u3d-master-2d-book/Assets/Scripts/Game/MapPosition.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.SceneManagement;

/// <summary>
/// This class is attached to the player object (prefab). It will call the GameState class
/// to set and get the player's position in a scene and place the player at that position.
/// </summary>
public class MapPosition : MonoBehaviour {

    /// <summary>
    /// When the player enters a scene, this method will query the GameState to get the player's
    /// last know position in this scene. Then it will place the player object at that location.
    /// </summary>
    void Awake()
    {
        var lastPosition = GameState.GetLastScenePosition(SceneManager.GetActiveScene().name);

        if (lastPosition != Vector3.zero)
        {
            transform.position = lastPosition;
        }
    }

    /// <summary>
    /// When the player leaves a scene, this method will save the player's position in the scene.
    /// Scenes that are loaded with the Navigation Manager will cause an infinite loading loop, so 
    /// they will set the saveLastPosition flag to false and not save the position rather using a 
    /// configured starting position to place the player object.
    /// </summary>
    void OnDestroy()
    {
        if (GameState.saveLastPosition)
        {
            GameState.SetLastScenePosition(SceneManager.GetActiveScene().name, transform.position);
        }
    }
}