Cannot retrieve score from previous scene/level

Question

Hello, I am new in unity and I'm currently developing a space shooter shmup for my school project. I have a script that gets the current score and high score then saves it. Here it is

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class ScoreManager : MonoBehaviour 
 {
     public int score;
     public int BestScore;
     public Text ScoreText;
 
     // Use this for initialization
     void Awake () 
     {
         ScoreText = GetComponent<Text> ();
         BestScore = PlayerPrefs.GetInt ("bestScore");
         score = 0;
     }
 
     // Update is called once per frame
     void Update () 
     {
         ScoreText.text = "Score: " + score;
         if (score > BestScore) 
         {
             BestScore = score; 
         }
         GameObject.Find("Score").GetComponent<Text>().text=""+score;
         GameObject.Find("Best").GetComponent<Text>().text=""+PlayerPrefs.GetInt("bestScore");
     }
     public void OnDestroy()
     {
         PlayerPrefs.SetInt ("bestScore", BestScore);
         PlayerPrefs.Save ();
     }
 }

Now the problem is that when I proceed to another scene, the current score returns to zero but the high score remains as it is which is fine but I need to retrieve the score from the previous scene to the current scene then continue gaining score as I destroy enemies just like in similar games. I have tried using DoNotDestroyOnLoad and PlayerPref.GetInt but it still doesn't work or perhaps I've made a mistake on my part. I have tried looking up for other solutions but still no luck so I thought I'd ask here. Thank you in advance.

Answer 1

There are a few ways to do this. One is the DontDestroyOnLoad as jeffreyrampineda said, but it might cause problems if you designed your game differently. I think the best way for you is a static value.

 public class ScoreManager : MonoBehaviour 
 {
     public static int lastScore; //static value so it does not get reset when the manager is reloaded
     public int score;
     public int BestScore;
     public Text ScoreText;
 
     // Use this for initialization
     void Awake () 
     {
         ScoreText = GetComponent<Text> ();
         BestScore = PlayerPrefs.GetInt ("bestScore");
         score = 0;
     }
 
     // Update is called once per frame
     void Update () 
     {
         ScoreText.text = "Score: " + score;
         if (score > BestScore) 
         {
             BestScore = score; 
         }
         GameObject.Find("Score").GetComponent<Text>().text=""+score;
         GameObject.Find("Best").GetComponent<Text>().text=""+PlayerPrefs.GetInt("bestScore");
     }
     public void OnDestroy()
     {
         PlayerPrefs.SetInt ("bestScore", BestScore);
         PlayerPrefs.Save ();
         lastScore = score; //set lastScore at the end of the level
         //you can now use this when another level is loaded
     }
 }

Note that this solution wont work if you quit the game. In that case you will have to save it in playerprefs too.

Cannot retrieve score from previous scene/level

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