In Unity, how do I set up a delay before an action?

Question

I want an object to rotate after a delay. I tried using StartCoroutine, yield and WaitForSeconds, but failed. How can I do it?

Answer 1

You could create a variable for example called timer of type float and make it equal to the amount of seconds you would like to wait, then in the Update() function subtract Time.deltaTime from your timer variable. Afterwards use if statement to check if the timer variable is equal to zero, if so rotate the object.

Answer 2

Multiple choices, but you will have to use Coroutine sometimes, so try to figure out why its not working here.

My tips : careful to not call StartCoroutine in Update() without protection.

Exemple:

private bool enter = false;

Update() {
    if (enter == false)
        StartCoroutine(your_timer());
}

IEnumerator your_timer() {
    enter = true;
    Debug.Log("Your enter Coroutine at" + Time.time);
    yield return new WaitForSeconds(2.0f);
    enter = false;
}

Answer 3

From here

public void Invoke(string methodName, float time);

Invokes the method methodName in time seconds.

There is a restriction that the method needs to take no parameters and return void, so you should wrap your rotation in another function, like so:

void delayedRotation() {
    transform.Rotate (new Vector3 (0, 0, 1) * Time.deltaTime);
}

and then adjust your code:

if (isRolling) 
{
    transform.position += new Vector3 (0,1,2)
    Invoke("delayedRotation", 0.5f);
} 

Answer 4

void Update(){
    if(INSERT_CONDITION_HERE){


        StartCoroutine(Timer);
     }
}

Then

IEnumerator Timer(){
    yield return new WaitForSeconds(Time);
    CODEGOESHERE
}