我试图加载所有的日历事件通过使用块和有时(0.5％率)我得到NSInvalidArgumentException导致崩溃：
var allCals = _eventStore.calendarsForEntityType(EKEntityTypeEvent)
var predicate:NSPredicate! = _eventStore.predicateForEventsWithStartDate(yearsAgo,endDate:toAgo,calendars:allCals)
_eventStore.enumerateEventsMatchingPredicate(predicate,usingBlock:{
(event:EKEvent!,stop:UnsafeMutablePointer<ObjCBool>) in
if (event.title != nil
&& event.calendar != nil
&& event.calendar.calendarIdentifier != nil
&& event.lastModifiedDate != nil
){
if event.attendees != nil{ // < -- SOMETIMES LEADS TO CRASH!!
//...
}
else{ // standalone
//...
}
}
//......
})// end block
完整堆栈跟踪：[线程崩溃异常]
Thread : Fatal Exception: NSInvalidArgumentException 0 CoreFoundation 0x2917649f __exceptionPreprocess + 126 1 libobjc.A.dylib 0x36970c8b objc_exception_throw + 38 2 CoreFoundation 0x29096291 -[__NSSetM addObject:] + 608 3 EventKit 0x29b4eacf -[EKPersistentObject primitiveRelationValueForKey:] + 502 4 Foundation 0x29dc1617 -[NSObject(NSKeyValueCoding) valueForKey:] + 202 5 EventKit 0x29b5afc5 -[EKObjectToManyRelation _loadedItems] + 120 6 EventKit 0x29b5aef3 -[EKObjectToManyRelation _effectiveItems] + 102 7 EventKit 0x29b5ae69 -[EKObjectToManyRelation items] + 20 8 EventKit 0x29b5d179 -[EKCalendarItem attendees] + 36 9 MyApp 0x000d8c78 _TTSf2n_n_n_n_n_d_i_n_n___TFFC8MyApp17WmBuildGroupsTask14doInBackgroundFS0_FT_T_U_FTGSqCSo7EKEvent_GVSs20UnsafeMutablePointerV10ObjectiveC8ObjCBool__T_ (WmBuildGroupsTask.swift:421) 10 MyApp 0x000d3f3c _TPA__TTSf2n_n_n_n_n_d_i_n_n___TFFC8MyApp17WmBuildGroupsTask14doInBackgroundFS0_FT_T_U_FTGSqCSo7EKEvent_GVSs20UnsafeMutablePointerV10ObjectiveC8ObjCBool__T_ (WmBuildGroupsTask.swift) 11 MyApp 0x000d96b8 reabstraction thunk helper from @callee_owned (@owned Swift.ImplicitlyUnwrappedOptional<ObjectiveC.EKEvent>,@unowned Swift.UnsafeMutablePointer<ObjectiveC.ObjCBool>) -> (@unowned ()) to @callee_unowned @objc_block (@unowned Swift.ImplicitlyUnwrappedOptional<ObjectiveC.EKEvent>,@unowned Swift.UnsafeMutablePointer<ObjectiveC.ObjCBool>) -> (@unowned ()) (WmBuildGroupsTask.swift) 12 EventKit 0x29ba72a7 __60-[EKEventStore enumerateEventsMatchingPredicate:usingBlock:]_block_invoke + 130 13 EventKit 0x29bad6af __41-[EKPredicateSearch startWithCompletion:]_block_invoke_2 + 690 14 libdispatch.dylib 0x36ed07bb _dispatch_call_block_and_release + 10 15 libdispatch.dylib 0x36ed9dab _dispatch_root_queue_drain + 866 16 libdispatch.dylib 0x36edacd7 _dispatch_worker_thread3 + 94 17 libsystem_pthread.dylib 0x37031e31 _pthread_wqthread + 668 18 libsystem_pthread.dylib 0x37031b84 start_wqthread + 8
