Almost every launch of the application on any Xcode 9 simulator results in that in the screenshot:
Maybe someone encountered this problem and solved it?
You can try to switch render engine to OpenGl instead of metal
Use this command in terminal.
defaults write com.apple.CoreSimulator.IndigoFramebufferServices FramebufferRendererHint 2
(1 = Metal, 2 = force use of OpenGL, 3 = OpenGL)
Or if your gpu is HD3000 you need to use
defaults write com.apple.CoreSimulator.IndigoFramebufferServices FramebufferEmulationHint 1
来源：https://stackoverflow.com/questions/46831145/the-spoiled-simulator-xcode-9-as-a-broken-tv