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Assets/Mirror/Examples/TopDownShooter/Scripts/NetworkTopDown.cs

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+using UnityEngine;
+using Mirror;
+
+namespace Mirror.Examples.TopDownShooter
+{
+    public class NetworkTopDown : NetworkBehaviour
+    {
+        public CanvasTopDown canvasTopDown;
+
+        // Have as many enemy variations as you want, remember to set them in NetworkManagers Registered Spawnable Prefabs array.
+        public GameObject[] enemyPrefabs;
+        // For our square map with no obstacles, we'l just set a range, for your own game, you may have set spawn points
+        public Vector2 enemySpawnRangeX;
+        public Vector2 enemySpawnRangeZ;
+
+        [SyncVar(hook = nameof(OnEnemyCounterChanged))]
+        public int enemyCounter = 0;
+
+        public override void OnStartServer()
+        {
+#if !UNITY_SERVER
+            canvasTopDown.ResetUI();
+#endif
+            // Spawn one enemy on start of game, then let player host spawn more via button
+            SpawnEnemy();
+        }
+
+#if !UNITY_SERVER
+        public override void OnStartClient()
+        {
+            canvasTopDown.ResetUI();
+        }
+#endif
+
+        [ServerCallback]
+        public void SpawnEnemy()
+        {
+            if (isServer == false)
+            {
+                print("Only server can spawn enemies, or clients via cmd request.");
+            }
+            else
+            {
+                // Select random enemy prefab if we have more than one
+                GameObject enemy = Instantiate(enemyPrefabs[Random.Range(0, enemyPrefabs.Length)]);
+                // Set random spawn position depending on our ranges set via inspector
+                enemy.transform.position = new Vector3(Random.Range(enemySpawnRangeX.x, enemySpawnRangeX.y), 0, Random.Range(enemySpawnRangeZ.x, enemySpawnRangeZ.y));
+                // Network spawn enemy to current and new players
+                NetworkServer.Spawn(enemy);
+                enemyCounter += 1;
+#if !UNITY_SERVER
+                // update UI
+                canvasTopDown.UpdateEnemyUI(enemyCounter);
+#endif
+            }
+        }
+
+        void OnEnemyCounterChanged(int _Old, int _New)
+        {
+#if !UNITY_SERVER
+            canvasTopDown.UpdateEnemyUI(enemyCounter);
+#endif
+        }
+        
+    }
+}