Unity3D UGUI Image与父级保持比例缩放

 1 using UnityEngine;
 2 using System.Collections;
 3 using UnityEngine.UI;
 4 
 5 public class X_RectAutoSize : MonoBehaviour
 6 {
 7     //原始尺寸
 8     private Vector2 olSize;
 9     //缩放后的尺寸
10     private Vector2 size;
11     //原始尺寸宽高比
12     private float al;
13     private RectTransform self;
14     public bool lockHeight;
15     public bool lockPos= true;
16     internal float parentHeight;
17     public float heightBoder;
18 
19     void Update()
20     {
21         self = GetComponent<RectTransform>();
22         if (!lockHeight)
23         {
24             parentHeight = self.parent.GetComponent<RectTransform>().rect.size.y - heightBoder; 
25         }
26         self.GetComponent<Image>().SetNativeSize();
27         olSize = self.sizeDelta;
28         al = olSize.x / olSize.y;
29         size = new Vector2(parentHeight * al, parentHeight);
30         self.sizeDelta = size;
31         if (lockPos)
32         {
33             self.anchoredPosition = Vector2.zero;
34         }
35     }
36 }