EASY FIX! How to make the screen flash for only a few seconds?

Questions & Answers
1

this script works but It stays stuck on red , I want it to flash/blink the red for a few second sonly each time not stay on the red.
please help me fix my code
thanks

c# 2d
this is code in the beginning only…

	public Slider healthSlider;   // Reference to the UI's health bar.
	public Image damageImage;  // Reference to an image to flash on the screen on being hurt.
	public float flashSpeed = 5f;  // The speed the damageImage will fade at.
	public Color flashColour = new Color(1f, 0f, 0f, 0.1f); // The colour the damageImage is set to, to flash.







=====================

this is code below regarding the if /else statement

}
			}
			else
			{
				// do something if not correct - for example
				currentWord = 0; // force restart
				damageImage.color = flashColour;
				damageImage.color = Color.Lerp (damageImage.color, Color.clear, flashSpeed * Time.deltaTime);
				//Destroy(gameObject, 1); // magic door closes - remove object
			}
		}
2

You’re setting the color to “flashColour” (misspelled Color, btw) before using your Color.lerp (which will overwrite that).
Besides that, you’re always lerping to Color.clear (Transparent color). That’s only half a single “blink”.

I would make a Coroutine to lerp from a color to another over a period of time. Then I would put this inside a for-loop on another coroutine. You can call this function as an “event”. You would not call this on your update.
Here’s an example of how I would do this:

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

[RequireComponent(typeof(Image))]
public class ErrorBlink : MonoBehaviour
{
    Image blinkImage;
    Color startColor;

    void Start()
    {
        blinkImage = GetComponent<Image>();
        startColor = blinkImage.color;
    }

    public void BlinkRed()
    {
        StartCoroutine(Blink(Color.red, 5, 1));
    }

    public IEnumerator ColorLerpTo(Color _color, float _duration)
    {
        float elapsedTime = 0.0f;
        while (elapsedTime < _duration)
        {
            blinkImage.color = Color.Lerp(blinkImage.color, _color, (elapsedTime / _duration));
            elapsedTime += Time.deltaTime;
            yield return new WaitForEndOfFrame();
        }
    }

    public IEnumerator Blink(Color _blinkIn, int _blinkCount, float _totalBlinkDuration)
    {
        // We divide the whole duration for the ammount of blinks we will perform
        float fractionalBlinkDuration = _totalBlinkDuration / _blinkCount;

        for (int blinked = 0; blinked < _blinkCount; blinked++)
        {
            // Each blink needs 2 lerps: we give each lerp half of the duration allocated for 1 blink
            float halfFractionalDuration = fractionalBlinkDuration * 0.5f;

            // Lerp to the color
            yield return StartCoroutine(ColorLerpTo(_blinkIn, halfFractionalDuration));

            // Lerp to transparent
            StartCoroutine(ColorLerpTo(Color.clear, halfFractionalDuration));
        }
    }
}

The cool thing about this, is that you can put it on a different Class and attach it to whatever you want to. Feel free to adapt my code to whatever you need.

Enjoy !

3

This is an easy one. You do not need two coroutines. First add this to the list of public variables in your class

public int numFlashes = 4;
public float timeBetweenFlash = 0.5f;
public Color flashColor = Color.red;

Now add this coroutine

IEnumerator FlashInput(InputField input)
{
    // save the InputField.textComponent color
    Color defaultColor = input.textComponent.color;
    for (int i = 0; i < numFlashes; i++)
    {
        // if the current color is the default color - change it to the flash color
        if (input.textComponent.color == defaultColor)
        {
            input.textComponent.color = flashColor;
        }
        else // otherwise change it back to the default color
        {
            input.textComponent.color = defaultColor;
        }
        yield return new WaitForSeconds(timeBetweenFlash);
    }
    Destroy(input.gameObject, 1); // magic door closes - remove object
    yield return new WaitForSeconds(1);
}

Now just replace everything in your else block with this line

StartCoroutine(FlashInput(input));
4

mavina ye s u right I was going to task u but I spent a couple hours and figured that out a couple days ago, when u send me the global I couldn’t create other scripts then I read the error and realized I would comment it out and it worked so yes I realized I can only use 1 at a time

is there any way to allow it on them all though it s a pain to go back and forth and comment them out constantly