IOS13 iPad Settings crashing for already paid app - ipad

Question

Our apps on the AppStore have been running for years without any issues. However, since the release of iOS 13, although apps still working fine, but going into
iPad Settings -> MyApp
Crashes and the settings app would end, no issues with previous iOS releases whatsoever.
I looked on the Device Logs from the XCODE Organiser, and can see the following in the logs:
Incident Identifier: DC00F244-958C-407F-BDC9-CFD7D6C3D8C8
CrashReporter Key: e5b2979fc92fb936e83ef8fdab74fbd1c0707ce3
Hardware Model: iPad6,4
Process: Preferences [530]
Path: /Applications/Preferences.app/Preferences
Identifier: com.apple.Preferences
Version: 161.2 (1)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.apple.Preferences [634]
Date/Time: 2019-10-05 06:18:38.6274 +0100
Launch Time: 2019-10-05 06:18:17.3730 +0100
OS Version: iPhone OS 13.1.2 (17A860)
Release Type: User
Baseband Version: 7.00.01
Report Version: 104
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001a581fefc
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [530]
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libswiftCore.dylib 0x00000001a581fefc specialized _assertionFailure+ 2154236 (_:_:file:line:flags:) + 440
1 libswiftCore.dylib 0x00000001a581fefc specialized _assertionFailure+ 2154236 (_:_:file:line:flags:) + 440
2 libswiftCore.dylib 0x00000001a563b64c _assertionFailure+ 169548 (_:_:file:line:flags:) + 32
3 SettingsUIKitPrivate 0x00000001bfce0c24 0x1bfcda000 + 27684
4 SettingsUIKitPrivate 0x00000001bfce0fd4 0x1bfcda000 + 28628
5 SwiftUI 0x00000001cd28d86c Binding.init+ 6629484 (get:set:) + 144
6 SettingsUIKitPrivate 0x00000001bfcdf654 0x1bfcda000 + 22100
7 SettingsUIKitPrivate 0x00000001bfcdca54 0x1bfcda000 + 10836
8 SettingsUIKitPrivate 0x00000001bfcdc44c 0x1bfcda000 + 9292
9 SwiftUI 0x00000001cccf88e4 DynamicPropertyBody.update+ 776420 (context:) + 1768
10 SwiftUI 0x00000001cccf9070 protocol witness for static UntypedAttribute._update+ 778352 (_:graph:attribute:) in conformance DynamicPropertyBody<A> + 36
11 AttributeGraph 0x00000001c248e458 partial apply + 28
12 AttributeGraph 0x00000001c2476a60 AG::Graph::UpdateStack::update+ 14944 () + 984
13 AttributeGraph 0x00000001c2476d24 AG::Graph::update_attribute+ 15652 (unsigned int, bool) + 372
14 AttributeGraph 0x00000001c2479e9c AG::Graph::value_ref+ 28316 (AG::attribute_t, AGTypeID, bool*) + 116
15 AttributeGraph 0x00000001c24815ac AG::Graph::EntryExit::update_entry+ 58796 () const + 64
16 AttributeGraph 0x00000001c2476a60 AG::Graph::UpdateStack::update+ 14944 () + 984
17 AttributeGraph 0x00000001c2476d24 AG::Graph::update_attribute+ 15652 (unsigned int, bool) + 372
18 AttributeGraph 0x00000001c2479e9c AG::Graph::value_ref+ 28316 (AG::attribute_t, AGTypeID, bool*) + 116
19 AttributeGraph 0x00000001c24879e4 AGGraphGetValue + 48
20 SwiftUI 0x00000001cce25c20 ViewGraph.sizeThatFits+ 2010144 (_:) + 100
21 SwiftUI 0x00000001cd2e0520 specialized ListItemHost<>.hostSizeThatFits+ 6968608 (width:) + 120
22 SwiftUI 0x00000001ccefb250 #objc ListCoreCellHost.sizeThatFits+ 2884176 (_:) + 48
23 UIKitCore 0x000000019c666b98 -[UITableViewCell systemLayoutSizeFittingSize:withHorizontalFittingPriority:verticalFittingPriority:] + 592
24 UIKitCore 0x000000019c6dce38 -[UITableView _heightForCell:atIndexPath:] + 436
25 UIKitCore 0x000000019c6c544c __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 2568
26 UIKitCore 0x000000019c971d08 +[UIView+ 15129864 (Animation) performWithoutAnimation:] + 96
27 UIKitCore 0x000000019c6c495c -[UITableView _configureCellForDisplay:forIndexPath:] + 248
