iphone - Using UIAppearance with a subclass of UIBarButtonItem is causing unrecognized selector being sent to UINavigationButton -
tl&dr;
setting custom property of subclass of uibarbuttonitem using uiappearance proxy causing "unrecognized selector" exception, beause setter being forwarded uiappearance uinavigationbutton, not bar button itself.
sdk overview
i using ios 7 beta 5 sdk xcode 5 dp5. please, don't tell me under nda, because not discuss new features or new classes in question. inform of sdk, because can found out it's bug in beta software.
what did
i subclassed uibarbuttonitem , created custom property in header file:
@property (nonatomic, strong) nsstring *mysubclassedproperty ui_appearance_selector; my setter , getter this:
- (void)setmysubclassedproperty:(nsstring *)mysubclassedproperty { _mysubclassedproperty = mysubclassedproperty; nslog(@"%p %s %@", self, __pretty_function__, mysubclassedproperty); } nothing special, huh? doesn't work uiappearance @ all. when try set default appearance in application's delegate, gives me no error, no warning, whatsoever.
[[akbarbuttonitem appearance] setmysubclassedproperty:@"globally assigned"]; the crash
it seems working charm, except of fact crashes when try set instance of akbarbuttonitem self.navigationitem.rightbarbuttonitem:
self.navigationitem.rightbarbuttonitem = [[akbarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemaction target:nil action:nil]; the backtrace looks this:
2013-08-13 14:30:08.551 uibarbuttonitem subclass demo[1512:a0b] -[uinavigationbutton setmysubclassedproperty:]: unrecognized selector sent instance 0x8c42710 2013-08-13 14:30:08.556 uibarbuttonitem subclass demo[1512:a0b] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[uinavigationbutton setmysubclassedproperty:]: unrecognized selector sent instance 0x8c42710' *** first throw call stack: ( 0 corefoundation 0x0173b6f4 __exceptionpreprocess + 180 1 libobjc.a.dylib 0x014bb8b6 objc_exception_throw + 44 2 corefoundation 0x017d8983 -[nsobject(nsobject) doesnotrecognizeselector:] + 275 3 corefoundation 0x0172ba1b ___forwarding___ + 1019 4 corefoundation 0x0172b5fe _cf_forwarding_prep_0 + 14 5 corefoundation 0x0172fe2d __invoking___ + 29 6 corefoundation 0x0172fd3a -[nsinvocation invoke] + 362 7 corefoundation 0x0172feba -[nsinvocation invokewithtarget:] + 74 8 uikit 0x00763255 workaround10030904invokewithtarget + 824 9 uikit 0x0075dea8 +[_uiappearance _applyinvocationsto:window:matchingselector:] + 4497 10 uikit 0x0075e299 +[_uiappearance _applyinvocationsto:window:] + 55 11 uikit 0x0029ddcb -[uiview(calayerdelegate) layoutsublayersoflayer:] + 183 12 libobjc.a.dylib 0x014cd81f -[nsobject performselector:withobject:] + 70 13 quartzcore 0x03ac172a -[calayer layoutsublayers] + 148 14 quartzcore 0x03ab5514 _zn2ca5layer16layout_if_neededepns_11transactione + 380 15 quartzcore 0x03ac3b55 -[calayer(calayerprivate) layoutbelowifneeded] + 43 16 uikit 0x00290886 -[uiview(hierarchy) layoutbelowifneeded] + 595 17 uikit 0x0029062d -[uiview(hierarchy) layoutifneeded] + 74 18 uikit 0x0050841e -[uibarbuttonitem(uistatic) _leftrightimagepaddingforedgemargininnavbarismini:] + 574 19 uikit 0x002ea325 -[uinavigationbar _gettitleviewframe:leftviewframes:rightviewframes:foritematindex:returnedidealwidthoftextcontent:availablelayoutwidthfortextcontent:idealbackbuttonwidth:] + 3522 20 uikit 0x002ef2da -[uinavigationbar _gettitleviewframe:leftviewframes:rightviewframes:foritematindex:] + 591 21 uikit 0x002ef59a -[uinavigationbar _gettitleviewframe:leftviewframes:rightviewframes:] + 151 22 uikit 0x002dc515 -[uinavigationbar _setleftviews:rightviews:] + 1894 23 uikit 0x002ca6c5 -[uinavigationitem updatenavigationbarbuttonsanimated:] + 188 24 uikit 0x002cab63 -[uinavigationitem setobject:forleftrightkeypath:animated:] + 547 25 uikit 0x002cb1ae -[uinavigationitem setrightbarbuttonitem:animated:] + 171 26 uikit 0x002cb0fe -[uinavigationitem setrightbarbuttonitem:] + 48 27 uibarbuttonitem subclass demo 0x0000665e -[akviewcontroller viewdidload] + 222 28 uikit 0x00345c18 -[uiviewcontroller loadviewifrequired] + 696 29 uikit 0x00345eb4 -[uiviewcontroller view] + 35 30 uikit 0x00370369 -[uinavigationcontroller rotatingsnapshotviewforwindow:] + 52 31 uikit 0x00698e10 -[uiclientrotationcontext initwithclient:toorientation:duration:andwindow:] + 420 32 uikit 0x00276ff2 -[uiwindow _setrotatableclient:toorientation:updatestatusbar:duration:force:isrotating:] + 1495 33 uikit 0x00276a16 -[uiwindow _setrotatableclient:toorientation:updatestatusbar:duration:force:] + 82 34 uikit 0x002768e8 -[uiwindow _setrotatablevieworientation:updatestatusbar:duration:force:] + 117 35 uikit 0x00276970 -[uiwindow _setrotatablevieworientation:duration:force:] + 67 36 uikit 0x00275a0a __57-[uiwindow _updatetointerfaceorientation:duration:force:]_block_invoke + 120 37 uikit 0x0027596c -[uiwindow _updatetointerfaceorientation:duration:force:] + 400 38 uikit 0x002766c3 -[uiwindow setautorotates:forceupdateinterfaceorientation:] + 870 39 uikit 0x00279c7e -[uiwindow setdelegate:] + 449 40 uikit 0x0034a037 -[uiviewcontroller _trybecomerootviewcontrollerinwindow:] + 180 41 uikit 0x0026f91c -[uiwindow addrootviewcontrollerviewifpossible] + 609 42 uikit 0x00270146 -[uiwindow setrootviewcontroller:] + 960 43 uibarbuttonitem subclass demo 0x00006a07 -[akappdelegate application:didfinishlaunchingwithoptions:] + 823 44 uikit 0x0022d525 -[uiapplication _handledelegatecallbackswithoptions:issuspended:restorestate:] + 309 45 uikit 0x0022dd65 -[uiapplication _callinitializationdelegatesforurl:payload:suspended:] + 1536 46 uikit 0x00232578 -[uiapplication _runwithurl:payload:launchorientation:statusbarstyle:statusbarhidden:] + 824 47 uikit 0x0024657c -[uiapplication handleevent:withnewevent:] + 3447 48 uikit 0x00246ae9 -[uiapplication sendevent:] + 85 49 uikit 0x002341f5 _uiapplicationhandleevent + 736 50 graphicsservices 0x0365a33b _purpleeventcallback + 776 51 graphicsservices 0x03659e46 purpleeventcallback + 46 52 corefoundation 0x016b6e95 __cfrunloop_is_calling_out_to_a_source1_perform_function__ + 53 53 corefoundation 0x016b6bcb __cfrunloopdosource1 + 523 54 corefoundation 0x016e18ac __cfrunlooprun + 2156 55 corefoundation 0x016e0bf3 cfrunlooprunspecific + 467 56 corefoundation 0x016e0a0b cfrunloopruninmode + 123 57 uikit 0x00231cad -[uiapplication _run] + 840 58 uikit 0x00233f0b uiapplicationmain + 1225 59 uibarbuttonitem subclass demo 0x00006e9d main + 141 60 libdyld.dylib 0x01d77725 start + 0 ) libc++abi.dylib: terminating uncaught exception of type nsexception after examination strangly realized setmysubclassedproperty: message sent uinavigationbutton (which private subclass of uibutton used in navigation bars, toolbars , search bars). set button in frame 26 , uiappearance magic executed in frame 10.
