diff --git a/.agents/skills/mpx2rn/references/rn-script-reference.md b/.agents/skills/mpx2rn/references/rn-script-reference.md
index ee8dba4173..2c10faa553 100644
--- a/.agents/skills/mpx2rn/references/rn-script-reference.md
+++ b/.agents/skills/mpx2rn/references/rn-script-reference.md
@@ -587,11 +587,13 @@ setAppHide()
 | `getCurrentPages()` | 返回当前导航栈中已映射的页面实例列表（顺序与路由 state 相关）。 |
 | `setAppShow()` | 手动触发应用「进入前台」逻辑，驱动已注册的 `onShow`。 |
 | `setAppHide()` | 手动触发应用「进入后台」逻辑，驱动已注册的 `onHide`。 |
+| `notifyDimensionsChange(dimensions?)` | 主动通知框架 dimensions 发生变化，触发 rpx、vw、vh、媒体查询、onResize 等的重新计算。不传参时默认使用当前屏幕 dimensions 并重新执行 `customDimensions`。 |
 
 #### 注意事项
 
 - 勿在 App 构造函数执行完成前依赖 `getApp()` 内业务字段已赋值完毕；与路由相关的初始化宜放在 `onLaunch` / `onShow`。
 - `getCurrentPages()` 依赖 React Navigation 焦点与 `__mpxPagesMap`，与原生小程序栈细节不完全相同。
+- `notifyDimensionsChange` 由框架在首次样式计算时自动注入，需在开始渲染后才可调用。
 
 ---
 
diff --git a/docs-vitepress/guide/rn/application-api.md b/docs-vitepress/guide/rn/application-api.md
index ba225bbfa8..fd7185eb1d 100644
--- a/docs-vitepress/guide/rn/application-api.md
+++ b/docs-vitepress/guide/rn/application-api.md
@@ -463,7 +463,6 @@ createComponent({
 
 例如: 在折叠屏中我们期望只在其中一半屏上展示，可在 customDimensions 中判断当前是否为折叠屏展开状态，如果是则将 ScreenWidth 设置为原来的一半。
 
-
 ### 前后台切换 {#app-state-change}
 
 #### mpx.config.rnConfig.disableAppStateListener
diff --git a/packages/core/@types/global.d.ts b/packages/core/@types/global.d.ts
index 51dbff4263..7a3297f9db 100644
--- a/packages/core/@types/global.d.ts
+++ b/packages/core/@types/global.d.ts
@@ -14,3 +14,5 @@ declare module '*?resolve' {
 
 declare let setAppShow: () => void
 declare let setAppHide: () => void
+
+declare let notifyDimensionsChange: (dimensions?: { window: import('react-native').ScaledSize; screen: import('react-native').ScaledSize }) => void
diff --git a/packages/core/@types/index.d.ts b/packages/core/@types/index.d.ts
index 41c6840928..237a7d1b22 100644
--- a/packages/core/@types/index.d.ts
+++ b/packages/core/@types/index.d.ts
@@ -376,9 +376,9 @@ export interface RnConfig {
    * @param dimensions 包含 window 和 screen 的尺寸信息
    * @returns 返回修改后的尺寸对象，或 void 表示不修改
    */
-  customDimensions?: <T extends { window: ScaledSize; screen: ScaledSize }>(
-    dimensions: T
-  ) => T | void
+  customDimensions?: (
+    dimensions: { window: ScaledSize; screen: ScaledSize }
+  ) => { window: ScaledSize; screen: ScaledSize } | void
 
   /**
    * 加载并执行异步分包的方法。
diff --git a/packages/core/src/platform/builtInMixins/styleHelperMixin.ios.js b/packages/core/src/platform/builtInMixins/styleHelperMixin.ios.js
index 0628aaf89f..bf7e1f221e 100644
--- a/packages/core/src/platform/builtInMixins/styleHelperMixin.ios.js
+++ b/packages/core/src/platform/builtInMixins/styleHelperMixin.ios.js
@@ -4,8 +4,8 @@ import { reactive } from '../../observer/reactive'
 import Mpx from '../../index'
 
 global.__mpxAppDimensionsInfo = {
-  window: Dimensions.get('window'),
-  screen: Dimensions.get('screen')
+  window: Object.assign({}, Dimensions.get('window')),
+  screen: Object.assign({}, Dimensions.get('screen'))
 }
 global.__mpxSizeCount = 0
 global.__mpxPageSizeCountMap = reactive({})
@@ -18,30 +18,40 @@ global.__GCC = function (className, classMap, classMapValueCache) {
   return classMapValueCache.get(className)
 }
 