Thread : Crashed: com.apple.root.default-qos 0 libsystem_kernel.dylib 0x36fb6dfc __pthread_kill + 8 1 libsystem_pthread.dylib 0x37034d37 pthread_kill + 62 2 libsystem_c.dylib 0x36f56909 abort + 76 3 libc++abi.dylib 0x362919c9 __cxa_bad_cast 4 libc++abi.dylib 0x362ab671 default_unexpected_handler() 5 libobjc.A.dylib 0x36970f25 _objc_terminate() + 192 6 libc++abi.dylib 0x362a8de3 std::__terminate(void (*)()) + 78 7 libc++abi.dylib 0x362a85a9 __cxxabiv1::exception_cleanup_func(_Unwind_Reason_Code,_Unwind_Exception*) 8 libobjc.A.dylib 0x36970d5f objc_exception_throw + 250 9 CoreFoundation 0x29096291 -[__NSSetM addObject:] + 608 10 EventKit 0x29b4eacf -[EKPersistentObject primitiveRelationValueForKey:] + 502 11 Foundation 0x29dc1617 -[NSObject(NSKeyValueCoding) valueForKey:] + 202 12 EventKit 0x29b5afc5 -[EKObjectToManyRelation _loadedItems] + 120 13 EventKit 0x29b5aef3 -[EKObjectToManyRelation _effectiveItems] + 102 14 EventKit 0x29b5ae69 -[EKObjectToManyRelation items] + 20 15 EventKit 0x29b5d179 -[EKCalendarItem attendees] + 36 16 MyApp 0x000d8c78 _TTSf2n_n_n_n_n_d_i_n_n___TFFC8MyApp17WmBuildGroupsTask14doInBackgroundFS0_FT_T_U_FTGSqCSo7EKEvent_GVSs20UnsafeMutablePointerV10ObjectiveC8ObjCBool__T_ (WmBuildGroupsTask.swift:421) 17 MyApp 0x000d3f3c _TPA__TTSf2n_n_n_n_n_d_i_n_n___TFFC8MyApp17WmBuildGroupsTask14doInBackgroundFS0_FT_T_U_FTGSqCSo7EKEvent_GVSs20UnsafeMutablePointerV10ObjectiveC8ObjCBool__T_ (WmBuildGroupsTask.swift) 18 MyApp 0x000d96b8 reabstraction thunk helper from @callee_owned (@owned Swift.ImplicitlyUnwrappedOptional<ObjectiveC.EKEvent>,@unowned Swift.UnsafeMutablePointer<ObjectiveC.ObjCBool>) -> (@unowned ()) (WmBuildGroupsTask.swift) 19 EventKit 0x29ba72a7 __60-[EKEventStore enumerateEventsMatchingPredicate:usingBlock:]_block_invoke + 130 20 EventKit 0x29bad6af __41-[EKPredicateSearch startWithCompletion:]_block_invoke_2 + 690 21 libdispatch.dylib 0x36ed07bb _dispatch_call_block_and_release + 10 22 libdispatch.dylib 0x36ed9dab _dispatch_root_queue_drain + 866 23 libdispatch.dylib 0x36edacd7 _dispatch_worker_thread3 + 94 24 libsystem_pthread.dylib 0x37031e31 _pthread_wqthread + 668
第9行a.e. WmBuildGroupsTask.swift：421如果event.attendees！= nil {
任何人都可以散布如何摆脱这场崩溃，或至少使代码安全从崩溃？
[编辑1]
我也试过：
if event.hasAttendees {
if let attArray:NSArray = event.attendees{ // crashes here
/* ... */
}
}}
有趣的是，从命令行：po event.hasAttendees返回true
当po event.attendees返回null时。但还是崩溃了
[编辑2]
升级到Swift 1.2后，得到同样的崩溃(Crashlytics)。还试过：
if event.hasAttendees {
if let attArray:[EKParticipant] = event.attendees as? [EKParticipant] // crash here
{
/* ... */
}
}
有问题的事件是指像Google这样的日历，正如我上面提到的一样，99.5％的同一事件正常工作，并且我取得了与会者的成功。
我不是iOS大师，但看起来像它的内部iOS问题：
libobjc.A.dylib 0x36970d5f objc_exception_throw + 250 9 CoreFoundation 0x29096291 -[__NSSetM addObject:] + 608 10 EventKit 0x29b4eacf -[EKPersistentObject primitiveRelationValueForKey:] + 502 11 Foundation 0x29dc1617 -[NSObject(NSKeyValueCoding) valueForKey:] + 202 12 EventKit 0x29b5afc5 -[EKObjectToManyRelation _loadedItems] + 120 13 EventKit 0x29b5aef3 -[EKObjectToManyRelation _effectiveItems] + 102 14 EventKit 0x29b5ae69 -[EKObjectToManyRelation items] + 20 15 EventKit 0x29b5d179 -[EKCalendarItem attendees] + 36
谢谢，
