Open Radar

 
Summary:
I think this is a Mavericks regression.

When creating an NSCollectionView with a prototype that is simply an NSButton, inspecting accessibility on the view throws an NSException, like

2013-11-29 11:41:40.178 a.out[25520:507] -[NSButtonCell item]: unrecognized selector sent to instance 0x7fe0f2d18dd0

And the inspector reports a warning: "Parent does not report element as one of its children"

Pretty sure this worked in Mountain Lion.

Call stack is like

0x95b35eea	[CoreFoundation + 0x00169eea ]	-[NSObject(NSObject) doesNotRecognizeSelector:]
0x95a81801	[CoreFoundation + 0x000b5801 ]	___forwarding___
0x95a813ed	[CoreFoundation + 0x000b53ed ]	__forwarding_prep_0___
0x941e132f	[AppKit + 0x00a8032f ]	-[NSCollectionView(NSCollectionViewAccessibility) accessibilityIndexOfChild:]
0x93b2b3ef	[AppKit + 0x003ca3ef ]	-[NSObject(NSObjectAccessibilityAttributeAccessAdditions) accessibilityIndexForChildUIElementAttributeForParameter:]
0x97c132ae	[libobjc.A.dylib + 0x0001a2ae ]	-[NSObject performSelector:withObject:]
0x93b2b363	[AppKit + 0x003ca363 ]	-[NSObject(NSObjectAccessibilityAttributeAccessAdditions) accessibilityAttributeValue:forParameter:]
0x93b2f105	[AppKit + 0x003ce105 ]	CopyParameterizedAttributeValue
0x95901f75	[HIServices + 0x00023f75 ]	_AXXMIGCopyParameterizedAttributeValue
0x9590d233	[HIServices + 0x0002f233 ]	_XCopyParameterizedAttributeValue
0x958e4bda	[HIServices + 0x00006bda ]	mshMIGPerform
0x95a520f4	[CoreFoundation + 0x000860f4 ]	__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__
0x95a5205a	[CoreFoundation + 0x0008605a ]	__CFRunLoopDoSource1
0x95a42821	[CoreFoundation + 0x00076821 ]	__CFRunLoopRun

Steps to Reproduce:
See the attached repro case.
 1. Compile with `clang app.m -Wall -framework Cocoa`
 2. Run (./a.out)
 3. Open Accessibility Inspector and hover over the "test" button.

Expected Results:
Inspecting accessibility shouldn't throw unhandled exceptions

Actual Results:
Unhandled exception:
2013-11-29 11:41:40.178 a.out[25520:507] -[NSButtonCell item]: unrecognized selector sent to instance 0x7fe0f2d18dd0

And the inspector reports a warning: "Parent does not report element as one of its children"

Version:
Xcode Version 5.0.1 (5A2053) / System Version:	OS X 10.9 (13A603)

Notes:


Configuration:
When I compile, these are the library versions I'm currently picking up.
$ otool -L a.out
a.out:
	/System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa (compatibility version 1.0.0, current version 20.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1197.1.1)
	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 855.11.0)
	/usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)
	/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 1265.0.0)