xcode10.3 xib编译

 Failed to find or create execution context for description '<IBCocoaTouchPlatformToolDescription: 0x7fbe60701e50> System content for IBCocoaTouchFramework-EightAndLater <IBScaleFactorDeviceTypeDescription: 0x7fbe607085a0> scaleFactor=2x'. These intermediate objects were non-nil: (

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService