Coin Counter in multiple-level game

Ive made a coin counter in my game, but everytime i get to the next level (scene), it resets the coin counter from the previous coins collected. Id also like to be able to, if you die in lvl.2, to still keep the coins from lvl.1 but the coins collected from lvl.2 at that point resets until you are on to the next level.

Any help would be awsome, Thank you!

This is the code so far:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6.  
7. public class ItemCollector : MonoBehaviour
8. {
9.     int coins = 0;
10.  
11.     [SerializeField] Text coinsText;
12.     [SerializeField] AudioSource collectionSound;
13.  
14.     private void OnTriggerEnter(Collider other)
15.     {
16.         if (other.gameObject.CompareTag("Coin"))
17.         {
18.             Destroy(other.gameObject);
19.             coins++;
20.             coinsText.text = "Coins: " + coins;
21.             collectionSound.Play();
22.         }
23.     }
24. }

 

Use Additive scene loading to keep a constant single instance of your ItemCollector class, and then PlayerPrefs to make it persistent.

 

Okay I'll try it out, Thank you!

 

You can use additive scenes as Zal points out above, or the more traditional way of just making a GameManager.

ULTRA-simple static solution to a GameManager:

https://forum.unity.com/threads/i-need-to-save-the-score-when-the-scene-resets.1168766/#post-7488068

https://gist.github.com/kurtdekker/50faa0d78cd978375b2fe465d55b282b

OR for a more-complex "lives as a MonoBehaviour" solution...

Simple Singleton (UnitySingleton):

Some super-simple Singleton examples to take and modify:

Simple Unity3D Singleton (no predefined data):

https://gist.github.com/kurtdekker/775bb97614047072f7004d6fb9ccce30

Unity3D Singleton with a Prefab (or a ScriptableObject) used for predefined data:

https://gist.github.com/kurtdekker/2f07be6f6a844cf82110fc42a774a625

These are pure-code solutions, do not put anything into any scene, just access it via .Instance!

If it is a GameManager, when the game is over, make a function in that singleton that Destroys itself so the next time you access it you get a fresh one, something like:

Code (csharp):

1. public void DestroyThyself()
2. {
3.    Destroy(gameObject);
4.    Instance = null;    // because destroy doesn't happen until end of frame
5. }

There are also lots of Youtube tutorials on the concepts involved in making a suitable GameManager, which obviously depends a lot on what your game might need.

If you decide to go the additive scene loading route that is an entirely different approach. Here are some notes:

https://forum.unity.com/threads/right-way-for-performance-divide-scene.1023673/#post-6630961
https://forum.unity.com/threads/right-way-for-performance-divide-scene.1023673/#post-6754330

https://forum.unity.com/threads/problem-with-canvas-ui-prefabs.1039075/#post-6726169

A multi-scene loader thingy:

https://pastebin.com/Vecczt5Q

My typical Scene Loader:

https://gist.github.com/kurtdekker/862da3bc22ee13aff61a7606ece6fdd3

Other notes on additive scene loading:

https://forum.unity.com/threads/removing-duplicates-on-load-scene.956568/#post-6233406

Timing of scene loading:

https://forum.unity.com/threads/fun...ject-in-the-second-scene.993141/#post-6449718

Also, if something exists only in one scene, DO NOT MAKE A PREFAB out of it. It's a waste of time and needlessly splits your work between two files, the prefab and the scene, leading to many possible errors and edge cases.

Two similar examples of checking if everything is ready to go:

https://forum.unity.com/threads/daily-events-and-content-changes.1108202/#post-7143713

https://forum.unity.com/threads/uni...on-before-other-scripts.1153739/#post-7401794

 

use a game manager and a shared coincounting variable, i prefer to use singletons in this kind of issue