init

Assets/Scripts/Camera/ScreenAspect.cs

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+using UnityEngine;
+
+namespace Camera
+{
+    public class ScreenAspect : MonoBehaviour
+    {
+        //目标比例，默认16:9
+        public float TargetAspect = 16f / 9f;
+        private UnityEngine.Camera _mainCamera;
+
+        private void Awake()
+        {
+            _mainCamera = UnityEngine.Camera.main;
+            var windowAspect = Screen.width / (float)Screen.height;
+
+            var scaleHeight = windowAspect / TargetAspect;
+
+            if (scaleHeight < 1f)
+            {
+                var rect = _mainCamera.rect;
+
+                rect.width = 1f;
+                rect.height = scaleHeight;
+                rect.x = 0;
+                rect.y = (1f - scaleHeight) / 2f;
+
+                _mainCamera.rect = rect;
+            }
+            else
+            {
+                var scaleWidth = 1f / scaleHeight;
+
+                var rect = _mainCamera.rect;
+
+                rect.width = scaleWidth;
+                rect.height = 1f;
+                rect.x = (1f - scaleWidth) / 2f;
+                rect.y = 0;
+
+                _mainCamera.rect = rect;
+            }
+        }
+    }
+}