问题
I trying to add device conditions in my Xcode 11 so that I can simulate a slower network connection. However, when opening Devices and Simulators window and making sure my device is selected, it says that 'No Conditions Available'
How do I make them appear?
回答1:
I finally managed to fix this. It appears that you need to have a 'Network Link Conditioner' installed on your Mac (in my case Catalina) for the the option to appear in Devices and Simulator window. To install it, go to Downloads for Apple Developers and download 'Additional Tools for Xcode 11'. Once downloaded, you can find it in the Hardware folder. Interestingly, when trying to install it, I received the following error:
“Network Link Conditioner” preferences is installed with macOS and can’t be replaced.
Despite me unable to find it in preferences. Luckily there is an easy fix described in this answer.
回答2:
I had the same issue. Try to install the latest system software updates (Xcode Command Line Tools in my case). It worked for me.
来源：https://stackoverflow.com/questions/58758261/xcode-11-no-device-conditions-available