Wsrtjtyk

I recently started using Unity3D and made a few levels.
The only problem I have right now is how can I get a live counter?

So my character dies when he hits and certain object.

I want my character to get 3 lives maximum, and get -1 live when he hits that object.

And that it keeps the data when he dies so you wouldn't get lives back if you restart the app.
And after a certain amount of minutes he gets +1 live.

Thank you :)

You can use PlayerPrefs.SetInt , PlayerPrefs.GetInt for storing and reading your player's hp in file storage. Read more about it here:

https://docs.unity3d.com/ScriptReference/PlayerPrefs.html

As for Giving player +1 hp after a few minutes you can store DateTime.Now in a PlayerPrefs variable whenever you give your player some hp and use TimeSpan and TotalMinutesPassed:

TimeSpan passedTime = DateTime.Now - lastStoredDateTime;

int totalMinutesPassed = passedTime.TotalMinutes;

Should go sth like this i guess(didnt test this code just showing a general idea) :

void SetPlayerLives(int lives)

{

    playerLives = lives;

    PlayerPrefs.SetInt("player-lives",playerLives);

}

//TODO: also sth like => int GetPlayerLives() function

void CheckLiveRegen() //call this function whenever you want to check live regen:

{

    int LIVE_REGEN_MINUTES = 5; //regen 1 live every 5 minutes

    DateTime lastStoredDateTime = DateTime.Parse(PlayerPrefs.GetString("last-live-regen", DateTime.Now.ToString()));

    TimeSpan passedTime = DateTime.Now - lastStoredDateTime;

    double totalMinutesPassed = passedTime.TotalMinutes;

    if(totalMinutesPassed >= LIVE_REGEN_MINUTES) 

    {

        int val = (int) totalMinutesPassed / LIVE_REGEN_MINUTES;

        // Add val to your player lives! + store new lives value

        SetPlayerLives(playerLives+val);

        //update last-live-regen value:

        PlayerPrefs.SetString("last-live-regen", DateTime.Now.ToString());

    }

}

Note: DateTime , TimeSpan classes have some bugs (specially in android platform) in versions older than 2017.4 (LTS) Make sure you log values and check if functions are working properly.
https://forum.unity.com/threads/android-datetime-now-is-wrong.488380/

While your game running. just create a variable counterTime to count time, whenever counterTime pass certain amount of time you want reset counterTime to 0 and increase your life.
When user quit your app, save last time to PlayerPref, eg:

PlayerPref.SaveString("LastTime", DateTime.Now);

When user comback game, just check duration between last time and now to calculate total life need added. eg:

DateTime lastTime = DateTime.Parse(PlayerPref.GetString("LastTime"));

TimeSpan timeDif= DateTime.Now - lastTime;

int duration = timeDif.TotalSeconds;