1

I’m trying to make a UI turn signal indicator using a UI image that I want to blink on and off with a click, click sound.
I can do it with an animation but is there a C# method that is a better way to do this so that when the game object is set active it will be blinking and making the classic “Click, Click” sound of a turn signal indicator?

3

I did something similar and made a Blink.cs class. Then attached it to whatever UI object I wanted to blink. Change the timing with the interval, etc. In this example, I just used AudioSource.PlayClipAtPoint to play your specified AudioClip at world origin.

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

// this toggles a component (usually an Image or Renderer) on and off for an interval to simulate a blinking effect
public class Blink : MonoBehaviour {

	// this is the UI.Text or other UI element you want to toggle
	public MaskableGraphic imageToToggle;

	public float interval = 1f;
	public float startDelay = 0.5f;
	public bool currentState = true;
	public bool defaultState = true;
	bool isBlinking = false;

	public AudioClip clip;

	void Start()
	{
		imageToToggle.enabled = defaultState;
		StartBlink();
	}

	public void StartBlink()
	{
		// do not invoke the blink twice - needed if you need to start the blink from an external object
		if (isBlinking)
			return;

		if (imageToToggle !=null)
		{
			isBlinking = true;
			InvokeRepeating("ToggleState", startDelay, interval);
		}
	}

	public void ToggleState()
	{
		imageToToggle.enabled = !imageToToggle.enabled;

		// plays the clip at (0,0,0)
		if (clip)
			AudioSource.PlayClipAtPoint(clip,Vector3.zero);
	}
	
}
4

You can use Coroutine to achieve this.
It would go something like this

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

public class BlinkingImage : MonoBehaviour {

    Image image;

	void Start ()
    {
        image = GetComponent<Image>();
        StartBlinking();
	}


    IEnumerator Blink()
    {
        while (true)
        {
            switch(image.color.a.ToString())
            {
                case "0":
                    image.color = new Color(image.color.r, image.color.g, image.color.b, 1);
                    //Play sound
                    yield return new WaitForSeconds(0.5f);
                    break;
                case "1":
                    image.color = new Color(image.color.r, image.color.g, image.color.b, 0);
                    //Play sound
                    yield return new WaitForSeconds(0.5f);
                    break;
            }
        }
    }

    void StartBlinking()
    {
        StopAllCoroutines();
        StartCoroutine("Blink");
    }

    void StopBlinking()
    {
        StopAllCoroutines();
    }
    
}
2

You can start a Coroutine, that toggle the alpha of your object and reproduce the sound then wait the time that you need.

5

Thanks @wilmer_lin and @RadioKnife Both of these were excellent answers and I loved them both. I ultimately could only choose one answer as the correct one even though they are both correct and both work. I ended up choosing the top answer simply because of the ease of use with the inspector values of being able to drag and drop and tweak parameters in the inspector.

I awarded points to both of you though because such help was well deserved on both parts,
Much MUCH thanks guys :slight_smile: