Why doesnt my coroutine ever end?

Questions & Answers
1

Hi there. I wanted to use a Coroutine to make my game pause for a couple seconds whilst the players state changes (eg. Small or big player like in Super Mario).

Everything looks fine to me after studying the docs, but the code after the coroutine which I wanted to use to unpause the game never gets called and the game stays paused:

    void SwitchPowerStates(PowerState newState)
    {
        currentPowerState = newState;

        switch (currentPowerState)
        {
            case PowerState.SMALL:
                {
                    // code that changes the size
                    break;
                }
            case PowerState.BIG:
                {
                    // code that changes the size
                    break;
                }
        }

        StartCoroutine(PauseAndWaitFiveSecs(2f));
        Debug.Log("this gets called before the coroutine is started");
    }


    void PauseGame()
    {
        Time.timeScale = 0f;
    }

    void UnPauseGame()
    {
        Time.timeScale = 1f;
    }


    IEnumerator PauseAndWaitFiveSecs(float waitTime)
    {
        PauseGame();
        Debug.Log("before time = " + Time.time);
        yield return new WaitForSeconds(waitTime);
        // WHY IS NONE OF THE FOLLOWING CODE CALLED???
        Debug.Log("after time = " + Time.time); // doesnt happen?
        UnPauseGame(); // doesnt happen?
    }

I commented the area of code where I expected to be able to unpause the game. I think i included all the relevant code.

Really hope someone can help me.

Thanks

2

Well I believe you read the document carefully but maybe you not mentioned this point.

The actual time suspended is equal to the given time multiplied by Time.timeScale. See WaitForSecondsRealtime if you wish to wait using unscaled time.

The WaitForSeconds yield is base on Time.time to count (If I not wrong) so when you set Time.timeScale to 0 in your pause function, then the Time.time will just stop at the moment, the time counter inside the WaitForSeconds will never reach waitTime. So instead of using WaitForSeconds, you should use WaitForSecondsRealtime.

One more thing I think I have to mentioned you is that if you pause by set Time.TimeScale to 0, all object of your games will stop FixedUpdate, so you have to be careful with this approach. Since I don’t know what you decide to implement so I just can advice this.

Hope this help. Cheers!!

3

Setting the time scale to 0 affects all game time dependent things which includes Time.deltaTime, Time.time and WaitForSeconds as well. You can use “WaitForSecondsRealtime” instead.