Scriptum/Assets/Scripts/HealthBar.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class HealthBar : MonoBehaviour
{
    public Slider slider;
    public float maxHealth;
    public float health;

    public Text displayText;
    public float currentHealth;
    public string maxHealthString;
    public string currentHealthString;

    public void SetMaxHealth(float health)
    {

        maxHealth = PlayerPrefs.GetFloat("maxHealth");
        slider.maxValue = maxHealth;
    }

    //public void SetHealth(float health)
    //{
     //   slider.value = health;
    //}

    void Update()
    {
        maxHealth = PlayerPrefs.GetFloat("maxHealth");
        health = PlayerPrefs.GetFloat("health");
        slider.maxValue = maxHealth;
        slider.value = health;

        currentHealth = PlayerPrefs.GetFloat("health");
        maxHealthString = maxHealth.ToString();
        currentHealthString = currentHealth.ToString();
        displayText.text = currentHealthString + "/" + maxHealthString;
        //SetExp(exp);
    }
}