Starter

Assets/_Content/Scripts/UI/UiManager.cs

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+using UnityEngine;
+using Arena.Characters;
+
+namespace Arena.UI
+{
+    /// <summary>
+    /// Single entry point of the UI: connects the views to the player and switches screens.
+    /// </summary>
+    public class UiManager : MonoBehaviour
+    {
+        [System.Serializable]
+        private struct References
+        {
+            [Tooltip("In-game screen: health, ammo.")]
+            public GameObject Hud;
+            public HealthView HealthView;
+            public AmmoView AmmoView;
+            public GameOverView GameOverView;
+        }
+
+        #region FIELDS
+
+        [SerializeField] private References _references;
+
+        private Player _player;
+
+        #endregion
+
+        #region UNITY LIFECYCLES
+
+        void Start()
+        {
+            // Start: every Awake has run, so Player.Instance is set
+            _player = Player.Instance;
+
+            if (!_player)
+            {
+                Debug.LogError("UiManager: no Player in the scene.", this);
+                return;
+            }
+
+            _references.HealthView.Bind(_player.Health);
+            _references.AmmoView.Bind(_player.Launcher);
+            _player.Health.OnDied += HandlePlayerDied;
+
+            _references.Hud.SetActive(true);
+            _references.GameOverView.Hide();
+        }
+
+        void OnDestroy()
+        {
+            if (_player)
+                _player.Health.OnDied -= HandlePlayerDied;
+        }
+
+        #endregion
+
+        #region PRIVATE METHODS
+
+        private void HandlePlayerDied()
+        {
+            _references.Hud.SetActive(false);
+            _references.GameOverView.Show();
+        }
+
+        #endregion
+    }
+}