iOS Question Crash on iOS 26 when a Page with CustomListView also has ToolBarButtons (reproducible)

[marcick]

Hi everyone,
while testing my app on iOS 26, I encountered a crash that seems to be caused by a conflict between CustomListView and ToolBarButtons.
I’ve created a minimal project that reliably reproduces the issue (attached).

The sample project contains 2 pages:

• PageMain
  – Has a ToolBarButton
  – Contains a button that opens the second page
• PageLocList
  – Has a ToolBarButton
  – Contains a CustomListView

When I tap the button on PageMain to navigate to PageLocList, the app crashes immediately.

The crash DOES NOT happen if:​

1. I remove the ToolBarButton from PageMain, or
2. I remove the ToolBarButton from PageLocList, or
3. I remove the CustomListView from PageLocList

Error occurred on line: 32 (Main)
Expected: B4IPanelView, object type: _UITouchPassthroughView
Stack Trace: (
  CoreFoundation       __exceptionPreprocess + 172
  libobjc.A.dylib      objc_exception_throw + 72
  CoreFoundation       -[NSException initWithCoder:] + 0
  test                 -[B4IObjectWrapper setObject:] + 128
  test                 -[B4IScrollView Panel] + 136
  test                 -[B4IScrollView setContentWidth:] + 116
  test                 -[B4XViewWrapper setScrollViewContentWidth:] + 40
  test                 -[b4i_customlistview _base_resize::] + 356
  CoreFoundation       __invoking___ + 144
  CoreFoundation       -[NSInvocation invoke] + 276
 test                 +[B4I runDynamicMethod:method:throwErrorIfMissing:args:] + 776
 test                 -[B4I raiseEvent:event:params:] + 292
 test                 +[B4IObjectWrapper raiseEvent:::] + 168
 test                 __30-[B4IPanelView layoutSubviews]_block_invoke + 468
 libdispatch.dylib    _dispatch_call_block_and_release + 24
 libdispatch.dylib    _dispatch_client_callout + 12
 libdispatch.dylib    _dispatch_main_queue_drain.cold.7 + 24
 libdispatch.dylib    _dispatch_main_queue_drain + 1184
 libdispatch.dylib    _dispatch_main_queue_callback_4CF + 40
 CoreFoundation       __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
 CoreFoundation       __CFRunLoopRun + 1884
 CoreFoundation       _CFRunLoopRunSpecificWithOptions + 496
 GraphicsServices     GSEventRunModal + 116
 UIKitCore            -[UIApplication _run] + 772
 UIKitCore            UIApplicationMain + 124
 test                 main + 96
 dyld                 start_sim + 20
 ???                  0x0 + 4313009492
)
SignalHandler 6

Any Idea?
Attached the sample project
Thanks

 

[Erel]

Confirmed. Workaround for now is to disable liquid glass. Add this to main module:

#PlistExtra: <key>UIDesignRequiresCompatibility</key><true/>

I will upload an updated core library that will fix it. Probably on Thursday.

 

[Erel]

I've uploaded an updated iCore library to the builders. It fixes this issue.

If using a local builder then you can download it from: www.b4x.com/b4i/files/iCore.zip (B4i v10+).