How to add multiple yield return new wait for seconds inside an IEnumerator?

Questions & Answers
1

Hello

I’m working in a little app in Unity using UI, and I want to learn/know how to use the IEnumerator to stack multiple yield.

My goal is to use coroutines to disable UI elements after a short time pressing a button

This is my code so far:

using System.Collections;
using UnityEngine;

public class Script_EnableDisableGo : MonoBehaviour
{
    [Header("BackGround canvas")]
    public GameObject disableBg;

    [Header("ForeGround canvas")]
    public GameObject disableFg;

    [Header("Wait before disable")]
    public float timeToWait;

    public void DisableBackGroundCanvas()
    {
        StartCoroutine(Wait());
    }

    public void DisableForeGroundCanvas()
    {
        StartCoroutine(Wait());
    }

    IEnumerator Wait()
    {
        yield return new WaitForSeconds(timeToWait);
        disableBg.SetActive(false);

        yield return new WaitForSeconds(timeToWait);
        disableFg.SetActive(false);
    }
}

Main behaviour:

After pressing a button, a UI element shows and the previous get disabled, and after pressing another button the disabled UI element shows enabled

  • Main UI window is visible (press button) [wait
    for 1 sec] → New UI window is visible | Main UI
    window is disabled
  • New UI window is visible (press return
    button)[wait for 1 sec] → Main UI
    window is visible | New Ui window is disabled

When I run this coroutine, those elements are disabled at the same time, and I just want to disable one at a time

What am I doing wrong?

Help and feedback are very appreciated

2

From your code and your explanation of what you are attempting to do this is what I currently understand (correct me if I get anything wrong)

  1. You have 2 windows named MainWindow (activated) and NewWindow (deactivated).
  2. You have 2 buttons “Hide MainWindow Button” (enabled) and “Hide NewWindow Button” (disabled)
  3. When you press the MainWindow button you want to
  • Disable MainWindow button (where this is done is not defined)
  • Enable NewWindow button (where this is done is not defined)
  • Deactivate the MainWindow
  • wait one second
  • Activate the NewWindow
  • wait one second

4. When you press the NewWindow button you want to

  • Disable NewWindow button (where this is done is not defined)
  • Enable MainWindow button (where this is done is not defined)
  • Deactivate the NewWindow
  • wait one second
  • Activate the MainWindow
  • wait one second

Then it seems that all you need to do is this

using System.Collections;
using UnityEngine;

public class Script_EnableDisableGo : MonoBehaviour
{
    [Header("BackGround canvas")]
    public GameObject backGroundCanvas;  // main window???

    [Header("ForeGround canvas")]
    public GameObject foreGroundCanvas;  // new window???

    [Header("Wait before disable")]
    public float timeToWait;
    public void DisableBackGroundCanvas()
    {
        StopCoroutine("Wait");
        StartCoroutine(Wait(backGroundCanvas, foreGroundCanvas));
    }

    public void DisableForeGroundCanvas()
    {
        StopCoroutine("Wait");
        StartCoroutine(Wait(foreGroundCanvas, backGroundCanvas));
    }

    IEnumerator Wait(GameObject go1, GameObject go2)
    {
        yield return new WaitForSeconds(timeToWait);
        go1.SetActive(false);

        yield return new WaitForSeconds(timeToWait);
        go2.SetActive(true);
    }
}

Or instead of having two functions (DisableBackGroundCanvas/DisableForeGroundCanvas) you can do everything in one function like this (this also toggles the buttons)

using System.Collections;
using UnityEngine;
using UnityEngine.UI;

public class Script_EnableDisableGo : MonoBehaviour
{
    [Header("BackGround canvas")]
    public GameObject backGroundCanvas;

    [Header("ForeGround canvas")]
    public GameObject foreGroundCanvas;

    [Header("Main Window Button")]
    public Button MainWindowButton;     // rename this to your liking

    [Header("New Window Button")]
    public Button NewWindowButton;      // rename this to your liking

    [Header("Wait before disable")]
    public float timeToWait;

    public void DisableEnableWindows()  // rename this to your liking
    {
        if ((MainWindowButton != null) && (NewWindowButton != null))
        {
            MainWindowButton.enabled = !MainWindowButton.enabled;
            NewWindowButton.enabled = !NewWindowButton.enabled;
        }
        StopCoroutine("Wait");
        if (backGroundCanvas.activeSelf)
            StartCoroutine(Wait(backGroundCanvas, foreGroundCanvas));
        else
            StartCoroutine(Wait(foreGroundCanvas, backGroundCanvas));
    }

    IEnumerator Wait(GameObject go1, GameObject go2)
    {
        yield return new WaitForSeconds(timeToWait);
        go1.SetActive(false);

        yield return new WaitForSeconds(timeToWait);
        go2.SetActive(true);
    }
}