("Assign Players Panel for instantiating PlayerUI as child")]
+    public RectTransform playersPanel;
+
+    // static instance that can be referenced directly from Player script
+    public static CanvasUI instance;
+
+    void Awake()
+    {
+        instance = this;
+    }
+}

Assets/Mirror/Examples/Basic/Scripts/CanvasUI.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 266fac335be17a243af86e88de84766d
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Mirror/Examples/Basic/Scripts/Player.cs

@@ -5,7 +5,7 @@ namespace Mirror.Examples.Basic
 {
     public class Player : NetworkBehaviour
     {
-        // Events that the UI will subscribe to
+        // Events that the PlayerUI will subscribe to
         public event System.Action<int> OnPlayerNumberChanged;
         public event System.Action<Color32> OnPlayerColorChanged;
         public event System.Action<int> OnPlayerDataChanged;
@@ -13,17 +13,12 @@ public class Player : NetworkBehaviour
         // Players List to manage playerNumber
         static readonly List<Player> playersList = new List<Player>();
 
-        internal static void ResetPlayerNumbers()
-        {
-            int playerNumber = 0;
-            foreach (Player player in playersList)
-                player.playerNumber = playerNumber++;
-        }
-
         [Header("Player UI")]
         public GameObject playerUIPrefab;
         GameObject playerUI;
 
+        #region SyncVars
+
         [Header("SyncVars")]
 
         /// <summary>
@@ -62,6 +57,10 @@ void PlayerColorChanged(Color32 _, Color32 newPlayerColor)
             OnPlayerColorChanged?.Invoke(newPlayerColor);
         }
 
+        #endregion
+
+        #region Server
+
         /// <summary>
         /// This is invoked for NetworkBehaviour objects when they become active on the server.
         /// <para>This could be triggered by NetworkServer.Listen() for objects in the scene, or by NetworkServer.Spawn() for objects that are dynamically created.</para>
@@ -81,14 +80,14 @@ public override void OnStartServer()
             InvokeRepeating(nameof(UpdateData), 1, 1);
         }
 
-        /// <summary>
-        /// Invoked on the server when the object is unspawned
-        /// <para>Useful for saving object data in persistent storage</para>
-        /// </summary>
-        public override void OnStopServer()
+        // This is called from BasicNetManager OnServerAddPlayer and OnServerDisconnect
+        // Player numbers are reset whenever a player joins / leaves
+        [ServerCallback]
+        internal static void ResetPlayerNumbers()
         {
-            CancelInvoke();
-            playersList.Remove(this);
+            int playerNumber = 0;
+            foreach (Player player in playersList)
+                player.playerNumber = playerNumber++;
         }
 
         // This only runs on the server, called from OnStartServer via InvokeRepeating
@@ -98,17 +97,38 @@ void UpdateData()
             playerData = Random.Range(100, 1000);
         }
 
+        /// <summary>
+        /// Invoked on the server when the object is unspawned
+        /// <para>Useful for saving object data in persistent storage</para>
+        /// </summary>
+        public override void OnStopServer()
+        {
+            CancelInvoke();
+            playersList.Remove(this);
+        }
+
+        #endregion
+
+        #region Client
+
+        /// <summary>
+        /// Called when the local player object has been set up.
+        /// <para>This happens after OnStartClient(), as it is triggered by an ownership message from the server. This is an appropriate place to activate components or functionality that should only be active for the local player, such as cameras and input.</para>
+        /// </summary>
+        public override void OnStartLocalPlayer()
+        {
+            // Activate the main panel
+            CanvasUI.instance.mainPanel.gameObject.SetActive(true);
+        }
+
         /// <summary>
         /// Called on every NetworkBehaviour when it is activated on a client.
         /// <para>Objects on the host have this function called, as there is a local client on the host. The values of SyncVars on object are guaranteed to be initialized correctly with the latest state from the server when this function is called on the client.</para>
         /// </summary>
         public override void OnStartClient()
         {
-            // Activate the main panel
-            ((BasicNetManager)NetworkManager.singleton).mainPanel.gameObject.SetActive(true);
-
             // Instantiate the player UI as child of the Players Panel
-            playerUI = Instantiate(playerUIPrefab, ((BasicNetManager)NetworkManager.singleton).playersPanel);
+            playerUI = Instantiate(playerUIPrefab, CanvasUI.instance.playersPanel);
 
             // Set this player object in PlayerUI to wire up event handlers
             playerUI.GetComponent<PlayerUI>().SetPlayer(this, isLocalPlayer);
@@ -130,7 +150,9 @@ public override void OnStopClient()
 
             // Disable the main panel for local player
             if (isLocalPlayer)
-                ((BasicNetManager)NetworkManager.singleton).mainPanel.gameObject.SetActive(false);
+                CanvasUI.instance.mainPanel.gameObject.SetActive(false);
         }
+
+        #endregion
     }
 }

Assets/Mirror/Examples/Basic/Scripts/PlayerUI.cs

@@ -59,6 +59,5 @@ void OnPlayerDataChanged(int newPlayerData)
             // Show the data in the UI
             playerDataText.text = string.Format("Data: {0:000}", newPlayerData);
         }
-
     }
 }