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quaternioninterpolation/ImageDOCrossfade.cs

Last active October 7, 2025 09:35
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DOTween UnityEngine.UI.Image image cross fade
Raw
readme.md

DOTween Unity UI Image Crossfade

Just a quick hack to fade between UI Image sprites. I whipped up a quick shader for optimization but didn't have time to adjust it to fix sprites of different ratios when the Image component used Preserve Aspect Ratio

Works as is, simple and easy.

Here's an example of some cat pictures I found.

Crossfading Cattos

Example of usage

Sprite myNextSprite; // Assuming this is set
const float duration = 0.3f; // 300ms animation duration

myImage.DOKill(); // It's a good idea to kill off previous animations
myImage.DOCrossfadeImage(myNextSprite, duration, () =>
{
    //A callback for when complete. Just a hacky way of getting a callback.
    // NOTE: Will not be called if killed.
    Debug.Log("Crossfade animation completed successfully");
});

MIT License

Go ahead and use it for whatever and stuff. If you improve it please feel free to let me know and I'll update this so we can all give a little back to the community.

Raw
ImageDOCrossfade.cs
using UnityEngine;
using DG.Tweening;
using UnityEngine.UI;
public static class ImageDOCrossfade
{
private static Image CreateTempChildImage(Image image)
{
Image result = null;
string tempChildName = GetTempChildName(image);
Transform foundTransform = image.transform.Find(tempChildName);
GameObject tempGo = foundTransform != null ? foundTransform.gameObject : null;
if (tempGo == null)
{
tempGo = new GameObject("TempCloneChild");
var rt = image.GetComponent<RectTransform>();
var rtPrime = tempGo.AddComponent<RectTransform>();
rtPrime.SetParent(rt);
rtPrime.localScale = Vector3.one;
rtPrime.anchorMin = Vector2.zero;
rtPrime.anchorMax = Vector2.one;
rtPrime.sizeDelta = Vector2.zero;
rtPrime.anchoredPosition = Vector2.zero;
result = tempGo.AddComponent<Image>();
result.preserveAspect = image.preserveAspect;
}
else
{
result = tempGo.GetComponent<Image>();
}
return result;
}
private static string GetTempChildName(Image target) => string.Format("TempCloneChild_{0}", target.GetInstanceID());
public static float GetAlpha(this Image image) => image.color.a;
public static void SetAlpha(this Image image, float alpha)
{
var color = image.color;
color.a = alpha;
image.color = color;
}
private static void RemoveTempChildImage(Image childImage)
{
if (childImage != null)
{
Object.Destroy(childImage.gameObject);
}
}
public static Tweener DOCrossfadeImage(this Image image, Sprite to, float duration, System.Action OnComplete = null)
{
Image childImage = CreateTempChildImage(image);
float progress = 0f;
const float finalAlpha = 1f;
childImage.SetAlpha(0f);
childImage.sprite = to;
return DOTween.To(
() => progress,
(curProgress) =>
{
progress = curProgress;
float childAlpha = finalAlpha * progress;
float imageAlpha = finalAlpha - childAlpha;
image.SetAlpha(imageAlpha);
childImage.SetAlpha(childAlpha);
},
1f, duration)
.OnComplete(() =>
{
image.sprite = to;
image.SetAlpha(childImage.GetAlpha());
RemoveTempChildImage(childImage);
OnComplete?.Invoke();
})
.OnKill(() =>
{
//Note: If you expect this tween will cancel and wish to halt the
// animation, remove this next line. It will look bad when you
// start another CrossFadeImage animation on this
RemoveTempChildImage(childImage);
});
}
}
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