Finished Title Screen UI and Added IP Validation

- Finished adding UI for the title screen
- Scripted functions for each button press
- Validation of IP entered for private server connection
- Popup Error Panel with variable error messages added

Assets/Scripts/Network/ConnectButtons.cs

@@ -0,0 +1,79 @@
+using MLAPI;
+using System.Linq;
+using UnityEngine;
+using UnityEngine.UI;
+
+public class ConnectButtons : MonoBehaviour {
+
+    private NetworkManager netManager;
+
+    public GameObject ErrorPanel;
+    public Text ErrorText;
+
+    public InputField ipAddressField;
+
+    void Start() {
+        // Make sure the Error Panel is not enabled to start
+        ErrorPanel.SetActive(false);
+
+        // Find the network manager that was created during the preloader scene
+        netManager = FindObjectOfType<NetworkManager>();
+    }
+
+    // Connect to the dedicated server
+    public void ConnectDedicatedServer () {
+        // TODO: Connect to the dedicated server
+        ThrowError("Connect to Dedicated Server Not Implemented Yet!");
+    }
+
+    // Host a private server
+    public void HostPrivateServer() {
+        // TODO: Host a private server
+        ThrowError("Host Private Server Not Implemented Yet!");
+    }
+
+    // Connect to a private server via IP Address
+    public void ConnectToPrivateServer() {
+        string ipAddress = ipAddressField.text;
+
+        // Check if the IP Address is valid
+        if (!ValidateIPv4(ipAddress)) {
+            ThrowError("Invalid IP Address!  Please enter a valid IP Address and try again!");
+            return;
+        }
+
+        // IP Address is valid - Attempt to connect
+
+        // TODO: Attempt to connect to host at ip address
+        ThrowError("Connecting to Private Server Not Implemented Yet!\nValid IP Address: " + ipAddress);
+    }
+
+    private void ThrowError(string errorMsg) {
+        ErrorText.text = errorMsg;
+
+        ErrorPanel.SetActive(true);
+    }
+
+    public void DismissError() {
+        ErrorText.text = "";
+
+        ErrorPanel.SetActive(false);
+    }
+
+    // Method by: Habib (Stack Overflow)
+    // https://stackoverflow.com/questions/11412956/what-is-the-best-way-of-validating-an-ip-address
+    private bool ValidateIPv4(string ipString) {
+        if (string.IsNullOrWhiteSpace(ipString)) {
+            return false;
+        }
+
+        string[] splitValues = ipString.Split('.');
+        if (splitValues.Length != 4) {
+            return false;
+        }
+
+        byte tempForParsing;
+
+        return splitValues.All(r => byte.TryParse(r, out tempForParsing));
+    }
+}

Assets/Scripts/Network/ConnectButtons.cs.meta

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