我尝试在我的应用程序中实现react-native-canvas。在进入包含画布的屏幕时,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
第二次进入View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运行应用程序完全构建时,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,因为那些最常提到的修复此类问题。但是没有什么能改变react-native run-ios
生成的版本的结果。
我很确定问题是我的react-native-webview的链接,但我无法弄清楚在哪里,我基本上做了安装指南提到的一切...
我的android项目目前已被破坏,因此我无法提供有关Android行为的其他信息。
万一你想知道这是视图:
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}/>
);
}
}
通常这样的问题是由错误的链接本机依赖性引起的。你可以尝试react-native link <package name>
,但在这里似乎并非如此,因为完全构建的应用程序工作。
一些旧的构建文件干扰开发构建,我通过删除整个项目并再次使用git克隆它来解决这个问题。要做到这一点没有git你需要删除android /和ios /中的所有构建文件并删除你的node_modules(为了安全起见,这不是必须这样做)。
如果在此之后仍然遇到问题,您可能会认为第一个问题是代表您的情况,特别是如果您甚至无法编译生产版本。