Add safe area.

Assets/Cryville/Common/Unity/UI/SafeArea.cs

@@ -0,0 +1,38 @@
+using UnityEngine;
+using UnityEngine.EventSystems;
+
+namespace Cryville.Common.Unity.UI {
+	[ExecuteAlways]
+	[RequireComponent(typeof(RectTransform))]
+	public class SafeArea : UIBehaviour {
+		bool _delayedUpdate;
+		protected override void OnValidate() {
+			_delayedUpdate = true;
+		}
+		void Update() {
+			if (_delayedUpdate) {
+				_delayedUpdate = false;
+				UpdateRect();
+			}
+		}
+		protected override void OnRectTransformDimensionsChange() {
+			base.OnRectTransformDimensionsChange();
+			UpdateRect();
+		}
+		protected override void OnTransformParentChanged() {
+			base.OnTransformParentChanged();
+			UpdateRect();
+		}
+		void UpdateRect() {
+			var safeArea = Screen.safeArea;
+			var rectTransform = transform as RectTransform;
+			var canvas = GetComponentInParent<Canvas>(true).transform as RectTransform;
+			RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas, new Vector2(safeArea.xMin, safeArea.yMin), Camera.main, out var pt1);
+			RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas, new Vector2(safeArea.xMax, safeArea.yMax), Camera.main, out var pt2);
+			var result = Rect.MinMaxRect(pt1.x, pt1.y, pt2.x, pt2.y);
+			rectTransform.anchoredPosition = result.center;
+			rectTransform.sizeDelta = result.size;
+			rectTransform.anchorMin = rectTransform.anchorMax = rectTransform.pivot = new Vector2(0.5f, 0.5f);
+		}
+	}
+}

Assets/Cryville/Common/Unity/UI/SafeArea.cs.meta

@@ -0,0 +1,11 @@
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