我正在調查在我的應用程序的Crashlytics控制檯中報告的某種程度上頻繁的崩潰。libobjc.A.dylib t objc_msg在後臺線程中發生核心數據使用的崩潰
之一許多例子我有具有以下應聲線程堆棧跟蹤:
#11. Crashed: com.apple.root.default-qos
0 libobjc.A.dylib 0x22f3fa86 objc_msgSend + 5
1 Foundation 0x23ee3005 -[NSString caseInsensitiveCompare:] + 28
2 Foundation 0x23ed10bd _NSCompareObject + 28
3 Foundation 0x23ed109d _NSSortFunctionOne + 120
4 CoreFoundation 0x2373e6a3 __CFSimpleMergeSort + 114
5 CoreFoundation 0x2373e6c5 __CFSimpleMergeSort + 148
6 CoreFoundation 0x2373e6d9 __CFSimpleMergeSort + 168
7 CoreFoundation 0x2373e6c5 __CFSimpleMergeSort + 148
8 CoreFoundation 0x2373e6d9 __CFSimpleMergeSort + 168
9 CoreFoundation 0x2368ac35 CFSortIndexes + 404
10 CoreFoundation 0x2368c241 CFMergeSortArray + 176
11 Foundation 0x23ed0a9d _sortedObjectsUsingDescriptors + 456
12 Foundation 0x23f9c9fb -[NSSet(NSKeyValueSorting) sortedArrayUsingDescriptors:] + 510
13 MyApp 0x6d431 __24-[MyApp refresh]_block_invoke (MyApp.m:247)
14 CoreFoundation 0x23769499 __NSArrayEnumerate + 372
15 CoreFoundation 0x236e6c3b -[NSArray enumerateObjectsWithOptions:usingBlock:] + 62
16 MyApp 0x6d17d -[MyApp refresh] (MyApp.m:263)
17 MyApp 0xa97eb __52-[MyAppRequest updateAfterNotification:]_block_invoke (MyAppRequest.m:1175)
18 libdispatch.dylib 0x23307cbf _dispatch_call_block_and_release + 10
19 libdispatch.dylib 0x233136a1 _dispatch_root_queue_drain + 1572
20 libdispatch.dylib 0x2331307b _dispatch_worker_thread3 + 94
21 libsystem_pthread.dylib 0x234a6e0d _pthread_wqthread + 1024
22 libsystem_pthread.dylib 0x234a69fc start_wqthread + 8
崩潰的其他實例發生在相同的應用程序代碼(在MyApp
類的refresh
方法),但在不同的部分CoreFoundation sortedArrayUsingDescriptors
方法邏輯。例如,另一個崩潰例如堆棧跟蹤有:
0 libobjc.A.dylib 0x1823cdb90 objc_msgSend + 16
1 CoreFoundation 0x182c42738 CFStringCompareWithOptionsAndLocale + 232
2 Foundation 0x183644840 _NSCompareObject + 64
3 CoreFoundation 0x182d150f4 __CFSimpleMergeSort + 196
4 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
5 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
6 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
7 CoreFoundation 0x182d1513c __CFSimpleMergeSort + 268
8 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
9 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
10 CoreFoundation 0x182d15124 __CFSimpleMergeSort + 244
11 CoreFoundation 0x182c3b738 CFSortIndexes + 472
12 CoreFoundation 0x182c3cf58 CFMergeSortArray + 220
13 Foundation 0x1836440f8 _sortedObjectsUsingDescriptors + 564
14 Foundation 0x183725120 -[NSSet(NSKeyValueSorting) sortedArrayUsingDescriptors:] + 564
15 MyApp 0x10006f264 __24-[MyApp refresh]_block_invoke (MyApp.m:247)
在刷新應用程序代碼是:
其中的getProducts是:
- (NSArray*)getProducts {
NSFetchRequest *productFetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"Products"];
// Filter
NSMutableArray *productsPredicates = [NSMutableArray array];
[productsPredicates addObject:[NSPredicate predicateWithFormat:@"life_uid == %@", req.lifeUid]];
[productsPredicates addObject:[NSPredicate predicateWithFormat:@"hidden == %@", @NO]];
[productFetchRequest setPredicate:[NSCompoundPredicate andPredicateWithSubpredicates:productsPredicates]];
// Sort
NSSortDescriptor *sortProductsByName = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
[productFetchRequest setSortDescriptors:@[sortProductsByName]];
[productFetchRequest setReturnsObjectsAsFaults:NO];
[productFetchRequest setRelationshipKeyPathsForPrefetching:@[@"subprods", @"subprods.special"]];
NSManagedObjectContext *moc = [MyAppCoreDataController sharedController].mainManagedObjectContext;
NSError *error = nil;
NSArray *products = [moc executeFetchRequest:productFetchRequest error:&error];
if (error) {
NSLog(@"Error fetching products %@", error);
}
return products;
}
,並刷新被稱爲像這樣:
- (void)updateAfterNotification:(NSNotification *)notification {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[[MyApp instance] refresh];
});
}
謝謝湯姆,我會在這方面讀一下。我在Core Data方面沒有太多的經驗,而且絕對沒有寫出我正在看的應用程序邏輯,所以這對我來說是比較新的。我會在什麼時候發表評論(如果?)我對這個東西有一個總體的瞭解! – Zach