Xcode Error on Simulator: MGIsDeviceOneOfType is not supported on this platform

MobileGestalt

The libMobileGestalt.dylib provides a central repository for all of the iOS's properties. It can be analogous to OS X's Gestalt, which is part of CoreServices. OS X's Gestalt is documented for example Gestalt Manager and has been deprecated as of 10.8. MobileGestalt is entirely undocumented by Apple as it is a private library.

MobileGestalt allows for the testing of system properties that may or may not be compatible on different simulators.

Quite a few system processes and apps in iOS rely on MobileGestalt, which is located at /usr/lib/libMobileGestalt.dylib. It's more of a basic library, but its exposed APIs follow the Apple framework conventions and uses the MG API prefix for example MGIsDeviceOneOfType.

If you look for MobileGestalt on the iOS filesystem you won't find it - like all private frameworks and libraries, it has been prelinked into the /System/Library/Caches/...etc. If you like hacking and pen-testing then you can use tools to extract it.

MobileGestalt provides plenty of information - around 200 or so queries - on various aspects of the system. Here are a few.

libMobileGestalt.dylib
//Answers to MG queries

MGCopyAnswer(@"5MSZn7w3nnJp22VbpqaxLQ");
MGCopyAnswer(@"7mV26K/1a+wTtqiunvHMUQ");
MGCopyAnswer(@"BasebandAPTimeSync");
MGCopyAnswer(@"BasebandPostponementStatus");
MGCopyAnswer(@"BasebandPostponementStatusBlob");
MGCopyAnswer(@"BasebandSecurityInfoBlob");
MGCopyAnswer(@"BasebandStatus");
MGCopyAnswer(@"BuildVersion");
MGCopyAnswer(@"CoreRoutineCapability");
MGCopyAnswer(@"DeviceClass");
MGCopyAnswer(@"DeviceClassNumber");
MGCopyAnswer(@"DeviceName");
MGCopyAnswer(@"DeviceSupports1080p");
MGCopyAnswer(@"DeviceSupports720p");
MGCopyAnswer(@"DiskUsage");
MGCopyAnswer(@"GSDeviceName");
MGCopyAnswer(@"HWModelStr");
MGCopyAnswer(@"HasBaseband");
MGCopyAnswer(@"InternalBuild");
MGCopyAnswer(@"InverseDeviceID");
MGCopyAnswer(@"IsSimulator");
MGCopyAnswer(@"MLBSerialNumber");
MGCopyAnswer(@"MaxH264PlaybackLevel");
MGCopyAnswer(@"MinimumSupportediTunesVersion");
MGCopyAnswer(@"PasswordConfigured");
MGCopyAnswer(@"PasswordProtected");
MGCopyAnswer(@"ProductType");
MGCopyAnswer(@"ProductVersion");
MGCopyAnswer(@"RegionCode");
MGCopyAnswer(@"RegionalBehaviorNTSC");
MGCopyAnswer(@"RegionalBehaviorNoPasscodeLocationTiles");
MGCopyAnswer(@"ReleaseType");
MGCopyAnswer(@"SIMStatus");

There are hundreds more e.g. AirplaneMode, MobileEquipmentIdentifier, etc.

MobileGestalt maintains a table of OSType selector codes. for example c:890 in the message: libMobileGestalt MobileGestalt.c:890: MGIsDeviceOneOfType is not supported on this platform. In this case MGIsDeviceOneOfType is a method/property of the MobileGestalt library.

Instead of checking the simulator version there is a separate selector for directly querying the capabilities of the simulator. The messages most likely indicate incompatibilities between simulator versions and Xcode versions and/or unsupported APIs on the simulator.

I've successfully dropped it with the disabling of the project garbage.

Go to <Name of your Project>->Scheme->Edit Scheme Then go to Run (menu to the left side) and add the following environment variable:

Name:OS_ACTIVITY_MODE, Value: disable

in my case: check your app delegate for method - didFinishLaunching. I had private and get the error. After remove "private" everything works fine

I just installed Xcode 10 Beta and had the same problem. Ran Xcode 9.4.1 and the problem went away.