ReactNative创建直接运行可能出现的坑

Application demo has not been registered.This is either due to a require() error during initialization or failure to call AppRegistry.registerComponert
React Native有很多坑，这是其中一个坑，当你用终端通过React-Native init demo创建完程序后，最好将终端强制退出，再用Xcode打开程序并运行，否则可能会出现上面的错误。