React Native 错误消息:尝试添加已设置显式 ID 的根视图 [英] React Native error message: Trying to add a root view with an explicit id already set

问题描述

我目前正在使用 React Native 开发应用程序.基础是点燃.目前，当我启动应用程序时，经常会收到一条我不明白的错误消息.也许有人可以告诉我它说了什么或如何解决问题.

I am currently developing an application with React Native. The basis was Ignite. At the moment, very often when I start the application, I get an error message that I do not understand. Maybe someone can tell me about what it says or how to fix the problem.

Trying to add a root view with an explicit id already set. React Native uses the id field to track react tags and will overwrite this field. If that is fine, explicitly overwrite the id field to View.NO_ID before calling addRootView.
addRootViewGroup
    NativeViewHierarchyManager.java:504
addRootView
    NativeViewHierarchyManager.java:496
addRootView
    UIViewOperationQueue.java:572
registerRootView
    UIImplementation.java:129
addRootView
    UIManagerModule.java:211
attachRootViewToInstance
    ReactInstanceManager.java:897
setupReactContext
    ReactInstanceManager.java:855
access$1000
    ReactInstanceManager.java:109
run
    ReactInstanceManager.java:821
handleCallback
    Handler.java:739
dispatchMessage
    Handler.java:95
dispatchMessage
    MessageQueueThreadHandler.java:31
loop
    Looper.java:148
run
    MessageQueueThreadImpl.java:194
run
    Thread.java:818

我不确定需要哪些信息来帮助我，但这些至少是我项目的依赖项(来自 package.json):

I'm not sure which information is necessary to help me, but these are at least the dependencies of my project (from package.json):

"dependencies": {
  "apisauce": "^0.14.0",
  "babel-preset-expo": "^4.0.0",
  "format-json": "^1.0.3",
  "lodash": "^4.17.2",
  "native-base": "^2.3.2",
  "prop-types": "^15.5.10",
  "querystringify": "0.0.4",
  "ramda": "^0.24.1",
  "react": "16.0.0-alpha.12",
  "react-native": "0.48.4",
  "react-native-animatable": "^1.2.4",
  "react-native-config": "^0.6.0",
  "react-native-elements": "^0.17.0",
  "react-native-i18n": "^2.0.6",
  "react-native-responsive-ui": "^1.1.1",
  "react-native-simple-encryption": "^1.2.1",
  "react-native-swiper": "^1.5.13",
  "react-native-vector-icons": "^4.4.0",
  "react-navigation": "^1.0.0-beta.13",
  "react-redux": "^5.0.2",
  "redux": "^3.6.0",
  "redux-persist": "^4.1.0",
  "redux-saga": "^0.15.6",
  "reduxsauce": "0.4.1",
  "seamless-immutable": "^7.0.1"
},
"devDependencies": {
  "@storybook/addon-storyshots": "^3.2.12",
  "@storybook/react-native": "^3.2.12",
  "babel-jest": "21.2.0",
  "babel-plugin-ignite-ignore-reactotron": "^0.3.0",
  "babel-preset-es2015": "^6.18.0",
  "babel-preset-react-native": "3.0.2",
  "enzyme": "^2.6.0",
  "husky": "^0.13.1",
  "ignite-ir-boilerplate": "^2.1.1",
  "jest": "21.2.1",
  "mockery": "^2.0.0",
  "react-addons-test-utils": "~15.4.1",
  "react-dom": "16.0.0-alpha.12",
  "react-test-renderer": "16.0.0-alpha.12",
  "reactotron-react-native": "^1.12.0",
  "reactotron-redux": "^1.11.1",
  "reactotron-redux-saga": "^1.11.1"
},

推荐答案

我注意到在导出组件后声明变量或属性时会发生这种情况.例如，如果您执行以下操作:

I noticed that this happens when you declare variables or properties after exporting your component. For example if you do the following:

export default SignInLayout extends React.Component {
    render() {
        <Header />
        <Content />
        <Footer />
    }
}

const styles = Stylesheet.create({
    red: {
      color: red
    }
});

您收到错误尝试添加已设置显式 ID 的根视图.

要解决此问题，请在导出组件之前向上移动变量声明.或者您仍然可以通过将上面的代码更改为仅在最后导出组件来将变量声明保留在底部.

To fix this, either move your variable declarations up, before exporting your component. Or You can still keep your variable declarations at the bottom by changing the above code to only export the component at the end.

SignInLayout extends React.Component {
    render() {
        <Header />
        <Content />
        <Footer />
    }
}

const styles = Stylesheet.create({
    red: {
      color: red
    }
});

export default SignInLayout;

这篇关于React Native 错误消息:尝试添加已设置显式 ID 的根视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！