Question

我尝试在我的应用中实现react-native-canvas。在进入包含画布的屏幕上，在使用react-native run-ios生成的版本中，我收到以下错误：

Invariant Violation: requireNativeComponent: "RNCWKWebView" was not found in the UIManager.

This error is located at:
 in RNCWKWebView (at WebView.ios.js:297)
 in RCTView (at View.js:45)
 in View (at WebView.ios.js:300)
 in WebView (at Canvas.js:148)
 in RCTView (at View.js:45)
 in View (at Canvas.js:147)
 in Canvas (at LapDetails.tsx:47)
 in RCTView (at View.js:45)
 in View (at LapDetails.tsx:38)
 in LapDetails (at ComponentWrapper.js:29)
 in WrappedComponent (at renderApplication.js:34)
 in RCTView (at View.js:45)
 in View (at AppContainer.js:98)
 in RCTView (at View.js:45)
 in View (at AppContainer.js:115)
 in AppContainer (at renderApplication.js:33)

getNativeComponentAttributes
 a90c6db6-7158-4812-8a98-ea48c1a859f3:49643:5
<unknown>
 a90c6db6-7158-4812-8a98-ea48c1a859f3:49596:14
Object.exports.get
 a90c6db6-7158-4812-8a98-ea48c1a859f3:43914:20
createInstance
 a90c6db6-7158-4812-8a98-ea48c1a859f3:22099:56
completeWork
 a90c6db6-7158-4812-8a98-ea48c1a859f3:28453:34
completeUnitOfWork
 a90c6db6-7158-4812-8a98-ea48c1a859f3:30472:32
performUnitOfWork
 a90c6db6-7158-4812-8a98-ea48c1a859f3:30635:18
workLoop
 a90c6db6-7158-4812-8a98-ea48c1a859f3:30645:30
renderRoot
 a90c6db6-7158-4812-8a98-ea48c1a859f3:30716:13

再次进入视图时出错：

Invariant Violation: View config not found for name RNCWKWebView.

This error is located at:
 in RNCWKWebView (at WebView.ios.js:297)
 in RCTView (at View.js:45)
 in View (at WebView.ios.js:300)
 in WebView (at Canvas.js:148)
 in RCTView (at View.js:45)
 in View (at Canvas.js:147)
 in Canvas (at LapDetails.tsx:47)
 in RCTView (at View.js:45)
 in View (at LapDetails.tsx:38)
 in LapDetails (at ComponentWrapper.js:29)
 in WrappedComponent (at renderApplication.js:34)
 in RCTView (at View.js:45)
 in View (at AppContainer.js:98)
 in RCTView (at View.js:45)
 in View (at AppContainer.js:115)
 in AppContainer (at renderApplication.js:33)

 Object.exports.get
  ReactNativeViewConfigRegistry.js:94:6
 createInstance
  ReactNativeRenderer-dev.js:3946:49
 completeWork
  ReactNativeRenderer-dev.js:13385:25
 completeUnitOfWork
  ReactNativeRenderer-dev.js:15892:25
 performUnitOfWork
  ReactNativeRenderer-dev.js:16103:11
 workLoop
  ReactNativeRenderer-dev.js:16115:23
 renderRoot
  ReactNativeRenderer-dev.js:16219:6
 performWorkOnRoot
  ReactNativeRenderer-dev.js:17198:6
 performWork
  ReactNativeRenderer-dev.js:17099:6

现在有趣的部分。当我从XCode运行完全构建的应用程序时，我可以进入视图并显示画布。我尝试了自动重新链接，重新安装，不同的设备和手动重新链接，因为那些提到最多的修复了此类问题。但是，用react-native run-ios生成的版本的结果没有任何改变。

我很确定问题出在我的react-native-webview链接上，但是我不知道在哪里，我基本上做了安装指南中提到的所有事情……

我的android项目当前已损坏，因此我无法提供有关android行为的其他信息。

如果您想知道这是视图：

import React, { Component } from 'react';
import Canvas from 'react-native-canvas';

class App extends Component {

 handleCanvas = (canvas) => {
  const ctx = canvas.getContext('2d');
  ctx.fillStyle = 'purple';
  ctx.fillRect(0, 0, 100, 100);
 }

 render() {
  return (
   <Canvas ref={this.handleCanvas}/>
  );
 }
}

Answer 1

通常，此类问题是由不正确的链接本机依赖性引起的。您可以尝试react-native link <package name>，但是在这种情况下似乎并非如此，因为完全构建的应用程序可以正常工作。

一些旧的构建文件会干扰开发的构建，我通过删除整个项目并再次使用git克隆来解决了这个问题。要在没有git的情况下执行此操作，您需要删除android /和ios /中的所有构建文件，并删除您的node_modules（这不是必须要做的，但是出于安全考虑）。

如果在此之后仍然遇到问题，您可能会认为第一个问题代表了您的情况，尤其是在您甚至无法编译生产版本的情况下。

带有反应本机run-ios专有的不变式违规

1 个答案: