problem
Android Studio can start the next iOS simulator mac environment, but do not see in the list of devices inside and can not install the application. (Already installed xcode)
solve
Open a terminal, enter the following command and press Enter:
sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer
Results are as follows
Reproduced in: https: //www.jianshu.com/p/3feb8e3d0e15