RectTransformのAnchorのプリセットをスクリプトから「インスペクタ上のenumと同じように」 指定する為の拡張クラス

AnchorPreset.cs

using UnityEngine;

/// <summary>
/// RectTransformのAnchorのプリセットをスクリプトから「インスペクタ上のenumと同じように」
/// 指定する為の拡張クラス
/// プロジェクト内の適当な場所に保存しておくと、以下のようにRectTransformに対してSetAnchor()メソッドが使えるようになる
/// </summary>

/* usage
  var rect = GetComponent<RectTransform>();
  rect.SetAnchor(AnchorPresets.MiddleCenter);
  rect.localPosition = Vector3.zero;
  */
public enum AnchorPresets
{
    TopLeft,
    TopCenter,
    TopRight,

    MiddleLeft,
    MiddleCenter,
    MiddleRight,

    BottomLeft,
    BottonCenter,
    BottomRight,
    BottomStretch,

    VertStretchLeft,
    VertStretchRight,
    VertStretchCenter,

    HorStretchTop,
    HorStretchMiddle,
    HorStretchBottom,

    StretchAll
}

public enum PivotPresets
{
    TopLeft,
    TopCenter,
    TopRight,

    MiddleLeft,
    MiddleCenter,
    MiddleRight,

    BottomLeft,
    BottomCenter,
    BottomRight,
}

public static class RectTransformExtensions
{
    public static void SetAnchor(this RectTransform source, AnchorPresets allign, int offsetX = 0, int offsetY = 0)
    {
        source.anchoredPosition = new Vector3(offsetX, offsetY, 0);

        switch (allign)
        {
            case (AnchorPresets.TopLeft):
                {
                    source.anchorMin = new Vector2(0, 1);
                    source.anchorMax = new Vector2(0, 1);
                    break;
                }
            case (AnchorPresets.TopCenter):
                {
                    source.anchorMin = new Vector2(0.5f, 1);
                    source.anchorMax = new Vector2(0.5f, 1);
                    break;
                }
            case (AnchorPresets.TopRight):
                {
                    source.anchorMin = new Vector2(1, 1);
                    source.anchorMax = new Vector2(1, 1);
                    break;
                }

            case (AnchorPresets.MiddleLeft):
                {
                    source.anchorMin = new Vector2(0, 0.5f);
                    source.anchorMax = new Vector2(0, 0.5f);
                    break;
                }
            case (AnchorPresets.MiddleCenter):
                {
                    source.anchorMin = new Vector2(0.5f, 0.5f);
                    source.anchorMax = new Vector2(0.5f, 0.5f);
                    break;
                }
            case (AnchorPresets.MiddleRight):
                {
                    source.anchorMin = new Vector2(1, 0.5f);
                    source.anchorMax = new Vector2(1, 0.5f);
                    break;
                }

            case (AnchorPresets.BottomLeft):
                {
                    source.anchorMin = new Vector2(0, 0);
                    source.anchorMax = new Vector2(0, 0);
                    break;
                }
            case (AnchorPresets.BottonCenter):
                {
                    source.anchorMin = new Vector2(0.5f, 0);
                    source.anchorMax = new Vector2(0.5f, 0);
                    break;
                }
            case (AnchorPresets.BottomRight):
                {
                    source.anchorMin = new Vector2(1, 0);
                    source.anchorMax = new Vector2(1, 0);
                    break;
                }

            case (AnchorPresets.HorStretchTop):
                {
                    source.anchorMin = new Vector2(0, 1);
                    source.anchorMax = new Vector2(1, 1);
                    break;
                }
            case (AnchorPresets.HorStretchMiddle):
                {
                    source.anchorMin = new Vector2(0, 0.5f);
                    source.anchorMax = new Vector2(1, 0.5f);
                    break;
                }
            case (AnchorPresets.HorStretchBottom):
                {
                    source.anchorMin = new Vector2(0, 0);
                    source.anchorMax = new Vector2(1, 0);
                    break;
                }

            case (AnchorPresets.VertStretchLeft):
                {
                    source.anchorMin = new Vector2(0, 0);
                    source.anchorMax = new Vector2(0, 1);
                    break;
                }
            case (AnchorPresets.VertStretchCenter):
                {
                    source.anchorMin = new Vector2(0.5f, 0);
                    source.anchorMax = new Vector2(0.5f, 1);
                    break;
                }
            case (AnchorPresets.VertStretchRight):
                {
                    source.anchorMin = new Vector2(1, 0);
                    source.anchorMax = new Vector2(1, 1);
                    break;
                }

            case (AnchorPresets.StretchAll):
                {
                    source.anchorMin = new Vector2(0, 0);
                    source.anchorMax = new Vector2(1, 1);
                    break;
                }
        }
    }

    public static void SetPivot(this RectTransform source, PivotPresets preset)
    {

        switch (preset)
        {
            case (PivotPresets.TopLeft):
                {
                    source.pivot = new Vector2(0, 1);
                    break;
                }
            case (PivotPresets.TopCenter):
                {
                    source.pivot = new Vector2(0.5f, 1);
                    break;
                }
            case (PivotPresets.TopRight):
                {
                    source.pivot = new Vector2(1, 1);
                    break;
                }

            case (PivotPresets.MiddleLeft):
                {
                    source.pivot = new Vector2(0, 0.5f);
                    break;
                }
            case (PivotPresets.MiddleCenter):
                {
                    source.pivot = new Vector2(0.5f, 0.5f);
                    break;
                }
            case (PivotPresets.MiddleRight):
                {
                    source.pivot = new Vector2(1, 0.5f);
                    break;
                }

            case (PivotPresets.BottomLeft):
                {
                    source.pivot = new Vector2(0, 0);
                    break;
                }
            case (PivotPresets.BottomCenter):
                {
                    source.pivot = new Vector2(0.5f, 0);
                    break;
                }
            case (PivotPresets.BottomRight):
                {
                    source.pivot = new Vector2(1, 0);
                    break;
                }
        }
    }
}