React Native-警告汇总

• 在使用SectionList的时候：
  ⚠️VirtualizedList: missing keys for items, make sure to specify a key property on each item or provide a custom keyExtractor.
  解决方案：
  _extraUniqueKey(item ,index){ return "index"+index+item; }

• 在使用FlatList的时候：
  ⚠️VirtualizedList: missing keys for items, make sure to specify a key property on each item or provide a custom keyExtractor.
  解决方案：
  _extraUniqueKey(item ,index){ return "index"+index+item; } < FlatList keyExtractor = {this._extraUniqueKey} />

• undefined is not an object(evaluating '_react3.default.PropTypes.shape'
  

  1.png
  
  解决方案：终端执行npm install --save https://github.com/facebookarchive/react-native-custom-components.git

• [Invariant Violation: Element type is invalid: expected a string (for built-in components) or a class/function but got: object](https://stackoverflow.com/questions/34130539/uncaught-error-invariant-violation-element-type-is-invalid-expected-a-string)
  

  Snip20171122_13.png
  
  解决方案：.js文件中使用import {Navigator} from 'react-native-deprecated-custom-components';

• Navigator is deprecated and has been removed from this package. It can now be installed and import from ‘react-native-deprecated-custom-components’ instead of ‘react-native’
  

  20170618160119886.png
  
  解决方案：

  1. 通过npm安装相应的库，终端输入命令:npm i react-native-deprecated-custom-components --save
  2. 在使用的JS文件中将Navigator引入进来:import {Navigator} from 'react-native-deprecated-custom-components';
  

后续会更新不同的警告以及对应的解决方案