Before i update my MacOs and xCode when i write
npm run ios it is starting simulator . But now i got error like this; Simulator not installed. Please visit https://developer.apple.com/xcode/download/ to download Xcode and the iOS simulator. If you already have the latest version of Xcode installed, you may have to run the command
sudo xcode-select -s /Applications/Xcode.app.
I have simulator latest version. And only i can start simulator from xCode and after i can write npm run ios to build my project.
My Versions :
MacOs : 10.14.4
xCode : 10.2 (10E125)
Note: I published my app in store. Before published, i work in version 9 for xCode and not Mojave for MacOs and it is working clearly.