-let dimensionsInfoInitialized = false
-function useDimensionsInfo (dimensions) {
-  dimensionsInfoInitialized = true
+function getPageSize (screen = global.__mpxAppDimensionsInfo.screen) {
+  return screen.width + 'x' + screen.height
+}
+
+// 将 dimensions 写入全局（支持 customDimensions 自定义），返回最终生效的 dimensions
+function applyDimensionsInfo (dimensions) {
   if (typeof Mpx.config.rnConfig?.customDimensions === 'function') {
     dimensions = Mpx.config.rnConfig.customDimensions(dimensions) || dimensions
   }
   global.__mpxAppDimensionsInfo.window = dimensions.window
   global.__mpxAppDimensionsInfo.screen = dimensions.screen
+  return dimensions
 }
 
-function getPageSize (window = global.__mpxAppDimensionsInfo.screen) {
-  return window.width + 'x' + window.height
-}
-
-Dimensions.addEventListener('change', ({ window, screen }) => {
-  const oldScreen = getPageSize(global.__mpxAppDimensionsInfo.screen)
-  useDimensionsInfo({ window, screen })
+function onDimensionsChange (dimensions) {
+  const oldScreen = getPageSize()
+  /**
+   * 鸿蒙上在屏幕尺寸不变时，调用 Dimensions.get 获取到的返回值都是同一个对象，
+   * 为防止外部修改dimensions导致影响其他位置调用Dimensions.get的返回，所以clone一份进行后续处理
+   */
+  if (!dimensions) {
+    dimensions = {
+      window: Dimensions.get('window'),
+      screen: Dimensions.get('screen')
+    }
+  }
+  applyDimensionsInfo({ window: Object.assign({}, dimensions.window), screen: Object.assign({}, dimensions.screen) })
 
-  // 对比 screen 高宽是否存在变化
-  if (getPageSize(screen) === oldScreen) return
+  // screen 高宽未变化时不触发 resize 副作用
+  if (getPageSize() === oldScreen) return
 
   global.__classCaches?.forEach(cache => cache?.clear())
 
-  // 更新全局和栈顶页面的标记，其他后台页面的标记在show之后更新
+  // 更新全局和栈顶页面的标记，其他后台页面的标记在 show 之后更新
   global.__mpxSizeCount++
 
   const navigation = getFocusedNavigation()
@@ -52,7 +62,11 @@ Dimensions.addEventListener('change', ({ window, screen }) => {
       global.__mpxPageStatusMap[navigation.pageId] = `resize${global.__mpxSizeCount}`
     }
   }
-})
+}
+// 默认实现：不传参时通过 Dimensions 实时获取当前屏幕尺寸（拷贝一份防止原对象被外部修改）
+global.notifyDimensionsChange = onDimensionsChange
+
+Dimensions.addEventListener('change', onDimensionsChange)
 
 // TODO: 1 目前测试鸿蒙下折叠屏screen固定为展开状态下屏幕尺寸，仅window会变化，且window包含状态栏高度
 // TODO: 2 存在部分安卓折叠屏机型在折叠/展开切换时，Dimensions监听到的width/height尺寸错误，并触发多次问题
@@ -79,8 +93,13 @@ const unit = {
 
 const empty = {}
 
+let dimensionsApplied = false
 function formatValue (value, unitType) {
-  if (!dimensionsInfoInitialized) useDimensionsInfo(global.__mpxAppDimensionsInfo)
+  // 懒初始化：首次调用时将初始 dimensions 写入全局（触发 customDimensions 处理）
+  if (!dimensionsApplied) {
+    dimensionsApplied = true
+    applyDimensionsInfo(global.__mpxAppDimensionsInfo)
+  }
   if (unitType === 'hairlineWidth') {
     return StyleSheet.hairlineWidth
   }