Trying to work with Coroutines, Need help with simple code

Questions & Answers
1

Hello. Im very new to Unity and c# aswell, so my answer is probably gonna be very dull !
Basically I have a text displayed on the screen and I’d like for a dot to appear and disappear constantly at the end of the text every 1 second.
I create a Ienumerator like this

IEnumerator Wait2() 
{
   // Add the dot at the end of the text
    text.text = (text.text + ".");
    Debug.Log("Added dot");
    // Wait 1 Second
    yield return new WaitForSeconds(1f * Time.deltaTime);
    // remove the dot
    text.text = text.text.Remove(text.text.Length - 1);
    Debug.Log("Removed dot");

and then simply execute it in my Update

void Start ()
{
text.text = "Hello?"; 
}


void Update () {

    StartCoroutine(Wait2());

}

But as a result I can see in the Debug Log that the dot gets added and deleted at the same time, without waiting the 1 second. I’ve been stuck on this for one day, please help me before I loose my mind.

3

Three things:

  1. What @gjf said.
  2. When using WaitForSeconds(time), you don’t have to multiply by Time.deltaTime since it’s just going to wait for whatever time you pass in. Multiplying by Time.deltaTime basically made your Coroutine wait for almost 0 seconds every time before continuing.
  3. After implementing what @gjf said, you will need a mechanism to have the coroutine keep repeating itself (if that is what you intended it to do). You can accomplish this by calling StartCoroutine on the coroutine itself at the end of the routine.

See my code below for a complete solution based off these three points.

Here is my code suggestion:

void Start()
{
    StartCoroutine(Wait2());
}
IEnumerator Wait2() 
{
    // Add the dot at the end of the text
    text.text = (text.text + ".");
    Debug.Log("Added dot");
    // Wait 1 Second
    yield return new WaitForSeconds(1f);
    // remove the dot
    text.text = text.text.Remove(text.text.Length - 1);
    Debug.Log("Removed dot");
    // Wait another 1 Second
    yield return new WaitForSeconds(1f);
    // Call the Coroutine to start again so it continuously loops
    StartCoroutine(Wait2());
}
2

Update() is called every frame so starting a coroutine is a very bad idea… if you want to perform actions with wait periods, start it from Start()/Awake()