problem count life of the player.

Contovita:

 using UnityEngine;
 using System.Collections;
 
 public class Contovita : MonoBehaviour {
     
     public static int temp = 3;
     
     void Update () {
         
         guiText.text = LevelManager.life.ToString();
         
         print(temp);
         
     }
 }

LevelManager:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System;
 using UnityEditor;
 
 public class LevelManager : MonoBehaviour 
 {
     public static LevelManager Instance { get; private set; }
 
     public Player Player { get; private set; }
     public CameraController Camera { get; private set; }
     public TimeSpan RunningTime { get { return DateTime.UtcNow - _started; } }
     public static int life = 3;
     public static int temp = 3;
 
     public int CurrentTimeBonus
     {
         get
 
         {
             var secondDifference = (int) (BonusCutoffSeconds - RunningTime.TotalSeconds);
             return Mathf.Max(0, secondDifference) * BonusSecondMultiplier;
         }
     }
 
     private List<Checkpoint> _checkpoints;
     private int _currentCheckpointIndex;
     private DateTime _started;
     private int _savedPoints;
 
     public Checkpoint DebugSpawn;
     public int BonusCutoffSeconds;
     public int BonusSecondMultiplier;
 
     public void Awake()
     {
         _savedPoints = GameManager.Instance.Points;
         Instance = this;
     }
 
     public void Start () 
     {
         _checkpoints = FindObjectsOfType<Checkpoint>().OrderBy(t => t.transform.position.x).ToList();
         _currentCheckpointIndex = _checkpoints.Count > 0 ? 0 : -1;
 
         Player = FindObjectOfType<Player>();
         Camera = FindObjectOfType<CameraController>();
 
         _started = DateTime.UtcNow;
 
         var listeners = FindObjectsOfType<MonoBehaviour>().OfType<IPlayerRespawnListener>();
         foreach (var listener in listeners)
     
         {
             for (var i = _checkpoints.Count - 1; i >= 0; i--)
             {
                 var distance = ((MonoBehaviour)listener).transform.position.x - _checkpoints[i].transform.position.x;
                 if (distance < 0)
                     continue;
 
                 _checkpoints[i].AssignObjectToCheckpoint(listener);
                 break;
             }
         }
 
 #if UNITY_EDITOR
         if (DebugSpawn != null)
         DebugSpawn.SpawnPlayer(Player);
         else if (_currentCheckpointIndex != -1)
         _checkpoints[_currentCheckpointIndex].SpawnPlayer(Player);
 #else
         if (_currentCheckpointIndex != -1)
         _checkpoints[_currentCheckpointIndex].SpawnPlayer(Player);
 
 #endif
 }
 
         public    void Update () 
         {
             var isAtLastCheckpoint = _currentCheckpointIndex + 1 >= _checkpoints.Count;
             if (isAtLastCheckpoint)
                 return;
 
             var distanceToNextCheckpoint = _checkpoints[_currentCheckpointIndex + 1].transform.position.x - Player.transform.position.x;
             if (distanceToNextCheckpoint >= 0)
                 return;
 
             _checkpoints[_currentCheckpointIndex].PlayerLeftCheckpoint();
            _currentCheckpointIndex++;
             _checkpoints[_currentCheckpointIndex].PlayerHitCheckpoint();
 
         GameManager.Instance.AddPoints(CurrentTimeBonus);
         _savedPoints = GameManager.Instance.Points;
         _started = DateTime.UtcNow;
 
         }
 
         public void GotoNextLevel(string levelName)
         {
             StartCoroutine(GotoNextLevelCo(levelName));
         }
 
         private IEnumerator  GotoNextLevelCo(string levelName)
         {
             Player.FinishLevel();
             GameManager.Instance.AddPoints(CurrentTimeBonus);
 
             FloatingText.Show("Level Complete!", "CheckpointText", new CenteredTextPositioner(.2f));
             yield return new WaitForSeconds(1);
         
             FloatingText.Show(string.Format("{0} points!", GameManager.Instance.Points), "CheckpointText", new CenteredTextPositioner(.1f));
             yield return new WaitForSeconds(5f);
 
             if (string.IsNullOrEmpty(levelName))
                 Application.LoadLevel("StartScreen");
             else
                 Application.LoadLevel(levelName);
             }
 
         public void KillPlayer()
         {
             StartCoroutine(KillPlayerCo());
         }
 
         private IEnumerator KillPlayerCo()
         {
             Player.Kill();
             Camera.IsFollowing = false;
             yield return new WaitForSeconds(2f);
 
         if(HealthBar.life <= 0){
             HealthBar.life --;
             GameObject.Find("Vita3").guiText.text = ""+HealthBar.life;
             print("YOU NOW HAVE " + HealthBar.life + "life");
             Application.LoadLevel("gameover");
         }
 
 
             Camera.IsFollowing = true;
 
             if (_currentCheckpointIndex != -1)
                 _checkpoints[_currentCheckpointIndex].SpawnPlayer(Player);
 
             _started = DateTime.UtcNow;
             GameManager.Instance.ResetPoints(_savedPoints);
 
         }
 
         }

HealthBar:

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using System;
 using UnityEditor;
 
 public class HealthBar : MonoBehaviour 
 {
 
     public static int life = 0;
     public static int temp = 3;
 
     public Player Player;
     public Transform ForegroundSprite;
     public SpriteRenderer ForegroundRenderer;
     public Color MaxHealthColor = new Color(255 / 255f, 63 / 255f, 63 / 255f);
     public Color MinHealthColor = new Color(64 / 255f, 137 / 255f, 255 / 255f);
 
     void Start()
     {
         life += 3;
 
         HealthBar.life -= 1;
         LevelManager.life -= 1;
     }
 
 
     // Update is called once per frame
     public void Update () 
     {
         var healthPercent = Player.Health / (float) Player.MaxHealth;
     
         ForegroundSprite.localScale = new Vector3(healthPercent, 1, 1);
         ForegroundRenderer.color = Color.Lerp(MaxHealthColor, MinHealthColor, healthPercent);
 
     }
 }

If the score stays 2 and we don't go to the gameover scene, everything is fine. The code works. The only thing left to do is to decide when to call Health.life -=1; (change for convovita LevelManager to Health, this will make things easier)

So go on and delete that 2 line of code from the void Start ( we dont need HealthBar.life -=1; and LevelManager.life -=1; in the script "Healthbar" anymore).

Go to Unity, create a 3d Object (cube). Click on the cube in the hierarchy, go to the inspector and change in the boxcollider, isTrigger to check = true. And attach the tag "Player" to the player.

We are going to add this script to that cube.

 using UnityEngine;
 using System.Collections;
 
 public class ReducesLife : MonoBehaviour {
     
     void OnTriggerEnter (Collider col)
     {
         if (col.tag == "Player")
         {
             Health.life -= 1;
         }
     }
 }

Now everytime the player walks through that cube the Health will be reduced by 1. We succesfully made a game mechanic on how to reduce the lives for the player.