How to use PlayerPrefs

Question

Hey guys, i started to work on a simple game yesterday, and it's almost done, but i wanted to implement a Shop for the Player to buy things. I already made a system to store how many points the Player has, but i don't know how to save a float after the game is closed, and then restore it once it opens. I've been reading a little, and i discovered that there is one way, and you gotta use PlayerPrefs, but i never used it, and i didn't get what am i supposed to do and how. Could someone explain to me how would i use PlayerPrefs to save a variable once the game is closed, and then restore it once it is opened again?

Thank you kindly =]

Answer 1

Answer by Utopians · Apr 28, 2020 at 12:47 PM

Writing:

 PlayerPrefs.SetInt("score",5);
 PlayerPrefs.SetFloat("volume",0.6f);
 PlayerPrefs.SetString("username","John Doe");
 PlayerPrefs.Save();

// If you need boolean value:

 bool val = true;
 PlayerPrefs.SetInt("PropName", val ? 1 : 0);
 PlayerPrefs.Save();

Reading:

 int score = PlayerPrefs.GetInt("score");
 float volume = PlayerPrefs.GetFloat("volume");
 string player = PlayerPrefs.GetString("username");
 
 bool val = PlayerPrefs.GetInt("PropName") == 1 ? true : false;

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Answer 2

Answer by Commoble · Mar 13, 2017 at 01:25 AM

Playerprefs is meant for saving player preferences; you wouldn't want to use it to save high scores and progress data, because it's not difficult for players to edit the playerprefs data.

There's a couple of ways to save data safely, and this official unity tutorial video goes over one of them, using C#'s BinaryFormatter.

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Answer 3

At start of your game you use PlayerPrefs.GetInt("Player level"); to restore your player level (or something else).

Than you play your game and....

On disable() you use PlayerPrefs.SetInt("Player level", currentLevel); to write you current value (player level etc.).

It is an example of using PlayerPrefs with simple player level up system:

 public class ExperienceLevelSystem : MonoBehaviour {
     
         public static int currentXP;
     
         private void Start()
         {
             if (PlayerPrefs.HasKey("currentXP"))
             {
                 currentXP = PlayerPrefs.GetInt("currentXP");
             }
     
             Updated();
         }
     
         private void Update()
         {
             if (currentXP >= maxXP)
             {
                 LevelUpSystem();
             }
     
             Updated();
         }
     
         public void LevelUpSystem()
         {
             //currentXP = currentXP - maxXP;
             maxXP = 200 + 200 * (currentLevel * currentLevel);
             currentLevel++;
             levelUpMessage.SetActive(true);
             Time.timeScale = 0;
     
         public static void Add(int pointsToAdd)
         {
             currentXP += pointsToAdd;
         }
     
         void OnDisable()
         {
             PlayerPrefs.SetInt("currentLevel", currentLevel);
         }

Answer 4

Answer by SuryaPrakashModi · Aug 17, 2020 at 02:06 PM

https://www.youtube.com/watch?v=GcnERRQ6K8Q

i think this video will be helpfull

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How to use PlayerPrefs

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