Webview.Scrollview - Unable to add more than 126 Objects - ios

Question

My Application is getting crashed while scrolling UIWebview - I have used ILPDFKit for implementing interactive PDF - Editable Forms.App is getting crashed only if i am adding more than 126 Objects.
Here is code I am using (from ILPDFKit)
for (PDFWidgetAnnotationView *element in widgetAnnotationViews)
{
element.alpha = 0;
element.parentView = self;
[_pdfView.scrollView addSubview:element];
[_pdfView.scrollView bringSubviewToFront:element];
if ([element isKindOfClass:[PDFFormButtonField class]])
{
[(PDFFormButtonField*)element setButtonSuperview];
}
}
I have also raise Issue here
I have added some customview's in my webview.scrollview , so while scrolling webview my App is getting crashed. i have checked for all possible solutions i found on google/stackoverflow.
none of the delegate method of scrollview / webview called before this crash , as soon as i tried to scroll and app is getting crashed.
below is crash report.
*** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSArrayM: 0x6000024535f0> was mutated while being enumerated.'
*** First throw call stack:
(
0 CoreFoundation 0x00000001045dd34b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x0000000103f5f21e objc_exception_throw + 48
2 CoreFoundation 0x0000000104645f1c __NSFastEnumerationMutationHandler + 124
3 CoreFoundation 0x0000000104582638 -[NSArray makeObjectsPerformSelector:] + 424
4 UIKit 0x00000001020d8f4f -[UIScrollView(UIScrollViewInternal) _notifyDidScroll] + 163
5 UIKit 0x00000001020c3919 -[UIScrollView setContentOffset:] + 478
6 UIKit 0x00000001020c8351 -[UIScrollView _updatePanGesture] + 2346
7 UIKit 0x0000000102531289 -[UIGestureRecognizerTarget _sendActionWithGestureRecognizer:] + 57
8 UIKit 0x0000000102539028 _UIGestureRecognizerSendTargetActions + 109
9 UIKit 0x0000000102536af7 _UIGestureRecognizerSendActions + 227
10 UIKit 0x0000000102535d83 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 891
11 UIKit 0x0000000102521e56 _UIGestureEnvironmentUpdate + 1395
12 UIKit 0x000000010252189b -[UIGestureEnvironment _deliverEvent:toGestureRecognizers:usingBlock:] + 521
13 UIKit 0x0000000102520a7e -[UIGestureEnvironment _updateGesturesForEvent:window:] + 286
14 UIKit 0x000000010205f7ad -[UIWindow sendEvent:] + 3989
15 UIKit 0x000000010200ca33 -[UIApplication sendEvent:] + 371
16 UIKit 0x00000001027feb6d __dispatchPreprocessedEventFromEventQueue + 3248
17 UIKit 0x00000001027f7817 __handleEventQueue + 4879
18 CoreFoundation 0x0000000104582311 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
19 CoreFoundation 0x000000010456759c __CFRunLoopDoSources0 + 556
20 CoreFoundation 0x0000000104566a86 __CFRunLoopRun + 918
21 CoreFoundation 0x0000000104566494 CFRunLoopRunSpecific + 420
22 GraphicsServices 0x0000000107910a6f GSEventRunModal + 161
23 UIKit 0x0000000101feef34 UIApplicationMain + 159
24 HyundaiCapital 0x000000010132a67f main + 111
25 libdyld.dylib 0x000000010610268d start + 1
26 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Edit
1.How many subviews at most i can add into delegate of scrollview at a time?
2.I am only getting this crash if i am adding subviews more than 126?
Solution
Updating ILPDFKit worked for me.