安全的设置锚点，并保证位置不变

```

public enum AnchorPresets
    {
        TopLeft,
        TopCenter,
        TopRight,

MiddleLeft,
        MiddleCenter,
        MiddleRight,

BottomLeft,
        BottonCenter,
        BottomRight,
        BottomStretch,

VertStretchLeft,
        VertStretchRight,
        VertStretchCenter,

HorStretchTop,
        HorStretchMiddle,
        HorStretchBottom,

StretchAll
    }

/// <summary>
/// 安全的设置锚点，并保证位置不变
/// </summary>
/// <param name="source"></param>
/// <param name="allign"></param>
public static void SetAnchor(this RectTransform source, AnchorPresets allign)
{
    //计算原锚点中心和组件大小
    Vector2 oldAnchorCenter = (source.anchorMin + source.anchorMax) / 2;
    Vector2 oldAnchoredPos = source.anchoredPosition;
    Vector2 objSize = new Vector2(source.rect.width, source.rect.height);
    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;
            }
    }

source.sizeDelta = objSize; //调整大小
                                   //计算偏移量
    RectTransform rectTrans_Father = source.parent as RectTransform; //获取父对象

Vector2 anchorCenter = (source.anchorMin + source.anchorMax) / 2;
    Vector2 deltaAnchor = anchorCenter - oldAnchorCenter;
    Vector2 deltaMove = new Vector2(deltaAnchor.x * rectTrans_Father.rect.width, deltaAnchor.y * rectTrans_Father.rect.height);
    source.anchoredPosition = oldAnchoredPos - deltaMove; //调整距离锚点的位置
}
```

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