in ios 6, issue exists different message sent uinavigationbutton:
2013-08-13 14:35:58.316 uibarbuttonitem subclass demo[1591:c07] -[uinavigationbutton _uiappearance_setmysubclassedproperty:]: unrecognized selector sent instance 0x810d600 2013-08-13 14:35:58.359 uibarbuttonitem subclass demo[1591:c07] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[uinavigationbutton _uiappearance_setmysubclassedproperty:]: unrecognized selector sent instance 0x810d600' *** first throw call stack: (0x12b2012 0x10d7e7e 0x133d4bd 0x12a1bbc 0x12a194e 0x12a61bd 0x12a60d6 0x12a624a 0x68b9e8 0x68769c 0x687a95 0x291884 0x3088ca 0x28cf96 0x2934a4 0x28b89d 0x2cc646 0x2bc076 0x2bc517 0x2bcb66 0x2bcab6 0x665e 0x3261c7 0x326232 0x3264da 0x33d8e5 0x33d9cb 0x33dc76 0x33dd71 0x33e89b 0x33e9b9 0x33ea45 0x44420b 0x2952dd 0x10eb6b0 0x289dfc0 0x289233c 0x289deaf 0x3342bd 0x27cb56 0x27b66f 0x27b589 0x27a7e4 0x27a61e 0x27b3d9 0x27e2d2 0x32899c 0x275574 0x275cc1 0x6a07 0x242157 0x242747 0x24394b 0x254cb5 0x255beb 0x247698 0x24b8df9 0x24b8ad0 0x1227bf5 0x1227962 0x1258bb6 0x1257f44 0x1257e1b 0x24317a 0x244ffc 0x6e9d 0x1ab0725) libc++abi.dylib: terminate called throwing exception deduction
my first thought was: "uiappearance forwards setter akbarbuttonitem , crashes". it? in an article peter steinberger found out apple using special subclass of _uiappearance bar items called _uibaritemappearance. wanted confirm , set symbolic breakpoint on -[_uibaritemappearance forwardinvocation:] , lldb halted before exception occurred.
now seems me apple doing dirty logic in -[_uibaritemappearance forwardinvocation:] realize selector should sent instance, like:
setbackgroundimage:forstate:should sentuinavigationbuttonsetbackbuttonbackgroundimage:forstate:barmetrics:uibarbuttonitem- ...
and code looks this:
if (selector == @selector(setbackbuttonbackgroundimage:forstate:barmetrics:)) { // forward uibarbuttonitem } else if (selector == @selector(setbackbuttonbackgroundverticalpositionadjustment:forbarmetrics:)) { // forward uibarbuttonitem } else if (...) { // more forwarding uibarbuttonitem } else { // forward uinavigationbutton } then, according deduction, last else statement causing setnicebarbuttonitemattributes: selector being sent uinavigationbutton, not uibarbuttonitem. if it's true, we're doomed.
sample code
you can download sample project here: http://cl.ly/241i2a3u0a0y.
help
am doing wrong, or bug? or maybe apple did on purpose? appreciated.
the problem uibarbuttonitem not subclass of uiview, "controller" class creates private uiview subclasses. bar button items, there private appearance proxy used, instead of usual 1 (some information here).
may suggest going different route? need subclass bar button items customization? not create subclass of uinavigationbar , use trigger changes appearancewhencontainedin:?
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