npm install app-inspector -g
which app-inspector # /Users/zeeshan/.nvm/versions/node/v9.3.0/bin/app-inspector
cd /Users/zeeshan/.nvm/versions/node/v9.3.0/bin/app-inspector
npm remove uiautomatorwd
npm install uiautomatorwd@1.0.45
$ /Applications/Xcode.app/Contents/Developer/Applications/Simulator.app
Open your simulator, choose Hardware - devices - manage devices. You will find the identifier in device information.
$ app-inspector -u 17B7A634-8A38-4727-A040-0280348E16F7
https://nishantverma.gitbooks.io/appium-for-android/exploring_uiautomatorviewer/
$ uiautomatorviewer
adb devices
List of devices attached
192.168.57.101:5555 device
app-inspector -u "192.168.57.101:5555"