Wait for a bool to be true

Unity Engine
1

Hello.

i have a for loop that loop through an array to look if it’s ready by a bool function.

inside this bool function i need to wait untill another bool become tru to continue and return true…

i’m wondering…to how is the best way to do this.

2

Is all of that supposed to happen on the main thread? You could then take a look at coroutines and the variety of yield instructions. Generally, you can also implement the logic in Update, but I could imagine it’ll be more straight forward in a coroutine.

3

Can you not do something similar like that?

bool outputBoolB = false ;
if ( waitingForBoolA )
{
    outputBoolB = DoSomething () ;
}
4 
public class MyClassA
{
    private MyClassB _myClassB = new MyClassB();
    private bool IsReadyToContinue()
    {

        // i need to wait "isReady" here
        // then return true


        return false;
    }

}

public class MyClassB
{
    public bool isReady;


    private void DoSomething()
    {
        // load resources and change the bool to true

        isReady = true;
    }
}

this is what i mean…

5

Unity - Scripting API: WaitUntil You could use WaitUntil. The other option would be just execute the code when you would normally set the bool to true instead.

6 
//Useful when we want to hold a IEnumerator method which is using for/while loop until the passed "checkMethod" returns true
//It is needed coz in IEnumerator method we cant pass boolean variable by reference


using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using kFramework;
public class CoroutineLoopTest : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine(WrongWayToPauseLoop());
        StartCoroutine(CorrectWayToPauseLoop());
    }
    // Update is called once per frame
    IEnumerator WrongWayToPauseLoop()
    {
        print("Start");
        int index = 0;
        while (index <= 20)
        {
            //This will not stop while loop or for loop
            yield return null;
            print("WrongWay Index= " + index);
            index++;
        }
        print("End");
    }
    IEnumerator CorrectWayToPauseLoop()
    {
        print("Start");
        int index = 0;
        while (index <= 20)
        {
            //Hold the coroutine loop until space button is clicked
            yield return WaitUntilTrue(IsSpaceKeyPressed);
            print("CorrectWay Index= " + index);
            index++;
        }
        print("End");
    }
    bool IsSpaceKeyPressed()
    {
        return Input.GetKeyDown(KeyCode.Space);
    }

       public IEnumerator WaitUntilTrue(Func<bool> checkMethod)
        {
            while (checkMethod() == false)
            {
                yield return null;
            }
        }


}
1 Like