问题
I am encountering very bad problem using Sierra + xcode 8 + iOS Simulator: I develop midi application, but now , when I start the iOS Simulator I get no midi-port available, I mean: Usualle using Studio Midi is possible to see the virtual iOS device, plus you can see se the session, typically named Session 1. being this is possible to re-route the MidiNetwork ( midi_driver ) to a physical port, but now, using Sierra the iOS Simulatore is not visible no longer, and I do not know ( and where to find ) a solution. Very bad situation because it stopped the developing and code-production. Any Good idea to solve this????
then I tried: 1 - Removing duplicates of the CoreMIDI.Framework in project
2 - Product > Clean
3 - Run the iOS Simulator
but nothing still works
来源：https://stackoverflow.com/questions/40856039/ios-simulator-in-sierra-studio-midi-does-not-work