在 react-native-maps 上需要未知模块 "undefined"

Question

我想从 here 实现 react-native-maps。但是，当我在 App.js 上使用代码 import MapView from 'react-native-maps'; 导入 MapView 时，出现此错误：

Requiring unknown module "undefined".If you are sure the module is there, try restarting Metro Bundler. You may also want to run yarn, or npm install (depending on your environement).

我的package.json是

{
  "name": "MyNewProject",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest"
  },
  "dependencies": {
    "npm": "^5.8.0",
    "react": "16.3.0-rc.0",
    "react-native": "0.54.4",
    "react-native-image-picker": "^0.26.7",
    "react-native-maps": "^0.20.1"
  },
  "devDependencies": {
    "babel-jest": "22.4.3",
    "babel-preset-react-native": "4.0.0",
    "jest": "22.4.3",
    "react-test-renderer": "16.3.0-rc.0"
  },
  "jest": {
    "preset": "react-native"
  }
}

Answer 1

尝试将此从您的 package.json "react-native-maps": "^0.20.1" 更改为此 "react-native-maps"：“https://github.com/react-community/react-native-maps.git"` to ensure that you will use the master branch as suggested here https://github.com/react-community/react-native-maps/issues/2051#issuecomment-371530715

在 react-native-maps 上需要未知模块 "undefined"

Requiring unknown module "undefined" on react-native-maps

ios

reactjs

react-native

react-native-maps