How do I replace void OnGUI? C#

Question

How do I replace the void OnGUI with buttons I make myself in my code below?

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SelectUsername : MonoBehaviour
 {
     public static int userNumber = -1; //current user (<0 means nothing selected)
     public static string userName = "";
     string[] usernames;
     int numUsers = 0;
     
     // Start is called before the first frame update
     void Start()
     {
         numUsers = PlayerPrefs.GetInt("NumUsers", 0); // how many registered users?
         usernames = new string[numUsers + 1]; //create user name list...
         for (int n = 1; n <= numUsers; n++)
         {
             usernames[n] = PlayerPrefs.GetString("User" + n); // ...and load them.
         }
     }
 
     // Update is called once per frame
     void OnGUI()
     {
         if (userNumber < 0) //if any number isn't defined yet do the following
         {
             Rect r = new Rect(300, 300, 300, 100);  // create basic rectangle
             GUI.Label(r, "Select User");
             for (int n = 1; n <= numUsers; n++)
             {
                 r.y += 100;  // offset rect to the next line
                 if (GUI.Button(r, usernames[n]))
                 {
                     // if user selected...
                     userNumber = n;  // save number...
                     userName = usernames[n];
                 }
             }
         }
     }
 }

AND how do I display the user's name in my own textbox on the main screen? I know how to do it for only 1 registered user, but am having the worst time telling the PlayerPrefs which user is selected. Can someone PLEASE show mercy on me?

Answer 1

1. In your scene, create a canvas if you don't have any :`GameObject` menu > UI > Canvas

2. Select your canvas, and create a button : GameObject menu > UI > Button

3. Click on the button, and drag&drop it in the Project view, inside a Prefabs folder)

4. Delete the button from your scene you have added step #2

5. Select your canvas, and add a child gameObject : GameObject menu > Create empty child

6. Select the created child, and name it UsersList, resize it and place it wherever you want in your canvas

7. Select the child created step #5, in the inspector, click on AddComponent > VerticalLayoutGroup and check Width ofthe ChildControlsSize

8. Change your code as follow:

  using System.Collections;
  using System.Collections.Generic;
  using UnityEngine;
  using UnityEngine.UI;
  
  public class SelectUsername : MonoBehaviour
  {
      public GameObject UserButton;
      public LayoutGroup UsersListParent;
      public static int userNumber = -1; //current user (<0 means nothing selected)
      public static string userName = "";
      string[] usernames;
      int numUsers = 0;
      private Button[] userButtons ;
      
      // Start is called before the first frame update
      void Start()
      {
          numUsers = PlayerPrefs.GetInt("NumUsers", 0); // how many registered users?
          usernames = new string[numUsers]; //create user name list...
          userButtons = new Button[numUsers];
          for (int n = 1; n <= numUsers; n++)
          {
              usernames[n - 1] = PlayerPrefs.GetString("User" + n); // ...and load them.
          }

          BuildGUI();
      }

      // Update is called once per frame
      void BuildGUI()
      {
          for( int i= 0 ; i < usernames.Length ; ++i )
          {
              AddUserButton( usernames[i], i ) ;
          }
      }

      void AddUserButton( string name, int index )
      {
          GameObject go = Instantiate( UserButton, UsersListParent.transform ) ;
          Text text = go.GetComponentInChildren<Text>();
          Button userButton = go.GetComponent<Button>();
          text.text = name;
          userButton.onClick.AddListener( () => SelectUser( index ) ) ;
          userButtons[index] = userButton;
      }

      void SelectUser( int index )
      {
          Debug.LogFormat( "User {0} (#{1}) has been selected", usernames[index], index ) ;

          // The two following lines are optional
          if( userNumber >= 0 )
              userButtons[index].GetComponent<Image>().color = Color.white;

          userNumber = index;
          userName = usernames[index];

          // The two following lines are optional
          if( userNumber >= 0 )
              userButtons[index].GetComponent<Image>().color = Color.red;
      }
  }

9. Select the gameObject holding the previous script, drag the prefab you have created step #3, and drop it in the UserButton slot in the inspector

10. Select the gameObject holding the script step #8, drag the gameObject created step #5 (with the VerticalLayout component), and drop it in the UsersListParent slot in the inspector

How do I replace void OnGUI? C#

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