unity RectTransform怎么通过localPosition计算得到anchoredPosition

转自localPosition与anchoredPosition转化

证明过程见出处。

把下面代码复制到unity里面，就可以了。

RectTransform rect = GetComponent<RectTransform>();

    RectTransform parentRect = transform.parent.GetComponent<RectTransform>();

    Vector2 GetAnchoredPositionByLocalPosition()

    {

        // 通过OffsetMin、OffsetMax，将anchoredPosition和localPosition联系起来

        Vector2 localPosition2D = new Vector2(rect.localPosition.x, rect.localPosition.y);

        Vector2 anchorMinPos = parentRect.rect.min + Vector2.Scale(rect.anchorMin, parentRect.rect.size);

        Vector2 rectMinPos = rect.rect.min + localPosition2D;

        Vector2 offsetMin = rectMinPos - anchorMinPos;

        Vector2 anchorMaxPos = parentRect.rect.max - Vector2.Scale(Vector2.one - rect.anchorMax, parentRect.rect.size);

        Vector2 rectMaxPos = rect.rect.max + localPosition2D;

        Vector2 offsetMax = rectMaxPos - anchorMaxPos;

        Vector2 sizeDelta = offsetMax - offsetMin;

        Vector2 anchoredPosition = offsetMin + Vector2.Scale(sizeDelta, rect.pivot);

        return anchoredPosition;

    }