Invariant Violation: requireNativeComponent:"***" was not found in theUIManager

[liyuewen]

在MyWebViewManager.java中
`
public class MyWebViewManager extends SimpleViewManager {

public static final String REACT_CLASS = "MyWebViewManager";

@OverRide
public String getName() {
return REACT_CLASS;
}

@OverRide
protected TextView createViewInstance(ThemedReactContext reactContext) {
TextView tv = new TextView(reactContext);
tv.setText("hello from android !");
return tv;
}
}
`

在MyWebViewPackage.java中
`
public class MyWebViewPackage implements ReactPackage {

@OverRide
public List createViewManagers(ReactApplicationContext reactContext) {
return Collections.emptyList();
}

@OverRide
public List createNativeModules(
ReactApplicationContext reactContext) {
List modules = new ArrayList<>();

  modules.add(new MyWebViewManager());

  return modules;

}

}
`

在ScannerView.js中
`
import React, { Component } from 'react'
import { View, requireNativeComponent } from 'react-native'

const MyWebViewManager = requireNativeComponent('MyWebViewManager', ScannerView);

class ScannerView extends Component {
render() {
return
}
}

ScannerView.propTypes = {
...View.propTypes
}

export default ScannerView
`
在模拟器中发生错误
Invariant Violation: requireNativeComponent:"MyWebViewManager" was not found in theUIManager.

[github-actions]

⚠️	Missing Environment Information
ℹ️	Your issue may be missing information about your development environment. You can obtain the missing information by running react-native info in a console.

[liyuewen]

我的环境信息
System:
OS: Windows 10 10.0.17763
CPU: (8) x64 Intel(R) Core(TM) i7-4710MQ CPU @ 2.50GHz
Memory: 2.90 GB / 7.89 GB
Binaries:
Node: 10.16.3 - C:\Program Files\nodejs\node.EXE
Yarn: 1.17.3 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.9.0 - C:\Program Files\nodejs\npm.CMD
Watchman: Not Found
SDKs:
Android SDK:
API Levels: 23, 25, 27, 28, 29
Build Tools: 23.0.1, 27.0.3, 28.0.3, 29.0.2
System Images: android-23 | Intel x86 Atom, android-23 | Google APIs Intel x86 Atom, android-23 | Google APIs Intel x86 Atom_64, android-29 | Google APIs Intel x86 Atom
Android NDK: Not Found
IDEs:
Android Studio: Version 3.5.0.0 AI-191.8026.42.35.5791312
Languages:
Java: 1.8.0_221
Python: 2.7.12
npmPackages:
@react-native-community/cli: Not Found
react: 16.11.0 => 16.11.0
react-native: 0.62.2 => 0.62.2
npmGlobalPackages:
react-native: Not Found

[TheHothihi]

在MyWebViewPackage.java中, 需要將MyWebViewManager 添加到createViewManagers method之中,
如果只添加到createNativeModules method之中,只能在NativeModules中使用

`
public class MyWebViewPackage implements ReactPackage {

@OverRide
public List createViewManagers(ReactApplicationContext reactContext) {
/* 添加到createViewManagers method之後才能在requireNativeComponent中引用*/
List modules = new ArrayList<>();
modules.add(new MyWebViewManager());
return modules;
//return Collections.emptyList();
}

@OverRide
public List createNativeModules(
ReactApplicationContext reactContext) {
/* 添加到createNativeModules method之後才能在NativeModules中引用, eg.NativeModules. MyWebViewManager */
List modules = new ArrayList<>();
modules.add(new MyWebViewManager());
return modules;
}

}
`

[liyuewen]

在MyWebViewPackage.java中，需要将MyWebViewManager添加到createViewManagers方法之中，
如果只添加到createNativeModules方法之中，只能在NativeModules中使用

`
公共类MyWebViewPackage实现了ReactPackage {

@OverRide
public List createViewManagers（ReactApplicationContext reactContext）{
/ 添加到createViewManagers方法之后才能在requireNativeComponent中引用 /
列表模块= new ArrayList <>（）;
modules.add（new MyWebViewManager（））;
返回模块；
//返回Collections.emptyList（）;
}

@OverRide
public List createNativeModules（
ReactApplicationContext reactContext）{
/ *添加到createViewManagers方法之后才能在NativeModules中引用，例如。NativeModules。MyWebViewManager * /
列表模块= new ArrayList <>（）;
modules.add（new MyWebViewManager（））;
返回模块；
}

}
`

我已经找到问题了，是我js注册的时候发生了问题，但是还是感谢哦。