PlayerPrefs and Unlocking Scenes

Question

Hi, I have just set up a player prefs variable that whenever a scene is loaded, sets the value of the int to the build index. Here is the script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine.SceneManagement;
 using UnityEngine;
 
 public class CheckLastScene : MonoBehaviour
 {
     // Start is called before the first frame update
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
         Debug.Log(PlayerPrefs.GetInt("loadedLevel"));
         PlayerPrefs.SetInt("loadedLevel", SceneManager.GetActiveScene().buildIndex);
     }
 }

But the problem is that the script that unlocks the buttons once the level is completed and you go to the level selection resets once I revisit or proceed to the next level. Here is the script(Sorry it's long):

 using System.Collections;
 using System.Collections.Generic;
 
 using UnityEngine;
 using UnityEngine.SceneManagement;
 using UnityEngine.UI;
 
 public class UnlockAll : MonoBehaviour
 {
     public Button[] buttons;
     public InputField input;
     public Text text;   
     public string answer;
     public ChangeScenes script;
     public InputField winText;
     public Button b1;
     public Button b2;
     public Button b3;
     public Button b4;
     public Button b5;
     public Button b6;
     public Button b7;
     public Button b8;
     public Button b9;
     public Button b10;
     public Button b11;
     public Button b12;
     public Button b13;
     public Button b14;
     public Button b15;
     public string win = "Demo Reached, More Levels Coming Soon!";
 
     void Start()
     {
         Debug.Log(PlayerPrefs.GetInt("loadedLevel"));
     }
 
     void Update()
     {
         if (PlayerPrefs.GetInt("loadedLevel") >= 22) 
         {
             b1.enabled = true;
             b2.enabled = true;
             b3.enabled = true;
             b4.enabled = true;
             b5.enabled = true;
             b6.enabled = true;
             b7.enabled = true;
             b8.enabled = true;
             b9.enabled = true;
             b10.enabled = true;
             b11.enabled = true;
             b12.enabled = true;
             b13.enabled = true;
             b14.enabled = true;
             b15.enabled = true;
         }
         answer = input.text;
 
         if (answer == "UnlockAll")
         {
             b1.enabled = true;
             b2.enabled = true;
             b3.enabled = true;
             b4.enabled = true;
             b5.enabled = true;
             b6.enabled = true;
             b7.enabled = true;
             b8.enabled = true;
             b9.enabled = true;
             b10.enabled = true;
             b11.enabled = true;
             b12.enabled = true;
             b13.enabled = true;
             b14.enabled = true;
             b15.enabled = true;
 
             Debug.Log("Levels Enabled");
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 5) 
         {
             Debug.Log("Level 2 Unlocked");
             b1.interactable = true;
             b2.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 6)
         {
             Debug.Log("Level 3 Unlocked");
             b1.interactable = true;
             b2.interactable = true;
             b3.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 7)
         {
             Debug.Log("Level 4 Unlocked");
             b1.interactable = true;
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 8)
         {
             Debug.Log("Level 5 Unlocked");
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
             b5.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 9)
         {
             Debug.Log("Level 6 Unlocked");
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
             b5.interactable = true;
             b6.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 10)
         {
             Debug.Log("Level 7 Unlocked");
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
             b5.interactable = true;
             b6.interactable = true;
             b7.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 11)
         {
             Debug.Log("Level 8 Unlocked");
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
             b5.interactable = true;
             b6.interactable = true;
             b7.interactable = true;
             b8.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 12)
         {
             Debug.Log("Level 9 Unlocked");
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
             b5.interactable = true;
             b6.interactable = true;
             b7.interactable = true;
             b8.interactable = true;
             b9.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 13)
         {
             Debug.Log("Level 10 Unlocked");
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
             b5.interactable = true;
             b6.interactable = true;
             b7.interactable = true;
             b8.interactable = true;
             b9.interactable = true;
             b10.interactable = true;
         }
 
         if (PlayerPrefs.GetInt("loadedLevel") == 14)
         {
             Debug.Log("Level 11 Unlocked");
             b2.interactable = true;
             b3.interactable = true;
             b4.interactable = true;
             b5.interactable = true;
             b6.interactable = true;
             b7.interactable = true;
             b8.interactable = true;
             b9.interactable = true;
             b10.interactable = true;
             b11.interactable = true;
         }
     }
 }

Thanks in advance for anyone who helps as I am quite frustrated

Answer 1

If you don't want progress to regress, then you should check that the new value isn't lower than the value that is already saved. That aside, there are a few things to point out here;

First off, I can't see any reason to have this stuff in Update - Update is called every frame, but all of this only needs to happen once at any one time. You also access the same variable from playerprefs many times; it would be worth caching that in a local variable and reusing that instead.

One other thing I would do is use an array of buttons rather than declare each button individually; you are already naming them with an index, so changing to an array wouldn't make much of a difference, however it would allow you to do things much more efficiently.

Here's how those changes would look;

  public class CheckLastScene : MonoBehaviour
  {
      void Start()
      {
          int lastLoadedLevel = PlayerPrefs.GetInt ("loadedLevel");
          int currentLevel = SceneManager.GetActiveScene().buildIndex;

          Debug.Log(lastLoadedLevel);
          //Make sure we are only making new progress
          if (currentLevel > lastLoadedLevel)
              PlayerPrefs.SetInt("loadedLevel", currentLevel);
      }
  }

And in the main class;

  public class UnlockAll : MonoBehaviour
  {
      public Button[] buttons;
      public InputField input;
      public Text text;   
      public string answer;
      public ChangeScenes script;
      public InputField winText;
      //'b1' = 'levelButtons[0]', 'b2' = 'levelButtons[1]', etc.
      public Button[] levelButtons = new Button[15];
      public string win = "Demo Reached, More Levels Coming Soon!";
  
      void Start()
      {
          Debug.Log(PlayerPrefs.GetInt("loadedLevel"));
          //Call this once when the level is loaded
          UnlockLevels ();
      }
  
      void UnlockLevels()
      {
          //Store these for reuse
          int level = PlayerPrefs.GetInt("loadedLevel");
          answer = input.text;
          if (level >= 22 || answer == "UnlockAll") 
          {
              //Iterate through every button and enable them all
              for (int i = 0; i < levelButtons.Length; i++)
                  levelButtons[i].interactable = true;
  
              Debug.Log("Levels Enabled");
          }
          else if (level > 4 && level < 15)    //If we are within the right range
          {
              //Iterate through every button up to the required one and enable them
              for (int i = 0; i < level - 3; i++)
                  levelButton[i].interactable = true;
 
              Debug.LogFormat ("Level {0} Unlocked", level - 2);
          }
      }
  }

PlayerPrefs and Unlocking Scenes

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