React native + mobx不重新渲染

Question

Iam目前使用react native和mobx构建一个应用程序。我的问题是，在更改商店的可观察值后，不会重新呈现组件。我的代码如下：

组件/ phoneNumberChange.js：

@inject('store')
@observer export class PhoneNumberChange extends React.Component{
renderPhoneInput = () => (
  <React.Fragment>
    <Button onPress={() => this.props.store.showCountryPicker()}>
      <Text>Show picker</Text>
    </Button>
  </React.Fragment>
);

render = () => (
  <React.Fragment>
    <CountryCodePicker visible= {this.props.store.pickerVisible}/>
  </React.Fragment>
);
}

屏幕/ loginScreen.js：

import { Provider } from "mobx-react";
import { store } from "stores/phoneNumberChangeStore.js";
import { PhoneNumberChange } from "components/phoneNumberChange.js";

export class LoginScreen extends React.Component{

render = () => (
  <Provider store={store}>
    <PhoneNumberChange/>
  </Provider

);

}

商店/ phoneNumberChangeStore.js：

import { observable, action } from "mobx";

class PhoneNumberChangeStore {
  @observable pickerVisible;

  constructor(){
    this.hideCountryPicker();
  }
  @action hideCountryPicker = () => {
    this.pickerVisible = false;
  }
  @action showCountryPicker = () => {
    this.pickerVisible = true;
  }

}
export const store = new PhoneNumberChangeStore();

babel.config.js：

module.exports = function(api) {
  api.cache(true);
  return {
    presets: ['babel-preset-expo'],
    plugins: [
        [
            "@babel/plugin-proposal-decorators",
            {
                "legacy": true
            }
        ]
    ]
  };
};

的package.json：

{
  "name": "myapp",
  "main": "app/app.js",
  "scripts": {
    "start": "expo start",
    "android": "expo start --android",
    "ios": "expo start --ios",
    "eject": "expo eject"
  },
  "dependencies": {
    "@babel/plugin-proposal-decorators": "^7.3.0",
    "babel-plugin-transform-decorators-legacy": "^1.3.5",
    "babel-preset-react-native": "^4.0.1",
    "expo": "^32.0.0",
    "mobx": "^5.9.0",
    "mobx-react": "^5.4.3",
    "prop-types": "^15.7.2",
    "react": "16.5.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-32.0.0.tar.gz",
    "react-native-animatable": "^1.3.1",
    "react-native-ui-kitten": "^3.1.2",
    "react-navigation": "^3.3.2"
  },
  "devDependencies": {
    "babel-preset-expo": "^5.0.0"
  },
  "private": true
}

当可见道具发生变化时，countryCodePicker是否显示。这很有效。但是当我从商店更改一个值时，它不会更新并显示出来。我将不胜感激任何帮助！

干杯

Answer 1

您在default中将商店单件导出为phoneNumberChangeStore.js，但是您要在PhoneNumberChangeStore中导入命名导出loginScreen.js。

请改用default中的loginScreen.js导出。商店物业也被称为pickerVisible，而不是countryCodePickerVisible。

Answer 2

找到了解决方案！我重新定义了实例上的渲染。

我把render = () => {..}换成了render(){ return (...); }

干杯！