Adding a delay into the middle of a function in Unity

Question

In the spot //wait 1.5 seconds what would I say to make it wait 1.5 seconds then complete the code after?

Here is the code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class OnclickHeal : MonoBehaviour
{
    public PlayerHealth playerHealth;
    public PlayerMovement playerMovement;
    public Inventory Inventory;

    public Button healButton;

    void Start()
    {
        Button btn = healButton.GetComponent<Button>();
        btn.onClick.AddListener(TaskOnClick);
    }

    void TaskOnClick()
    {
        playerMovement.moveSpeed = 3;
        //wait 1.5 seconds
        playerMovement.moveSpeed = 4;
        playerHealth.currentHealth = 100;
    }
}

Also, the line public Button healButton; throws an error:

error CS0246: The type or namespace name 'Button' could not be found (are you missing a using directive or an assembly reference?)

Answer 1

Use the Invoke() function to call a function after a certain delay

Invoke("DoSomething", 1.5);//this will happen after a delay of 1.5 seconds

Where DoSomething is the name of the function that can be defined arbitrarily

void DoSomething() {
  //do nothing
  return;
}

If you want to read up on more documentation and how you can make better use of them than my naive approach, you can search for Unity Invoke() and Invoke Co-routines(DoSomething is a co-routine in the above example).

Answer 2

This is what Coroutines are for. A coroutine allows you to execute a method with breaks while the rest of the game continues running.

When you have a series of actions which are supposed to be executed with breaks, move them into a method which returns an IEnumerator.

You can now use the construct yield return WaitForSeconds(1.5f); in that method to add breaks to this method.

In order for these breaks to work, you have to run it as a coroutine with the method StartCoroutine(MethodName()).

void TaskOnClick() {
    StartCoroutine(ChangeMoveSpeed());
}

private IEnumerator ChangeMoveSpeed() {
    playerMovement.moveSpeed = 3;
    yield return WaitForSeconds(1.5f);
    playerMovement.moveSpeed = 4;
    playerHealth.currentHealth = 100;
}