Unity ugui Anchor锚点自动适配画布中的相对位置

 1 using UnityEngine;
 2 using UnityEditor;
 3 
 4 public class AnchorsAdapt
 5 {
 6     [MenuItem("Tools/AnchorsAdaptSize")]
 7     private static void SelectionMS()
 8     {
 9         GameObject[] gos = Selection.gameObjects;
10         for (int i = 0; i < gos.Length; i++)
11         {
12             if (gos[i].GetComponent<RectTransform>() == null)
13                 continue;
14             AdaptSize(gos[i]);
15         }
16     }
17 
18     [MenuItem("Tools/AnchorsAdaptPivot")]
19     private static void SelectionMP()
20     {
21         GameObject[] gos = Selection.gameObjects;
22         for (int i = 0; i < gos.Length; i++)
23         {
24             if (gos[i].GetComponent<RectTransform>() == null)
25                 continue;
26             AdaptPivot(gos[i]);
27         }
28     }
29 
30     private static void AdaptPivot(GameObject go)
31     {
32         //------获取rectTransform----
33         RectTransform partentRect = go.transform.parent.GetComponent<RectTransform>();
34         RectTransform localRect = go.GetComponent<RectTransform>();
35 
36         //位置信息
37         Vector3 partentPos = go.transform.parent.position;
38         Vector3 localPos = go.transform.position;
39 
40         float partentWidth = partentRect.rect.width;
41         float partentHeight = partentRect.rect.height;
42 
43         //---------位移差------
44         float offX = localPos.x - partentPos.x;
45         float offY = localPos.y - partentPos.y;
46 
47         float rateW = offX / partentWidth;
48         float rateH = offY / partentHeight;
49         var anchor = new Vector2(.5f + rateW, .5f + rateH);
50         localRect.SetRtAnchorSafe(anchor, anchor);
51     }
52 
53     private static void AdaptSize(GameObject go)
54     {
55         //位置信息
56         Vector3 partentPos = go.transform.parent.position;
57         Vector3 localPos = go.transform.position;
58         //------获取rectTransform----
59         RectTransform partentRect = go.transform.parent.GetComponent<RectTransform>();
60         RectTransform localRect = go.GetComponent<RectTransform>();
61 
62         float partentWidth = partentRect.rect.width;
63         float partentHeight = partentRect.rect.height;
64         float localWidth = localRect.rect.width * 0.5f;
65         float localHeight = localRect.rect.height * 0.5f;
66         //---------位移差------
67         float offX = localPos.x - partentPos.x;
68         float offY = localPos.y - partentPos.y;
69 
70         float rateW = offX / partentWidth;
71         float rateH = offY / partentHeight;
72         localRect.anchorMax = localRect.anchorMin = new Vector2(0.5f + rateW, 0.5f + rateH);
73         localRect.anchoredPosition = Vector2.zero;
74 
75         //大小偏移
76         partentHeight = partentHeight * 0.5f;
77         partentWidth = partentWidth * 0.5f;
78         float rateX = (localWidth / partentWidth) * 0.5f;
79         float rateY = (localHeight / partentHeight) * 0.5f;
80 
81         //锚点偏移值
82         var pivotOffX = localRect.pivot.x-.5f;
83         var pivotOffY = localRect.pivot.y-.5f;
84         var pivotOff = new Vector2(localWidth * pivotOffX / partentWidth, localHeight * pivotOffY / partentHeight);
85 
86         localRect.anchorMax = new Vector2(localRect.anchorMax.x + rateX, localRect.anchorMax.y + rateY) - pivotOff;
87         localRect.anchorMin = new Vector2(localRect.anchorMin.x - rateX, localRect.anchorMin.y - rateY) - pivotOff;
88         localRect.offsetMax = localRect.offsetMin = Vector2.zero;
89     }
90 }

 1     public static void SetRtAnchorSafe(this RectTransform rt, Vector2 anchorMin, Vector2 anchorMax)
 2     {
 3         if (anchorMin.x < 0 || anchorMin.x > 1 || anchorMin.y < 0 || anchorMin.y > 1 || anchorMax.x < 0 || anchorMax.x > 1 || anchorMax.y < 0 || anchorMax.y > 1)
 4             return;
 5 
 6         var lp = rt.localPosition;
 7         //注意不要直接用sizeDelta因为该值会随着anchor改变而改变
 8         var ls = new Vector2(rt.rect.width, rt.rect.height);
 9 
10         rt.anchorMin = anchorMin;
11         rt.anchorMax = anchorMax;
12 
13         //动态改变anchor后size和localPostion可能会发生变化需要重新设置
14         rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, ls.x);
15         rt.SetSizeWithCurrentAnchors(RectTransform.Axis.Vertical, ls.y);
16         rt.localPosition = lp;
17     }