Recap: Save Slots

Part of the Game Architecture in Unity section of Coddy's Unity journey. Lesson 27 of 50.

Challenge

Medium

A farming game has three save slots, each in its own file: slot1.json, slot2.json and slot3.json in Application.persistentDataPath. Write SlotSave and the SlotMenu:

SlotSave (in SlotSave.cs) is a [System.Serializable] class with the public fields day and gold. A new farm starts on day 1 with 20 gold, and a save from an older version that lacks a value gets that same starting value.
When the game starts, the menu loads every slot that has a file. Slot 1 is selected; the down arrow selects the next slot and the up arrow the one before, stopping at slot 3 and slot 1.
The three slotTexts show each slot as Slot 2: Day 4, 65 gold or Slot 2: empty, and the selected slot's line starts with > , as > Slot 1: empty.
Space on an empty slot starts a new farm there. Space on a slot in use plays a day: the day goes up by 1 and the gold by 15. Either way the slot is saved to its file.
The Delete button calls DeleteSelected(), which deletes the selected slot's file and empties the slot.

Press Play, start a farm or two and play some days, then Stop and Play again. Then Check.

Try it yourself

using System.IO;
using UnityEngine;
using UnityEngine.InputSystem;
using TMPro;

public class SlotMenu : MonoBehaviour
{
    public TMP_Text[] slotTexts;

    // The Delete button calls this
    public void DeleteSelected()
    {
    }
}