My XCode version is 11.1 and the iPhone OS version is 14.0.1. To run apps on iOS 14 device, it requires XCode 12.
An alternate option to support iOS 14 in XCode 11, is to add Device Support. So I have added Device Support for iOS 14 in the following way -
Goto Applications > Xcode > Right Click > Show Package Contents > Contents > Developer > Platforms > iPhoneOS.platform > DeviceSupport
Then added the device support files in this directory.
Device Support files are available here - https://github.com/filsv/iPhoneOSDeviceSupport
After adding Device support, whenever I try to run it on the iPhone device, it instantly shows a 'Build Successful' message, then XCode crashes.
Here is the build error log -
Process: Xcode [1314]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 11.1 (15405)
Build Info: IDEFrameworks-15405000000000000~13
App Item ID: 497799835
App External ID: 832925179
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [1314]
User ID: 501
Date/Time: 2021-03-31 20:33:14.126 +0600
OS Version: Mac OS X 10.14.6 (18G95)
Report Version: 12
Bridge OS Version: 3.6 (16P6571)
Anonymous UUID: 13DE45B0-BCED-AB3D-BEDF-B4704CEFE0C2
Time Awake Since Boot: 630 seconds
System Integrity Protection: enabled
Crashed Thread: 18 Dispatch queue: Mutex to protect _hasPerformedWorkerAction
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Application Specific Information:
com.apple.main-thread
ProductBuildVersion: 11A1027
UNCAUGHT EXCEPTION (NSInternalInconsistencyException): Invalid parameter not satisfying: aString != nil
UserInfo: (null)
Hints:
0: Calling block provided to DVTSyncPerformBlock() here:
0 DVTSyncPerformBlock (in DVTFoundation)
1 -[IDEExecutionRunnableTracker executionWantsHold:withError:] (in IDEFoundation)
2 -[IDERunOperationWorker _startWithRetrying:] (in IDEFoundation)
3 __44-[IDERunOperationWorker _startWithRetrying:]_block_invoke_3 (in IDEFoundation)
4 __48-[DVTDispatchLock_Recursive performLockedBlock:]_block_invoke (in DVTFoundation)
5 _dispatch_client_callout (in libdispatch.dylib)
6 _dispatch_lane_barrier_sync_invoke_and_complete (in libdispatch.dylib)
7 DVTDispatchBarrierSync (in DVTFoundation)
8 -[DVTDispatchLock performLockedBlock:] (in DVTFoundation)
9 -[DVTDispatchLock_Recursive performLockedBlock:] (in DVTFoundation)
10 __44-[IDERunOperationWorker _startWithRetrying:]_block_invoke_2 (in IDEFoundation)
11 __DVT_CALLING_CLIENT_BLOCK__ (in DVTFoundation)
12 __DVTDispatchAfter_block_invoke (in DVTFoundation)
13 _dispatch_client_callout (in libdispatch.dylib)
14 _dispatch_continuation_pop (in libdispatch.dylib)
15 _dispatch_source_invoke (in libdispatch.dylib)
16 _dispatch_continuation_pop (in libdispatch.dylib)
17 _dispatch_async_redirect_invoke (in libdispatch.dylib)
18 _dispatch_root_queue_drain (in libdispatch.dylib)
19 _dispatch_worker_thread2 (in libdispatch.dylib)
20 _pthread_wqthread (in libsystem_pthread.dylib)
21 start_wqthread (in libsystem_pthread.dylib)
Backtrace:
0 __exceptionPreprocess (in CoreFoundation)
1 DVTFailureHintExceptionPreprocessor (in DVTFoundation)
2 objc_exception_throw (in libobjc.A.dylib)
3 +[NSException raise:format:arguments:] (in CoreFoundation)
4 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] (in Foundation)
5 -[NSCell _objectValue:forString:errorDescription:] (in AppKit)
6 -[NSCell setStringValue:] (in AppKit)
7 -[NSControl setStringValue:] (in AppKit)
8 -[IDEExecutionHoldAlertHelper showAlert] (in IDEKit)
9 -[IDEWorkspaceTabController showExecutionHoldAlertWithError:] (in IDEKit)
10 __55-[IDEWorkspaceDocument _setupLaunchSessionsObservation]_block_invoke_2 (in IDEKit)
11 -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation)
12 NSKeyValueNotifyObserver (in Foundation)
13 NSKeyValueDidChange (in Foundation)
14 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:maybeNewValuesDict:usingBlock:] (in Foundation)
15 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] (in Foundation)
16 _NSSetCharValueAndNotify (in Foundation)
17 -[IDEExecutionTracker _updateWantsHold] (in IDEFoundation)
18 __37-[IDEExecutionTracker addSubtracker:]_block_invoke (in IDEFoundation)
19 -[DVTObservingBlockToken observeValueForKeyPath:ofObject:change:context:] (in DVTFoundation)
20 NSKeyValueNotifyObserver (in Foundation)
21 NSKeyValueDidChange (in Foundation)
22 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:maybeNewValuesDict:usingBlock:] (in Foundation)
23 -[NSObject(NSKeyValueObservingPrivate) _changeValueForKey:key:key:usingBlock:] (in Foundation)
24 _NSSetCharValueAndNotify (in Foundation)
25 __60-[IDEExecutionRunnableTracker executionWantsHold:withError:]_block_invoke (in IDEFoundation)
26 __DVT_CALLING_CLIENT_BLOCK__ (in DVTFoundation)
27 __DVTSyncPerformBlock_block_invoke.48 (in DVTFoundation)
28 DVTInvokeWithLazyFailureHint (in DVTFoundation)
29 __DVTSyncPerformBlock_block_invoke (in DVTFoundation)
30 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ (in CoreFoundation)
31 __CFRunLoopDoBlocks (in CoreFoundation)
32 __CFRunLoopRun (in CoreFoundation)
33 CFRunLoopRunSpecific (in CoreFoundation)
34 RunCurrentEventLoopInMode (in HIToolbox)
35 ReceiveNextEventCommon (in HIToolbox)
36 _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox)
37 _DPSNextEvent (in AppKit)
38 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (in AppKit)
39 -[DVTApplication nextEventMatchingMask:untilDate:inMode:dequeue:] (in DVTKit)
40 -[NSApplication run] (in AppKit)
41 NSApplicationMain (in AppKit)
42 main (in Xcode)
43 start (in libdyld.dylib)
abort() called
Application Specific Signatures:
NSInternalInconsistencyException
There has been a security enhancement that stops Xcode 11 working with iOS 14 (the probable underlying reason causing the crash) but there is a workaround (and lots of other helpful information) at https://betterprogramming.pub/debugging-on-ios-14-with-xcode-11-d332f12f49dd which explains how to launch, log and debug.