这对我来说很管用:

react-native start --reset-cache

博览会用户-确保您的app.json sdk版本和包。Json的博览会版本是(可能相等)彼此兼容。

I've never seen this error before, but whenever I can't get Xcode and React-Native to play well together, I do a couple of things. Check what version of Xcode I'm working with. If it needs to be updated, I update it. Then clearing watchman and the cache are the second place I go. I don't use the reset cache command. It always says that I need to verify the cache, so I skip that (you can do it though, I just get confused). I use rm -rf $TMPDIR/react-* to get rid of any cached builds. If that doesn't work, I try to build the app in Xcode, then work my way from there, to build it with react-native run-ios. With this error message, it seems you might start by trying to build it with Xcode. Hope that helps...let me know your progress with it. Good luck! (Also, you could update to RN 0.51 as another attempt to get your versions synced.)

对于我的问题修复此更改模拟器与API级别低于28。这个问题的根源是API级别28及以上的网络变化。通过添加来解决这个问题

<application
     android:usesCleartextTraffic="true"

对androidManifest.xml

这尤其适用于Android Studio 3.2或更新的用户，因为这在升级之前似乎没有发生。

如果你没有在你的配置(包)中更改React Native的版本。)，版本不匹配的问题可能来自于检出git中的另一个提交后对项目文件的未检测到的更改。要克服这个问题，请确保:

清洁构建:构建>清洁项目 用Gradle文件同步项目:在导航栏上的“停止”按钮旁边 制作项目:导航栏中第一个带有锤子图标的按钮 最后运行/调试应用程序

这也将克服会话“应用程序”:错误安装APK错误，可能发生由于即时运行，一旦应用程序从设备上卸载。

只要去你的android/app/build。Gradle，然后添加到依赖项部分:

dependencies{
compile ("com.facebook.react:react-native:0.50.3") { force = true } 
}

/// react的原生版本可以在package.json中找到