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Assets/Mirror/Examples/SyncDirection/Player.cs

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+using UnityEngine;
+
+namespace Mirror.Examples.SyncDir // ".SyncDirection" would overshadow the enum
+{
+    public class Player : NetworkBehaviour
+    {
+        public TextMesh textMesh;
+        public Color localColor = Color.white;
+
+        [SyncVar] public int health;
+        readonly SyncList<int> list = new SyncList<int>();
+
+        public override void OnStartLocalPlayer()
+        {
+            textMesh.color = localColor;
+        }
+
+        void Update()
+        {
+            // show health and list for everyone
+            textMesh.text = $"{health} / {list.Count}";
+
+            // key presses increase health / list for local player.
+            // note that trusting the client is a bad idea, especially with health.
+            // SyncDirection is usually used for movement.
+            //
+            // when using custom OnSerialize, the custom OnDeserialize can still
+            // safely validate client data (check position, velocity etc.).
+            // this is why it's named SyncDirection, and not ClientAuthority.
+            // because the server can still validate the client's data first.
+            //
+            // try to change SyncDirection to ServerToClient in the editor.
+            // then restart the game, clients won't be allowed to change their
+            // own health anymore.
+            if (isLocalPlayer)
+            {
+                if (Input.GetKeyDown(KeyCode.Space))
+                    ++health;
+
+                if (Input.GetKeyDown(KeyCode.L))
+                    list.Add(list.Count);
+            }
+        }
+
+        // show instructions
+        void OnGUI()
+        {
+            if (!isLocalPlayer) return;
+
+            int width = 250;
+            int height = 50;
+            GUI.color = localColor;
+            GUI.Label(
+                new Rect(Screen.width / 2 - width / 2, Screen.height / 2 - height / 2, width, height),
+                "Press Space to increase your own health!\nPress L to add to your SyncList!");
+        }
+    }
+}