Focus/center Scroll View to the specified point/item in Unity

ScrollViewFocusFunctions.cs

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

public static class ScrollViewFocusFunctions
{
	public static Vector2 CalculateFocusedScrollPosition( this ScrollRect scrollView, Vector2 focusPoint )
	{
		Vector2 contentSize = scrollView.content.rect.size;
		Vector2 viewportSize = ( (RectTransform) scrollView.content.parent ).rect.size;
		Vector2 contentScale = scrollView.content.localScale;

		contentSize.Scale( contentScale );
		focusPoint.Scale( contentScale );

		Vector2 scrollPosition = scrollView.normalizedPosition;
		if( scrollView.horizontal && contentSize.x > viewportSize.x )
			scrollPosition.x = Mathf.Clamp01( ( focusPoint.x - viewportSize.x * 0.5f ) / ( contentSize.x - viewportSize.x ) );
		if( scrollView.vertical && contentSize.y > viewportSize.y )
			scrollPosition.y = Mathf.Clamp01( ( focusPoint.y - viewportSize.y * 0.5f ) / ( contentSize.y - viewportSize.y ) );

		return scrollPosition;
	}

	public static Vector2 CalculateFocusedScrollPosition( this ScrollRect scrollView, RectTransform item )
	{
		Vector2 itemCenterPoint = scrollView.content.InverseTransformPoint( item.transform.TransformPoint( item.rect.center ) );

		Vector2 contentSizeOffset = scrollView.content.rect.size;
		contentSizeOffset.Scale( scrollView.content.pivot );

		return scrollView.CalculateFocusedScrollPosition( itemCenterPoint + contentSizeOffset );
	}

	public static void FocusAtPoint( this ScrollRect scrollView, Vector2 focusPoint )
	{
		scrollView.normalizedPosition = scrollView.CalculateFocusedScrollPosition( focusPoint );
	}

	public static void FocusOnItem( this ScrollRect scrollView, RectTransform item )
	{
		scrollView.normalizedPosition = scrollView.CalculateFocusedScrollPosition( item );
	}

	private static IEnumerator LerpToScrollPositionCoroutine( this ScrollRect scrollView, Vector2 targetNormalizedPos, float speed )
	{
		Vector2 initialNormalizedPos = scrollView.normalizedPosition;

		float t = 0f;
		while( t < 1f )
		{
			scrollView.normalizedPosition = Vector2.LerpUnclamped( initialNormalizedPos, targetNormalizedPos, 1f - ( 1f - t ) * ( 1f - t ) );

			yield return null;
			t += speed * Time.unscaledDeltaTime;
		}

		scrollView.normalizedPosition = targetNormalizedPos;
	}

	public static IEnumerator FocusAtPointCoroutine( this ScrollRect scrollView, Vector2 focusPoint, float speed )
	{
		yield return scrollView.LerpToScrollPositionCoroutine( scrollView.CalculateFocusedScrollPosition( focusPoint ), speed );
	}

	public static IEnumerator FocusOnItemCoroutine( this ScrollRect scrollView, RectTransform item, float speed )
	{
		yield return scrollView.LerpToScrollPositionCoroutine( scrollView.CalculateFocusedScrollPosition( item ), speed );
	}
}

How To

After adding the above C# script to your project, simply call scrollView.FocusOnItem( targetItem ). To focus on that item smoothly, call StartCoroutine( scrollView.FocusOnItemCoroutine( targetItem, focusSpeed ) ). Don't call FocusOnItemCoroutine every frame, wait for it to finish first.

Huge help. Thanks!

Wow

Thanks a lot for sharing this. Great!!!

Thank you! I had my own system, but yours is more accurate

Thank you, You are awesome man

Really nice thank you !
for those who want to chain up scroll coroutine and cancel the previous one to avoid glitches.
here are some new coroutine functions

	public static bool cancelOutPreviousCoroutine = false;
	public static int runningLerpCoroutine = 0;
	private static IEnumerator LerpToScrollPositionCoroutine( this ScrollRect scrollView, Vector2 targetNormalizedPos, float speed )
	{
		Vector2 initialNormalizedPos = scrollView.normalizedPosition;

		float t = 0f;
		while( t < 1f )
		{
			
			scrollView.normalizedPosition = Vector2.LerpUnclamped( initialNormalizedPos, targetNormalizedPos, 1f - ( 1f - t ) * ( 1f - t ) );

			yield return null;
			t += speed * Time.unscaledDeltaTime;
			
			if (cancelOutPreviousCoroutine) {
				t = 1;
				cancelOutPreviousCoroutine = false;
			}
		
			if (t < 1f) {
				scrollView.normalizedPosition = targetNormalizedPos;
			}
		}
		
		runningLerpCoroutine--;
	}

	public static IEnumerator FocusAtPointCoroutine( this ScrollRect scrollView, Vector2 focusPoint, float speed )
	{
		if (runningLerpCoroutine > 0) cancelOutPreviousCoroutine = true;
		runningLerpCoroutine++;
		yield return scrollView.LerpToScrollPositionCoroutine( scrollView.CalculateFocusedScrollPosition( focusPoint ), speed );
	}

	public static IEnumerator FocusOnItemCoroutine( this ScrollRect scrollView, RectTransform item, float speed )
	{
		if (runningLerpCoroutine > 0) cancelOutPreviousCoroutine = true;
		runningLerpCoroutine++;
		yield return scrollView.LerpToScrollPositionCoroutine( scrollView.CalculateFocusedScrollPosition( item ), speed );
	}

I can't express how I thank you. This works just perfect! Thank you very much.

Thanks

Great. thank you

Hello sir, I'd like to use your code but there is no license could you please add one when you have time :)

Thank you

@gimpycpu Hi! Feel free to use it under MIT License.