Update
Above I was using Xcode 12 For Universal Apps Beta 2 (which does not include the iOS SDK)
Just saw that Xcode 12 Beta 6 now includes developing Universal Apps too
No longer crashes when running
There are no warnings when compiled and running natively for macOS (Apple silicon)
But some some warnings below when run for Mac under Rosetta (Intel) in case its useful to know
I will see if making code changes can stop the warning from occurring (am presenting a debug UIAlertController on load of the app)
2020-09-05 16:15:08.625111+0100 MacCatalystDemo[3428:333998] [default] [ERROR] - Unable to create and lookup port "com.apple.CoreDisplay.master" => 1102
0	 		0x7fff2a896d58 CoreDisplay::Mach::Port::Port(std::1::basic_string<char, std::1::char_traits<char>, std::__1::allocator<char> >, CoreDisplay::Mach::Port::PortLookup) + 388
1	 		0x7fff2a807668 CoreDisplay_Display_GetPotentialHeadroom + 155
2	 		0x7fff276eeaa4 -[NSCGSDisplay initWithDisplayID:flipOffset:] + 809
3	 		0x7fff276ee69f ___NSCGSCreateDisplaysFromDisplayIDsUsingPredicate_block_invoke + 68
4	 		0x7fff276ee530 _NSCGSCreateArrayUsingBlock + 174
5	 		0x7fff27e04af0 _NSCGSDisplayConfigurationUpdate + 1074
6	 			 0x10cf304dc _dispatch_client_callout + 8
7	 			 0x10cf31c58 _dispatch_once_callout + 87
8	 		0x7fff27e03e7a _NSCGSDisplayConfigurationGetCurrent + 94
9	 		0x7fff276edf99 _NSScreenConfigurationUpdateSharedInfoForReason + 365
10 		0x7fff276edde2 ___NSScreenConfigurationEnsureInitialUpdateOccurred_block_invoke + 105
11 			 0x10cf304dc _dispatch_client_callout + 8
12 			 0x10cf31c58 _dispatch_once_callout + 87
13 		0x7fff276edd77 +[_NSScreenConfiguration prepare] + 35
14 		0x7fff276edd4d -[NSApplication(ScreenHandling) _registerForDisplayChangedNotifications] + 100
15 		0x7fff276e60d3 -[NSApplication init] + 1612
16 		0x7fff276e5866 +[NSApplication sharedApplication] + 120
17 		0x7fff66b04c5e UINSApplicationInstantiate + 62
18 		0x7fff79b93d55 UIApplicationMain + 136
19 			 0x1047970ab main + 75
20 		0x7fff715a3651 start + 1
2020-09-05 16:15:08.641239+0100 MacCatalystDemo[3428:333998] [default] [ERROR] - GetLatestRealtimeDisplayInfoMemory: Fail to get RealtimeDisplayInfoShmem port
2020-09-05 16:15:08.644389+0100 MacCatalystDemo[3428:333998] [default] [ERROR] - Unable to create and lookup port "com.apple.CoreDisplay.master" => 1102
0	 		0x7fff2a896d58 CoreDisplay::Mach::Port::Port(std::1::basic_string<char, std::1::char_traits<char>, std::__1::allocator<char> >, CoreDisplay::Mach::Port::PortLookup) + 388
1	 		0x7fff2a8078b5 CoreDisplay_Display_GetReferenceHeadroom + 155
2	 		0x7fff276eeab6 -[NSCGSDisplay initWithDisplayID:flipOffset:] + 827
3	 		0x7fff276ee69f ___NSCGSCreateDisplaysFromDisplayIDsUsingPredicate_block_invoke + 68
4	 		0x7fff276ee530 _NSCGSCreateArrayUsingBlock + 174
5	 		0x7fff27e04af0 _NSCGSDisplayConfigurationUpdate + 1074
6	 			 0x10cf304dc _dispatch_client_callout + 8
7	 			 0x10cf31c58 _dispatch_once_callout + 87
8	 		0x7fff27e03e7a _NSCGSDisplayConfigurationGetCurrent + 94
9	 		0x7fff276edf99 _NSScreenConfigurationUpdateSharedInfoForReason + 365
10 		0x7fff276edde2 ___NSScreenConfigurationEnsureInitialUpdateOccurred_block_invoke + 105
11 			 0x10cf304dc _dispatch_client_callout + 8
12 			 0x10cf31c58 _dispatch_once_callout + 87
13 		0x7fff276edd77 +[_NSScreenConfiguration prepare] + 35
14 		0x7fff276edd4d -[NSApplication(ScreenHandling) _registerForDisplayChangedNotifications] + 100
15 		0x7fff276e60d3 -[NSApplication init] + 1612
16 		0x7fff276e5866 +[NSApplication sharedApplication] + 120
17 		0x7fff66b04c5e UINSApplicationInstantiate + 62
18 		0x7fff79b93d55 UIApplicationMain + 136
19 			 0x1047970ab main + 75
20 		0x7fff715a3651 start + 1
shagun-ustwo
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