小编Asm*_*sma的帖子

我将我的 React Native 应用程序从 0.48.3 升级到 0.59.8 一切正常，直到启动模拟器。然后出现这个错误：

   error: bundling failed: Error: Unable to resolve module 
   `@babel/runtime/helpers/interopRequireDefault` from 
    `E:\als\variant\generic\index.android.js`: Module 
    `@babel/runtime/helpers/interopRequireDefault` does not exist in the 
    Haste module map

这是我的 Package.json ：

  "dependencies": {
  "@babel/polyfill": "^7.4.4",
  "@babel/runtime": "^7.0.0-beta.55",
   "babel-loader": "^8.0.5",
   "content-disposition": "^0.5.2",
   "core-js": "^3.0.1",
   "react": "16.8.6",
   "react-dom": "16.8.6",
   "react-loader": "^2.4.5",
   "react-native": "0.59.8",
   "react-redux": "^5.0.6",
    "react-router-dom": "^5.0.0",
    "redux": "^3.7.2",
   "redux-thunk": "^2.2.0",

},
 "devDependencies": {
   "@babel/plugin-proposal-class-properties": "^7.4.4",
  "@babel/plugin-proposal-decorators": "^7.4.4",
  "@babel/plugin-proposal-nullish-coalescing-operator": "^7.4.4",
  "@babel/plugin-transform-block-scoping": "^7.0.0",
  "@babel/plugin-transform-flow-strip-types": "^7.4.4",
   "@babel/plugin-transform-react-jsx-source": "^7.2.0",
   "@babel/plugin-transform-runtime": "^7.4.4",
   "@babel/preset-env": "^7.4.3",
    "@babel/preset-flow": …

我有两个组成部分：

• 第一个是父组件，它是通常的React组件。
• 第二个是孩子，它是功能组件。

我想将Titles的值（处于子状态）传递给父Component。这是我的子组件代码：

        export default function ChildApp(props) {

        const  [titles,setTitles] = React.useState("")

          return (

           <Button title="submit" onPress={()=>setTitles("asma")}/>

               );
             }

这是我的父组件：

       this.state = { titles:"foo"} 
       setTitles = titles => this.setState({ titles })

       // i need the value of Titles to be set in state 
        export default class ParentApp extends Component {
       const titles = this.state.titles
           <ChildApp titles={titles} setTitles={this.setTitles} />
         }

看起来很容易做到，但这是我第一次使用功能组件。你能帮我吗 ？