下面的代碼時,我從歷史記錄核心數據對象登錄/請求的值返回以下錯誤:[CFNumber釋放]:消息發送到釋放的實例
-[CFNumber release]: message sent to deallocated instance 0x17ea2a90
我原先認爲存在這樣的問題別處,並具有花了無數個小時試圖調試這沒有運氣。在進一步測試之後,我已經指出崩潰從歷史核心數據對象請求某些值。任何人都可以看到任何問題,爲什麼對象值被釋放?
[[DocumentHandler sharedDocumentHandler] performWithDocument:^(UIManagedDocument *document) {
if(!self.document) {
self.document = document;
}
__block NSString *identifier = [[NSUserDefaults standardUserDefaults] objectForKey:kUserDefaultsUserIdentifier];
[self.document.managedObjectContext performBlock:^{
// Create history object
History *history = [NSEntityDescription insertNewObjectForEntityForName:@"History"
inManagedObjectContext:self.document.managedObjectContext];
history.identifier = identifier;
history.followers = [NSNumber numberWithInteger:53];
history.following = [NSNumber numberWithInteger:53];
history.newFollowers = [NSNumber numberWithInteger:53];
history.unfollowers = [NSNumber numberWithInteger:53];
history.fans = [NSNumber numberWithInteger:53];
history.mutualFriends = [NSNumber numberWithInteger:53];
history.nonFollowers = [NSNumber numberWithInteger:53];
[self.document saveToURL:self.document.fileURL forSaveOperation:UIDocumentSaveForOverwriting completionHandler:^(BOOL success) {
// Fetch previous records
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"History"];
request.predicate
= [NSPredicate predicateWithFormat:@"identifier == %@", identifier];
NSError *error = nil;
NSArray *records = [self.document.managedObjectContext executeFetchRequest:request error:&error];
[records enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"%@", [(History *)obj newFollowers]); // Crash takes place here
}];
}];
}];
}];
多個日誌有異常斷點啓用:
(lldb) bt
* thread #1: tid = 0x28b70, 0x3b5787fa libobjc.A.dylib`objc_release + 10, queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x10)
frame #0: 0x3b5787fa libobjc.A.dylib`objc_release + 10
frame #1: 0x3b578022 libobjc.A.dylib`(anonymous namespace)::AutoreleasePoolPage::pop(void*) + 358
frame #2: 0x311b4298 CoreFoundation`_CFAutoreleasePoolPop + 16
frame #3: 0x3127533e CoreFoundation`__NSArrayEnumerate + 614
frame #4: 0x31216012 CoreFoundation`-[NSArray enumerateObjectsWithOptions:usingBlock:] + 62
frame #5: 0x000eae26 Twitter Followers`__71-[MainViewController updateCurrentRecordAndTableHeaderForUpdateAction:]_block_invoke_2(.block_descriptor=0x15e58080, success='\x01') + 678 at MainViewController.m:671
frame #6: 0x3ba65bea libdispatch.dylib`_dispatch_barrier_sync_f_slow_invoke + 66
frame #7: 0x3ba600ee libdispatch.dylib`_dispatch_client_callout + 22
frame #8: 0x3ba629a8 libdispatch.dylib`_dispatch_main_queue_callback_4CF + 268
frame #9: 0x3124b5b8 CoreFoundation`__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
frame #10: 0x31249e84 CoreFoundation`__CFRunLoopRun + 1308
frame #11: 0x311b4540 CoreFoundation`CFRunLoopRunSpecific + 524
frame #12: 0x311b4322 CoreFoundation`CFRunLoopRunInMode + 106
frame #13: 0x35eeb2ea GraphicsServices`GSEventRunModal + 138
frame #14: 0x33a6b1e4 UIKit`UIApplicationMain + 1136
在哪一行究竟異常發生的?你能提供一個堆棧回溯? –
它發生在[記錄enumerateObjectsUsingBlock ...]期間。我剛剛添加了更多日誌。這些日誌有一個異常斷點。 – morcutt
我也遇到了這個錯誤,但顯然是出於不同的原因(沒有以「new」開頭的屬性)。是否有可能使用它的地址獲得關於釋放對象的更多信息? – Symmetric