错误

Loaded CoreSimulatorService is no longer valid for this process.  Simulator services will no longer be available.  Error=Error Domain=NSPOSIXErrorDomain Code=61 "Connection refused" UserInfo={NSLocalizedDescription=CoreSimulator.framework was changed while the process was running.  This is not a supported configuration and can occur if Xcode.app was updated while the process was running.  Service version (944.5) does not match expected service version (932.2).}

很奇怪的现象，昨天还正常今天就不能用了。

解决方法

Mac > Storage > Manage > Developer

删除所有缓存，然后它就能正常工作了。