EKEventStore导致SpringBoard崩溃

Question

我构建了一个应用程序，可以从日历(由EKEventStore predicateForEventsWithStartDate:endDate:calendars:)获取ekevents，并将应用程序事件与日历同步(使用EKEventStore saveEvent:span:commit:error:)。

我使用对EKEventStore的静态引用，并确保不同的进程不会同时访问EKEventStore。

该应用程序有时会因IOS7上的Springboard崩溃而终止。这是崩溃的回溯。

Last Exception Backtrace:
0   CoreFoundation                  0x18625e950 __exceptionPreprocess + 132
1   libobjc.A.dylib                 0x1927641fc objc_exception_throw + 60
2   CoreFoundation                  0x18625e810 +[NSException raise:format:arguments:] +     116
3   Foundation                      0x186d96db4 -[NSAssertionHandler     handleFailureInMethod:object:file:lineNumber:description:] + 112
4   EventKit                        0x186adab84 -[EKEventStore _addFetchedObjectWithID:] + 240
5   EventKit                        0x186adaa64 __78-[EKEventStore registerFetchedObjectWithID:withDefaultLoadedProperties:inSet:]_block_invoke + 96
6   libdispatch.dylib               0x192d3bfd4 _dispatch_client_callout + 16
7   libdispatch.dylib               0x192d41c84 _dispatch_barrier_sync_f_invoke + 48
8   EventKit                        0x186ada990 -[EKEventStore     registerFetchedObjectWithID:withDefaultLoadedProperties:inSet:] + 148
9   EventKit                        0x186ae1458 __41-[EKPredicateSearch startWithCompletion:]_block_invoke + 796
10  EventKit                        0x186ae1050 -[EKDaemonConnection _processReplyWithID:data:finished:] + 220
11  EventKit                        0x186ae0f5c CADReceiveReply + 136
12  EventKit                        0x186ae0eac _XReply + 124
13  EventKit                        0x186ae0e04 ClientCallbacks_server + 100
14  libdispatch.dylib               0x192d3fae8 dispatch_mig_server + 352
15  EventKit                        0x186ae0d6c __43-[EKDaemonConnection initWithOptions:path:]_block_invoke16 + 44
16  libdispatch.dylib               0x192d3bfd4 _dispatch_client_callout + 16
17  libdispatch.dylib               0x192d3db90 _dispatch_source_invoke + 500
18  libdispatch.dylib               0x192d430f4 _dispatch_root_queue_drain + 104
19  libdispatch.dylib               0x192d434fc _dispatch_worker_thread2 + 76
20  libsystem_pthread.dylib         0x192ed16bc _pthread_wqthread + 356
21  libsystem_pthread.dylib         0x192ed154c start_wqthread + 4

以下是初始化我的ekeventstore的代码：

+ (EKEventStore *) sharedStore {
     static EKEventStore *sharedEventStore;

    if (sharedEventStore == nil) {
        sharedEventStore = [[EKEventStore alloc] init];
        [sharedEventStore requestAccessToEntityType: EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {
        }];
        [sharedEventStore reset];
    }

    return sharedEventStore;
}

获取事件的代码：

NSPredicate *predicate = [[CalendarHelper sharedStore] predicateForEventsWithStartDate:startDate
                                                        endDate:endDate
                                                      calendars:[[showableCalendars copy] autorelease]];
NSArray *result = [[CalendarHelper sharedStore] eventsMatchingPredicate:predicate];

以及更新/创建事件：

EKEvent *event = [[CalendarHelper sharedStore] eventWithIdentifier:eventId];
if(event != nil) {
    event.title = title;
    event.startDate = startDate;
    event.endDate = endDate;
    NSLog(@"Updating...");
    NSLog(@"+++ %@", event.eventIdentifier);

    [[CalendarHelper sharedStore] saveEvent:event span:EKSpanThisEvent commit:commit error:nil];
    NSLog(@"Updated.");
}
else {
    NSLog(@"No event, no update");
}

有什么线索吗？

Answer 1

请检查您的ios版本。我在使用iOS 7.0.2时遇到了类似的崩溃，如果不是试试下面的代码

这个bug的原因似乎与我们试图在我们的应用程序中获取多少事件有关。查看苹果的错误报告(15424747)。

这个bug似乎是在我们的应用程序在eventStore上使用大范围的日期时引入的。

代码如下：

NSPredicate *predicate = [self.eventStore predicateForEventsWithStartDate:startDate     endDate:endDate calendars:nil]; 

//我们使用NSSortDescriptor进行排序

if (!self.masterListSortDescriptor)
{    
    self.masterListSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"startDate"  ascending:YES]; 
}

NSArray *result = [[self.eventStore eventsMatchingPredicate:predicate]
sortedArrayUsingDescriptors:@[self.masterListSortDescriptor]];