28 UIKitCore 0x000000019c6d5a04 -[UITableView _createPreparedCellForGlobalRow:withIndexPath:willDisplay:] + 796
29 UIKitCore 0x000000019c6a338c -[UITableView _updateVisibleCellsNow:] + 2608
30 UIKitCore 0x000000019c6c04b0 -[UITableView layoutSubviews] + 160
31 SwiftUI 0x00000001ccef4438 UpdateCoalescingTableView.layoutSubviews+ 2855992 () + 56
32 SwiftUI 0x00000001ccef45e4 #objc UpdateCoalescingTableView.layoutSubviews+ 2856420 () + 28
33 UIKitCore 0x000000019c97f270 -[UIView+ 15184496 (CALayerDelegate) layoutSublayersOfLayer:] + 2140
34 QuartzCore 0x000000019ee6b5f8 -[CALayer layoutSublayers] + 284
35 QuartzCore 0x000000019ee6fe28 CA::Layer::layout_if_needed+ 1396264 (CA::Transaction*) + 480
36 QuartzCore 0x000000019ee7b894 CA::Layer::layout_and_display_if_needed+ 1443988 (CA::Transaction*) + 136
37 QuartzCore 0x000000019edc49f0 CA::Context::commit_transaction+ 694768 (CA::Transaction*, double) + 304
38 QuartzCore 0x000000019edee890 CA::Transaction::commit+ 866448 () + 676
39 QuartzCore 0x000000019edef284 CA::Transaction::observer_callback+ 868996 (__CFRunLoopObserver*, unsigned long, void*) + 92
40 CoreFoundation 0x0000000198463c48 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
41 CoreFoundation 0x000000019845eb34 __CFRunLoopDoObservers + 416
42 CoreFoundation 0x000000019845f100 __CFRunLoopRun + 1308
43 CoreFoundation 0x000000019845e8bc CFRunLoopRunSpecific + 464
44 GraphicsServices 0x00000001a22ca328 GSEventRunModal + 104
45 UIKitCore 0x000000019c4f46d4 UIApplicationMain + 1936
46 Preferences 0x0000000104869974 0x104860000 + 39284
47 libdyld.dylib 0x00000001982e9460 start + 4
Thread 1:
0 libsystem_pthread.dylib 0x0000000198206ad8 start_wqthread + 0
Thread 2:
0 libsystem_pthread.dylib 0x0000000198206ad8 start_wqthread + 0
Thread 3 name: com.apple.uikit.eventfetch-thread
Thread 3:
0 libsystem_kernel.dylib 0x00000001982bd5f4 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001982bca60 mach_msg + 72
2 CoreFoundation 0x0000000198464068 __CFRunLoopServiceMachPort + 216
3 CoreFoundation 0x000000019845f188 __CFRunLoopRun + 1444
4 CoreFoundation 0x000000019845e8bc CFRunLoopRunSpecific + 464
5 Foundation 0x000000019879e994 -[NSRunLoop+ 31124 (NSRunLoop) runMode:beforeDate:] + 228
6 Foundation 0x000000019879e874 -[NSRunLoop+ 30836 (NSRunLoop) runUntilDate:] + 88
7 UIKitCore 0x000000019c58c49c -[UIEventFetcher threadMain] + 152
8 Foundation 0x00000001988cf0b0 __NSThread__start__ + 848
9 libsystem_pthread.dylib 0x00000001982031ec _pthread_start + 124
10 libsystem_pthread.dylib 0x0000000198206aec thread_start + 8
Thread 4:
0 libsystem_pthread.dylib 0x0000000198206ad8 start_wqthread + 0
Thread 5:
0 libsystem_pthread.dylib 0x0000000198206ad8 start_wqthread + 0
Thread 6 name: com.apple.NSURLConnectionLoader
Thread 6:
0 libsystem_kernel.dylib 0x00000001982bd5f4 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001982bca60 mach_msg + 72
2 CoreFoundation 0x0000000198464068 __CFRunLoopServiceMachPort + 216
3 CoreFoundation 0x000000019845f188 __CFRunLoopRun + 1444
4 CoreFoundation 0x000000019845e8bc CFRunLoopRunSpecific + 464
5 CFNetwork 0x000000019b6d9e68 0x19b6d8000 + 7784
6 Foundation 0x00000001988cf0b0 __NSThread__start__ + 848
7 libsystem_pthread.dylib 0x00000001982031ec _pthread_start + 124
8 libsystem_pthread.dylib 0x0000000198206aec thread_start + 8
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0xe000000000000000 x1: 0x0000000280915800 x2: 0x0000000000000007 x3: 0x00000001981ce0dc
x4: 0x0000000000000000 x5: 0x000000016b59a5f0 x6: 0x0000000000000072 x7: 0x0000000000000c70
