1、獲得ui介面的UIPanel的最大層級:

 1  static int GetUIMaxDepth(Transform root)
 2         {
 3             UIPanel[] panels = root.GetComponentsInChildren<UIPanel>(false);
 4             if (panels == null || panels.Length < 1)
 5                 return 0;
 6 
 7             Array.Sort(panels, (a, b) => a.depth - b.depth);
 
 8             UIPanel lastPanel = panels.LastOrDefault();
 9             return lastPanel != null ? lastPanel.depth : 0;
10         }

2、設定ui介面中UIPanel的層級:

 1 static void SetUIDepth(Transform root, int depth)
 2         {
 3             UIPanel[] panels = root.GetComponentsInChildren<UIPanel>(true
 
);
 4             if (panels == null || panels.Length < 1)
 5                 return;
 6 
 7             Array.Sort(panels, (a, b) => a.depth - b.depth);
 8             for (int i = 0; i < panels.Length; i++)
 9             {
10                 UIPanel p = panels[i];
11                 if (p != null
 
)
12                     p.depth = i + depth;
13             }
14         }

3、遊戲中開啟的UI一般是儲存在一個集合中的。當需要給新的UI設定層級的時候，只需要通過一個迴圈遍歷，找出已開啟的UI中的最大層級，然後在此基礎上加1，即 max + 1,然後將 max +１賦值給新開啟的UI即可