问题
I wanted to try my app on iPhone 6
with iOS 10.3.3
but I couldn't find iOS 10.3.3
in simulators
any ideas are welcome
回答1:
Unfortunately you can't download it from this window, as Apple does not release/provides simulator for each version/subversions of iOS.
Here I've simulator list with Xcode 9.3, Component window. It seems apple has not provided simulator for 10.3.3.

You can also add/find a simulator from Xcode Target:
Open simulator list against your Xcode target and Add Additional Simulators...
Switch to Simulators and click on +
Select Device Type, iOS Version and Create simulator.
来源:https://stackoverflow.com/questions/47159960/how-to-download-ios-10-3-3-simulator