本文转自：原文链接

本文转自：原文链接

本文转自：原文链接

问题1：

Could not find iPhone X simulator

> react-native run-ios
info Found Xcode project XXX.xcodeproj
CoreData: annotation:  Failed to load optimized model at path '/Applications/Xcode.app/Contents/Applications/Instruments.app/Contents/Frameworks/InstrumentsPackaging.framework/Versions/A/Resources/XRPackageModel.momd/XRPackageModel 9.0.omo'
error Could not find iPhone X simulator. Run CLI with --verbose flag for more details.

 解决方案：使用命令行运行到当前有的模拟器上，或者直接使用Xcode跑到现有的模拟器上

react-native run-ios --simulator="iPhone 11"

问题2：

Unknown argument type ‘_attribute_’ in method -[RCTAppState getCurrentAppState:error:]. Extend RCTConvert to support this type

打开/node_modules/react-native/React/Base/RCTModuleMethod.mm 文件。

然后修改其中的 RCTParseUnused 方法，为其增加一个新的判断条件 RCTReadString(input, "__attribute__((__unused__))") ||

// 修改后的结果如下
static BOOL RCTParseUnused(const char **input)
{
  return RCTReadString(input, "__unused") ||
         RCTReadString(input, "__attribute__((__unused__))") ||
         RCTReadString(input, "__attribute__((unused))");
}

然后重新启动项目，就可以发现我们能够正常的进入到react-native的项目页面中了。