when upload my app with xcode 10.1 i'm getting the Warning
WARNING ITMS-90725: "SDK Version Issue. This app was built with the iOS 12.0 SDK. Starting March 2019, all iOS apps submitted to the App Store must be built with the iOS 12.1 SDK or later, included in Xcode 10.1 or later.
My project was developed in swift 4.2.1 and xcode 10.1
Best Answer
Make sure you have the latest version of Xcode.
If you do have Xcode 10.1 (or later) this is just a reminder that all of your apps need to comply with these terms.
Also regardless of Xcode version if your app did archive/build successfully you have nothing to worry about at the moment.
EDIT:
Now ALL APPS and GAMES submitted to the AppStore must have the 12.1 SDK or they will be rejected.
If your app is still rejected and you have Xcode 10.1 (or later), update Xcode or reinstall, as the SDK was not integrated correctly by the system.