这个工具主要是用于动态生成UI的情况。项目中我们通过配置UI的锚点、位置以及大小(位置、大小都是通过蓝湖看到的)，然后通过代码动态生成UI。
大部分情况下只要合理设置锚点，那么生成出来的UI就已经满足了适配的要求。
csharp
using UnityEngine;
public static class RectTransUtility
{
/// <summary>
/// 左上 (0.0, 1.0)
/// </summary>
public static readonly Vector2 TopLeftVector = new(0.0f, 1.0f);
/// <summary>
/// 上中 (0.5, 1.0)
/// </summary>
public static readonly Vector2 TopCenterVector = new(0.5f, 1.0f);
/// <summary>
/// 右上 (1.0, 1.0)
/// </summary>
public static readonly Vector2 TopRightVector = new(1.0f, 1.0f);
/// <summary>
/// 左中 (0.0, 0.5)
/// </summary>
public static readonly Vector2 MiddleLeftVector = new(0.0f, 0.5f);
/// <summary>
/// 中心 (0.5, 0.5)
/// </summary>
public static readonly Vector2 MiddleCenterVector = new(0.5f, 0.5f);
/// <summary>
/// 右中 (1.0, 0.5)
/// </summary>
public static readonly Vector2 MiddleRightVector = new(1.0f, 0.5f);
/// <summary>
/// 左下 (0.0, 0.0)
/// </summary>
public static readonly Vector2 BottomLeftVector = new(0.0f, 0.0f);
/// <summary>
/// 下中 (0.5, 0.0)
/// </summary>
public static readonly Vector2 BottomCenterVector = new(0.5f, 0.0f);
/// <summary>
/// 右下 (1.0, 0.0)
/// </summary>
public static readonly Vector2 BottomRightVector = new(1.0f, 0.0f);
/// <summary>
/// 设置位置与大小
/// </summary>
public static void SetRTPosition(RectTransform rt, ERectTransAnchor anchor_pivot, float x, float y, float width, float height)
{
//设置锚点和轴心点
SetRTAnchorAndPivot(rt, anchor_pivot);
switch (anchor_pivot)
{
case ERectTransAnchor.TopLeft:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Left, x, width);
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Top, y, height);
return;
case ERectTransAnchor.TopCenter:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Top, y, height);
rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, width);
rt.anchoredPosition = new Vector2(x, rt.anchoredPosition.y);
return;
case ERectTransAnchor.TopRight:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Right, x, width);
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Top, y, height);
return;
case ERectTransAnchor.MiddleLeft:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Left, x, width);
rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, height);
rt.anchoredPosition = new Vector2(rt.anchoredPosition.x, y);
return;
case ERectTransAnchor.MiddleCenter:
rt.sizeDelta = new Vector2(width, height);
rt.anchoredPosition = new Vector2(x, y);
return;
case ERectTransAnchor.MiddleRight:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Right, x, width);
rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, height);
rt.anchoredPosition = new Vector2(rt.anchoredPosition.x, y);
return;
case ERectTransAnchor.BottomLeft:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Left, x, width);
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Bottom, y, height);
return;
case ERectTransAnchor.BottomCenter:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Bottom, y, height);
rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, width);
rt.anchoredPosition = new Vector2(x, rt.anchoredPosition.y);
return;
case ERectTransAnchor.BottomRight:
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Right, x, width);
rt.SetInsetAndSizeFromParentEdge(RectTransform.Edge.Bottom, y, height);
return;
}
Debug.LogWarning("[RectTransUtility.SetRTPosition] 暂不支持的锚点类型！");
}
/// <summary>
/// 设置锚点和轴心点
/// </summary>
public static void SetRTAnchorAndPivot(RectTransform rt, ERectTransAnchor anchor_pivot)
{
switch (anchor_pivot)
{
case ERectTransAnchor.TopLeft:
rt.anchorMin = TopLeftVector;
rt.anchorMax = TopLeftVector;
rt.pivot = TopLeftVector;
return;
case ERectTransAnchor.TopCenter:
rt.anchorMin = TopCenterVector;
rt.anchorMax = TopCenterVector;
rt.pivot = TopCenterVector;
return;
case ERectTransAnchor.TopRight:
rt.anchorMin = TopRightVector;
rt.anchorMax = TopRightVector;
rt.pivot = TopRightVector;
return;
case ERectTransAnchor.MiddleLeft:
rt.anchorMin = MiddleLeftVector;
rt.anchorMax = MiddleLeftVector;
rt.pivot = MiddleLeftVector;
return;
case ERectTransAnchor.MiddleCenter:
rt.anchorMin = MiddleCenterVector;
rt.anchorMax = MiddleCenterVector;
rt.pivot = MiddleCenterVector;
return;
case ERectTransAnchor.MiddleRight:
rt.anchorMin = MiddleRightVector;
rt.anchorMax = MiddleRightVector;
rt.pivot = MiddleRightVector;
return;
case ERectTransAnchor.BottomLeft:
rt.anchorMin = BottomLeftVector;
rt.anchorMax = BottomLeftVector;
rt.pivot = BottomLeftVector;
return;
case ERectTransAnchor.BottomCenter:
rt.anchorMin = BottomCenterVector;
rt.anchorMax = BottomCenterVector;
rt.pivot = BottomCenterVector;
return;
case ERectTransAnchor.BottomRight:
rt.anchorMin = BottomRightVector;
rt.anchorMax = BottomRightVector;
rt.pivot = BottomRightVector;
return;
}
Debug.LogWarning("[RectTransUtility.SetRTAnchorAndPivot] 暂不支持的锚点类型！");
}
/// <summary>
/// 设置背景填充/屏幕填充
/// </summary>
/// <param name="self"></param>
/// <param name="left">离左边的距离(距离为正)</param>
/// <param name="bottom">离底部的距离(距离为正)</param>
/// <param name="right">离右边的距离(距离为负)</param>
/// <param name="top">离顶部的距离(距离为负)</param>
/// <returns></returns>
public static RectTransform BgFill(this RectTransform self, float left = 0f, float bottom = 0f, float right = 0f, float top = 0f)
{
self.anchorMin = RectTransUtility.BottomLeftVector;
self.anchorMax = RectTransUtility.TopRightVector;
self.offsetMin = new Vector2(left, bottom);
self.offsetMax = new Vector2(right, top);
return self;
}
/// <summary>
/// 锚点类型
/// </summary>
public enum ERectTransAnchor
{
/// <summary>
/// 左上
/// </summary>
TopLeft = 0,
/// <summary>
/// 上中
/// </summary>
TopCenter = 1,
/// <summary>
/// 右上
/// </summary>
TopRight = 2,
/// <summary>
/// 左中
/// </summary>
MiddleLeft = 3,
/// <summary>
/// 中心
/// </summary>
MiddleCenter = 4,
/// <summary>
/// 右中
/// </summary>
MiddleRight = 5,
/// <summary>
/// 左下
/// </summary>
BottomLeft = 6,
/// <summary>
/// 下中
/// </summary>
BottomCenter = 7,
/// <summary>
/// 右下
/// </summary>
BottomRight = 8
}
}