ios - 如何调试和重现 `NSOperationQueue`崩溃

Question

在我的基于日历的应用程序中，我面临着来自应用程序商店构建的大量崩溃。但是，我无法重现，也没有遇到开发过程中的崩溃。

来自 Fabric 的崩溃日志:

-[EKEventStore(Utils) calendarByRetrievingSafelyWithIdentifier:forEntityType:]

    Crashed: NSOperationQueue 0x17403fd60 :: NSOperation 0x17425bfc0 (QOS: DEFAULT)
0  CoreFoundation                 0x19179b5d8 -[__NSDictionaryM setObject:forKey:] + 476
1  EventKit                       0x19ab2a0d8 -[EKObject relationForKey:] + 216
2  EventKit                       0x19ab859d4 -[EKCalendar source] + 24
3  EventKit                       0x19ab9d718 -[EKEventStore calendarsForEntityType:] + 512
4  SampleApp                       0x100112554 -[EKEventStore(Utils) calendarByRetrievingSafelyWithIdentifier:forEntityType:] (MySampleCalendarStore.m:4767)
5  SampleApp                       0x1001d3f88 -[MyCalendarDataStore syncCalendarItems:startDate:endDate:completion:] (MyCalendarDataStore.m:84)
6  SampleApp                       0x1000f4e58 __62-[MySampleAppStore syncDeviceCalendarsAndItems:withCompletion:]_block_invoke.1043 (MySampleCalendarStore.m:2499)
7  Foundation                     0x19237e754 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
8  Foundation                     0x1922c32c8 -[NSBlockOperation main] + 96
9  Foundation                     0x1922b38c4 -[__NSOperationInternal _start:] + 620
10 Foundation                     0x192380b00 __NSOQSchedule_f + 228
11 libdispatch.dylib              0x1907451c0 _dispatch_client_callout + 16
12 libdispatch.dylib              0x190753444 _dispatch_queue_serial_drain + 928
13 libdispatch.dylib              0x1907489a8 _dispatch_queue_invoke + 652
14 libdispatch.dylib              0x19075538c _dispatch_root_queue_drain + 572
15 libdispatch.dylib              0x1907550ec _dispatch_worker_thread3 + 124
16 libsystem_pthread.dylib        0x19094e2b8 _pthread_wqthread + 1288
17 libsystem_pthread.dylib        0x19094dda4 start_wqthread + 4

我想解决这个崩溃问题，我上周在所有论坛上都尝试过。我找不到任何有用的线索来解决我的问题。请指导我手动重现此类崩溃并帮助解决。

我的代码:

NSOperationQueue *calendarDataStoresQueue = [[NSOperationQueue alloc] init];
for (EKCalendar *calendar in calendars) {
        [calendarDataStoresQueue addOperationWithBlock:^{
            MyCalendarDataStore *calendarDataStore = [[MyCalendarDataStore alloc] initWithCalendar:[[MYCalendar alloc] initWithInfoOfEventKitCalendar:calendar] eventStore:weakSelf.eventStore];
            [calendarDataStore syncCalendarItems:items startDate:syncFrom endDate:syncTo completion:^{
                complition()
            }];
        }];
}

我的实用工具:

@implementation EKEventStore (Utils)

- (EKCalendar*)calendarByRetrievingSafelyWithIdentifier:(NSString *)identifier forEntityType:(EKEntityType)entityType {
    EKCalendar *calendar;
    NSArray *calendars = [self calendarsForEntityType:entityType];
    for (EKCalendar *aCalendar in calendars) {
        if([aCalendar.calendarIdentifier isEqualToString:identifier]) {
            calendar = aCalendar;
            break;
        }

    }
    return calendar;
}
@end

提前致谢

Answer 1

您没有发布足够的信息；你在 -[EKObject relationForKey:] 方法内的某个地方发生了崩溃；更重要的是，您还没有发布崩溃的确切原因；

在我看来，这个方法 [EKObject relationForKey:] 在某个地方从自身生成 dict，并且可能是 [__NSDictionaryM setObject:forKey:] 在这里你尝试将 nil 插入 dict