Invalid Numeric Value (NaN) Error in SwiftUI's TextField on Long-Press

I am seeing the same problem. This also happens in UIKit. A "long press" on the TextField reproduces the problem. Adding a UITextField inside a View is enough the reproduce the problem. I think this is a bug that Apple should address?

I have the same issue .. however .. while it does occur on a long press, it also occurs anytime I type in the textfield. Occurs with minimal code example, in simulator and on device - using both on-screen keyboard and hardware keyboard. Driving me insane!!

Adding CG_NUMERICS_SHOW_BACKTRACE to Environment Variables as the error suggests, provides the following backtrace. I don't find it very informative - but perhaps it can provide some clues to other more intelligent individuals:

Error: this application, or a library it uses, has passed an invalid numeric value (NaN, or not-a-number) to CoreGraphics API and this value is being ignored. Please fix this problem.
Backtrace:
  <CGPathMoveToPoint+84>
   <+[UIBezierPath _continuousRoundedRectBezierPath:withRoundedCorners:cornerRadii:segments:smoothPillShapes:]+1120>
    <+[UIBezierPath _continuousRoundedRectBezierPath:withRoundedCorners:cornerRadius:segments:]+180>
     <+[UIBezierPath _roundedRectBezierPath:withRoundedCorners:cornerRadius:segments:legacyCorners:]+340>
      <-[_UITextChoiceAccelerationBubble backgroundImageView]+156>
       <-[_UITextChoiceAccelerationBubble anchorToTextIfNeeded]+500>
        <-[_UITextChoiceAccelerationBubble updateTextAnchorForParentView:]+156>
         <-[_UITextChoiceAccelerationBubble updateTextBoxHighlightForRect:inTextView:parentView:highlightColor:]+88>
          <-[_UITextChoiceAccelerationAssistant updateActivePromptForCandidate:displayRects:highlightOnly:]+352>
           <-[UIKeyboardImpl updateAutocorrectPrompt:correctionRects:]+492>
            <-[UIKeyboardImpl updateAutocorrectPrompt:executionContext:]+608>
             <__45-[UIKeyboardImpl touchAutocorrectPromptTimer]_block_invoke+112>
              <__56-[UIKeyboardScheduledTask handleDeferredTimerFiredEvent]_block_invoke+184>
               <-[UIKeyboardTaskEntry execute:]+200>
                <-[UIKeyboardTaskQueue continueExecutionOnMainThread]+304>
                 <-[UIKeyboardTaskQueue addTask:]+92>
                  <-[UIKeyboardScheduledTask handleDeferredTimerFiredEvent]+216>
                   <__invoking___+144>
                    <-[NSInvocation invoke]+276>
                     <-[_UIActionWhenIdle invoke]+52>
                      <__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+32>
                       <__CFRunLoopDoObservers+528>
                        <__CFRunLoopRun+968>
                         <CFRunLoopRunSpecific+572>
                          <GSEventRunModal+160>
                           <-[UIApplication _run]+868>
                            <UIApplicationMain+124>
                             <OUTLINED_FUNCTION_70+500>
                              <OUTLINED_FUNCTION_70+148>
                               <OUTLINED_FUNCTION_2+92>
                                <$s16FurtherIsolation0aB3AppV5$mainyyFZ+40>
                                 <main+12>
                                  104d81558
                                   104e62058                                    3125800000000000

On staring at the backtrace, and seeing continuousRoundedRectBezierPath:withRoundedCorner and UITextMagnifiedLoupeView makes me think the error occurs whenever the new "pill shaped" text selection magnifier appears (long pressing is one case in which this text selection magnifier appears).

I think this is a bug on Apple's side. But surprised there is not more comments on the forums / StackOverflow, etc about this.

I can create a workaround to the issue by preventing the default long press and autocorrection behaviours (which will cause magnifiers or correction suggestions).

For me at least, this stops the warning (but - obviously - prevents text selection and autocorrection).

struct ContentView: View {
    @State private var text: String = ""
    @FocusState private var textfieldFocused: Bool
    
    var body: some View {
        TextField("Placeholder", text: $text)
            .focused($textfieldFocused)
            .onLongPressGesture(minimumDuration: 0.0) {
                textfieldFocused = true
            }
            .autocorrectionDisabled()
    }
}

Report filed via Feedback Assistant: FB13276843

Please file reports too - so that we can can some action on this. :)

I'm getting a similar message in the console but doing something completely unrelated. I am using the latest API of SwiftCharts with .ChartScrollableAxes(). On My chart, I'm adding a .annotation() that appears when tapping on a point in the chart. If I have the annotation showing and then I change the scale of my chart (say tapping 'year' scale instead of 'month' scale, then I get the console message.

Very weird and unrelated but I'll file a report too.

Console message: "[Unknown process name] Error: this application, or a library it uses, has passed an invalid numeric value (NaN, or not-a-number) to CoreGraphics API and this value is being ignored. Please fix this problem. [Unknown process name] If you want to see the backtrace, please set CG_NUMERICS_SHOW_BACKTRACE environmental variable."

iOS 17.2, Xcode Version 15.1 The problem has not yet been resolved.

Error: this application, or a library it uses, has passed an invalid numeric value (NaN, or not-a-number) to CoreGraphics API and this value is being ignored. Please fix this problem.

iOS 17.2 Xcode 15.1 This is happening for me on typing in textFields that have the textFieldStyle .roundedBorder applied. This is a system defined textFieldStyle so it looks like apple has a bug on their hands somewhere.

If i remove this modifier the warnings stop.