PlayerPrefs, First time applying and need help.

Question

Hello community.

I want to save lives after the level is restarted by pressing a button, I've applied PlayerPrefs but it do nothing on the practice.

Here I'll copy my scripts.

 using UnityEngine;
 using System.Collections;
 
 public class VidaScript : MonoBehaviour {
 
     //Interfaz Grafica Vida
     
     public int vida = 2;
     public GUIText LivesText;
 
     //Prueba
 
     public static string Vidas;
 
 
 
     void Start () {
 
         UpdateVida ();
     }
     
 
     public void Subtract (int newValueVida)
     {
         vida -= newValueVida;
         UpdateVida ();
         PlayerPrefs.SetInt (Vidas, newValueVida);
 
     }
     void UpdateVida ()
     {
         
         LivesText.text = "Lives: " + vida;
     }
 }

And the other script.

using UnityEngine; using System.Collections;

/// Script despues de morir

public class GameOverScript : MonoBehaviour {

 private VidaScript vidaScript;
 private int lives;

 void Start ()
 {
             GameObject vidaScriptObject = GameObject.FindGameObjectWithTag ("VidaScript");
             if (vidaScriptObject != null) {
                     vidaScript = vidaScriptObject.GetComponent <VidaScript> ();
             }
             if (vidaScript == null) {
                     Debug.Log ("No se puede encontrar VidaScript");
             }    

     }




 void OnGUI()
 {
     const int anchoBoton = 140;
     const int altoBoton = 60;
     
     if (
         GUI.Button(
         new Rect(
         Screen.width / 2 - (anchoBoton / 2),
         (1 * Screen.height / 3) - (altoBoton / 2),
         anchoBoton,
         altoBoton
         ),
         "Restart level"
         )
         )
     {
         // Reiniciamos el nivel y no destruimos.
         Application.LoadLevel(Application.loadedLevel);
         PlayerPrefs.GetInt(VidaScript.Vidas);
     }
     
     if (
         GUI.Button(
         new Rect(
         Screen.width / 2 - (anchoBoton / 2),
         (2 * Screen.height / 3) - (altoBoton / 2),
         anchoBoton,
         altoBoton
         ),
         "Back to MainScreen"
         )
         )
     {
         // Vamos a Menu
         Application.LoadLevel("StartScene");
     }
 }

}

If somebody can explain to me, why it don't work and how it works, I'll really appreciate it.

Thanks a lot for your help.

Answer 1

I've done it in a diferrent way. And it works perfect! Thanks for the help, Steel_Arm you guide me in the way.

Here's my code.

 using UnityEngine;
 using System.Collections;
 
 public class VidaScript : MonoBehaviour {
 
     //Interfaz Grafica Vida
     
     public int vida = 0;
     private static int vidasIniciales = 2;
     private static int vidasActuales;
     public GUIText LivesText;
 
     //Prueba
 
 
     static VidaScript ()
     {
         vidasActuales = PlayerPrefs.GetInt("lives", vidasIniciales);
     }
 
     public static int VidasActuales {
                 get { return vidasActuales; }
                 set {
                         vidasActuales = Mathf.Max (0, value); // Para que no de negativo.
                         PlayerPrefs.SetInt ("lives", vidasActuales);
                 }
         }
 
     void Start () 
     
     {
         vidasActuales = PlayerPrefs.GetInt("lives", vidasIniciales);
         UpdateVida ();
 
     }
 
 
 
     public void Subtract (int newValueVida)
     {
         vida -= newValueVida;
         UpdateVida ();
 
 
     }
     void UpdateVida ()
     {
         
         LivesText.text = "Lives: " + vidasActuales.ToString ();
     }
 
     public void drecrementoVidas ()
     {
                 vidasActuales--;
         PlayerPrefs.SetInt("lives", vidasActuales);
         }
     public void incrementoVidas ()
     {
                 vidasActuales++;
         PlayerPrefs.SetInt("lives", vidasActuales);
 
         }
     public void zeroVidas()
     {
         if (VidaScript.vidasActuales > 0)
             Application.LoadLevel("StartScene");
     }
 }

Answer 2

Answer by Steel_Arm · Aug 17, 2014 at 08:23 PM

Change this:

 PlayerPrefs.SetInt (Vidas, newValueVida);

to be this:

 PlayerPrefs.SetInt (Vidas, vida);

And this:

 PlayerPrefs.GetInt(VidaScript.Vidas);

should instead be this:

 vidaScript.vida = PlayerPrefs.GetInt(VidaScript.Vidas);

That should do it.

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Ryujose · Aug 18, 2014 at 03:13 PM 0

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Thanks for helping me, but It doesn't work.

I've this too in my script of health. Maybe it cause some error and restart the value?

     //Llamamos al VidaScript y a un int para newValueVida
     
     private VidaScript vidaScript;
     private int lives = 1;
     
     /// Es jugador o enemigo?
 
     public bool esEnemigo = true;
 
     void Start ()
     {
         GameObject vidaScriptObject = GameObject.FindGameObjectWithTag ("VidaScript");
         if (vidaScriptObject != null) {
             vidaScript = vidaScriptObject.GetComponent <VidaScript>();
         }
         if (vidaScript == null) {
             Debug.Log ("No se puede encontrar VidaScript");
         }    
     }
     
     void OnTriggerEnter2D(Collider2D collider)
     {
         //Es un disparo?
         Disparar disparo = collider.gameObject.GetComponent<Disparar>();
         if (disparo != null)
         {
             // Revisamos si es enemigo o compañero
             if (disparo.esDisparoEnemigo != esEnemigo)
             {
                 ps -= disparo.daño;
                 
                 // Destruimos el disparo
                 // No colocar solo Destroy()
                 //sino eliminara el Script
                 Destroy(disparo.gameObject);
                 
                 if (ps <= 0)
                 {
                     // Muerto + EfectoEspecial de particulas
                     vidaScript.Subtract(lives);
                     EfectosEspecialesScript.Instancia.Explosion(transform.position);
                     EfectosDeSonido.Instancia.ReproducirSonidoExplosion();
                     Destroy(gameObject);

Steel_Arm · Aug 22, 2014 at 05:57 AM 0

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Well, I don't see a place where you initialize the value of "vida". When you start a new game, you need to set the value of "vida" to something. Possibly, you could do this in vidaScript:

 void Start() {
     if (PlayerPrefs.HasKey(Vidas) == true) {
         vida = PlayerPrefs.GetInt(Vidas);
     }
     else {
         vida = 3; // set as whatever you want for initial lives.
     }
 }

And make sure you don't make VidaScript persistent, so it reloads with a level reload. With that, you change this:

 // Reiniciamos el nivel y no destruimos.
 Application.LoadLevel(Application.loadedLevel);
 PlayerPrefs.GetInt(VidaScript.Vidas);

To be just this:

 // Reiniciamos el nivel y no destruimos.
 Application.LoadLevel(Application.loadedLevel);

If I remember correctly, I think Application.LoadLevel() doesn't return anyways, so that line about PlayerPrefs.GetInt() is never reached. But I could be wrong. Either way, this should work. I think.

PlayerPrefs, First time applying and need help.

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