How to make a live counter in unity3d

Question

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 :)

Answer 1

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/