x8: 0x00000000dfc24834 x9: 0x000000000000007f x10: 0x0000000000000031 x11: 0x00000000000007fb
x12: 0x00000000000007fd x13: 0x0000000000000000 x14: 0x00000000dfe25000 x15: 0x000000000000004a
x16: 0x0000000080000000 x17: 0x000000005fe00000 x18: 0x0000000000000000 x19: 0x00000001bfcfd020
x20: 0x0000000000000002 x21: 0x0000000000000000 x22: 0x00000000000000a8 x23: 0x0000000000000000
x24: 0xe000000000000000 x25: 0x000000000000000b x26: 0x0000000000000000 x27: 0x0000000000000095
x28: 0x00000001bfce0fbc fp: 0x000000016b59a790 lr: 0x00000001a581fefc
sp: 0x000000016b59a710 pc: 0x00000001a581fefc cpsr: 0x60000000
esr: 0xf2000001 Address size fault
I'm scratching my head on this one, the app works fine, just the settings having this issue.
I have a plan about how to diagnose and fix and hopefully should resolve soon but wondered if anyone has seen this yet?
Thanks

Answer 1

Finally, after few hours of going through the settings, code, etc, I finally fixed it.
The approach was to:
1) Edit my APP setting's info.plist file (as text) and take out all sections into text editor, the file almost becomes blank.
2) Re-compile and run on the iPad -> STOP APP -> Go to Settings -> Click on the APP, it now works fine without my settings, so, I thought something must have caused all this.
3) Started pasting back part-by-part into the info.plist file until I finally got the offending section, which was below:
<dict>
<key>AutocapitalizationType</key>
<string>None</string>
<key>AutocorrectionType</key>
<string>No</string>
<key>DefaultValue</key>
<string>8101</string>
<key>IsSecure</key>
<string>No</string>
<key>Key</key>
<string>Admin_iTaxi Server Port</string>
<key>KeyboardType</key>
<string>NumberPad</string>
<key>Title</key>
<string>Server Port </string>
<key>Type</key>
<string>PSTextFieldSpecifier</string>
</dict>
4) Looked very strange and bizarre, ... I mean what could possibly be wrong with the above chunk?!... and why was this working on all iOSes until the latest iOS13!?...
5) Checked all spelling, re-ordered the list to make it similar to another one that does work, changed the keyboard type, other items,... started-Stopped, checked settings, same thing,... still crashing!...
6) Finally, I changed the variable name from "Admin_iTaxi Server Port" to "Admin_iTaxi Server XXXPort", re-compiled, and it worked... hmmm... why!?...
7) Went back into the startup code, and noticed that I am setting the variables (if they don't exists) with the following:
if (!IsConfigKeyExist(#"Admin_iTaxi Server Port"))
{
TempServerPortAdmin = 8102;
[[NSUserDefaults standardUserDefaults] setInteger:TempServerPortAdmin forKey:#"Admin_iTaxi Server Port"];
}
8) I then thought, the info.plist file has KEYs and TYPEs, all are set as , can't remember setting any or etc, therefore.
9) Changed the code above into:
if (!IsConfigKeyExist(#"Admin_iTaxi Server Port"))
{
TempServerPortAdmin = 8102;
[[NSUserDefaults standardUserDefaults] setValue:[NSString stringWithFormat:#"%li", TempServerPortAdmin] forKey:#"Admin_iTaxi Server Port"];
}
10) Restored the original variable name on the info.plist, start-stop-check, ... Eureeka,.. it now works...
Conclusion: somehow down the line Apple in their wisdom decided to crash the settings app when they read an Integer into a String variable... why!?... I have no idea, but the fix (as mentioned above), is NOT to store your settings as "Integer" and infect only store as "String" especially if you are going to use these settings in your info.plist file.
This solves the problem of the app's settings crashing with EXC_BREAKPOINT (SIGTRAP)
I hope this helps.
Good luck!