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Assets/Mirror/Examples/Chat/Scripts/LoginUI.cs

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+using UnityEngine;
+using UnityEngine.UI;
+
+namespace Mirror.Examples.Chat
+{
+    public class LoginUI : MonoBehaviour
+    {
+        [Header("UI Elements")]
+        [SerializeField] internal InputField networkAddressInput;
+        [SerializeField] internal InputField usernameInput;
+        [SerializeField] internal Button hostButton;
+        [SerializeField] internal Button clientButton;
+        [SerializeField] internal Text errorText;
+
+        public static LoginUI instance;
+
+        string originalNetworkAddress;
+
+        void Awake()
+        {
+            instance = this;
+        }
+
+        void Start()
+        {
+            // if we don't have a networkAddress, set a default one.
+            if (string.IsNullOrWhiteSpace(NetworkManager.singleton.networkAddress))
+                NetworkManager.singleton.networkAddress = "localhost";
+
+            // cache the original networkAddress for resetting if blank.
+            originalNetworkAddress = NetworkManager.singleton.networkAddress;
+        }
+
+        void Update()
+        {
+            // bidirectional sync of networkAddressInput and NetworkManager.networkAddress
+            // Order of operations is important here...Don't switch the order of these steps.
+            if (string.IsNullOrWhiteSpace(NetworkManager.singleton.networkAddress))
+                NetworkManager.singleton.networkAddress = originalNetworkAddress;
+
+            if (networkAddressInput.text != NetworkManager.singleton.networkAddress)
+                networkAddressInput.text = NetworkManager.singleton.networkAddress;
+        }
+
+        // Called by UI element UsernameInput.OnValueChanged
+        public void ToggleButtons(string username)
+        {
+            hostButton.interactable = !string.IsNullOrWhiteSpace(username);
+            clientButton.interactable = !string.IsNullOrWhiteSpace(username);
+        }
+    }
+}