EXC_BAD_ACCESS与NSFetchedResultsController [英] EXC_BAD_ACCESS with NSFetchedResultsController
问题描述
尝试跟踪此错误我得到当我有 NSZombieEnabled 。
我得到一个EXC_BAD_ACCESS抓取结果控制器尝试执行抓取。
调试器说：
- [CFNumber retain]：消息发送到释放的实例0x6e88d10
Backtrace说：
＃0 0x014bbe1e in ___forwarding___（）
＃1 0x014bbce2在__forwarding_prep_0___（）
＃2 0x0145c490在CFRetain $ b＃3 0x0147929a in CFNumberCreate（）
＃4 0x00b221ed in - [NSPlaceholderNumber initWithShort：]（）
＃5 0x00b2216a in + [NSNumber numberWithShort：]（）
＃6 0x010a549e in snapshot_get_value_as_object （）
＃7 0x010a2a41 in _sharedIMPL_pvfk_core（）
＃8 0x010a707d in - [NSManagedObject（_PFDynamicAccessorsAndPropertySupport）_genericValueForKey：withIndex：flags：]（）
＃9 0x010df6f0 in _PF_Handler_Public_GetProperty b＃10 0x010df61d in - [NSManagedObject valueForKey：]（）
＃11 0x00aea8d5 in - [NSObject（NSKeyValueCoding）valueForKeyPath：]（）
＃12 0x00b1ad5e in _NSSortFunctionMany（）
＃13 0x0152bf3f在__CFMergeSortArray_block_invoke_0（）
＃14 0x014b19d3在__CFSimpleMergeSort（）
＃15 0x014b1969在__CFSimpleMergeSort（）
＃16 0x014b1969在__CFSimpleMergeSort（）
＃17 0x014b1828在CFSortIndexes $ b＃18 0x014eb7e9 in CFMergeSortArray（）
＃19 0x00b1828e in _sortedObjectsUsingDescriptors（）
＃20 0x00b17fd9 in - [NSArray（NSKeyValueSorting）sortedArrayUsingDescriptors：]（）
＃21 0x010853c6 in - [NSManagedObjectContext / user / david中的 - [RootViewController fetchedResultsController]（self = 0x6d4bc80，_cmd = 0x15a28）中执行executeFetchRequest：error：]（）
＃22 0x0118fc8f - [NSFetchedResultsController performFetch：]（）
＃23 0x000105c0 /Dropbox/Xcode/MyApp/MyApp/RootViewController.m:513
＃24 0x0000e549 - [RootViewController reloadTableView]（self = 0x6d4bc80，_cmd = 0x158d6）在/ Users / david / Dropbox / Xcode / MyApp / MyApp / RootViewController.m：159
＃25 0x01556ec9 in - [NSObject performSelector：withObject：withObject：]（）
＃26 0x001dc5c2 in - [UIApplication sendAction：to：from：forEvent：] b＃27 0x001dc55a in - [UIApplication sendAction：toTarget：fromSender：forEvent：]（）
＃28 0x00281b76 in - [UIControl sendAction：to：forEvent：]（）
＃29 0x0028203f in - [UIControl （内部）_sendActionsForEvents：withEvent：]（）
＃30 0x00281bab - [UIControl sendActionsForControlEvents：]（）
＃31 0x002cfa99 - [UISegmentedControl _setSelectedSegmentIndex：notify：]（）
＃32 0x0020193f in - [UIWindow _sendTouchesForEvent：]（）
＃34 0x00201c56 - - [UIWindow sendEvent：]（）
＃35（0x0020193f）0x0020193f - [UISegmentedControl touchesBegan：withEvent：] 0x001e8384 in - [UIApplication sendEvent：]（）
＃36 0x001dbaa9 in _UIApplicationHandleEvent（）
＃37 0x02442fa9 in PurpleEventCallback（）
＃38 0x015291c5 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__（）
＃39 0x0148e022在__CFRunLoopDoSource1（）
＃40 0x0148c90a在__CFRunLoopRun（）
＃41 0x0148bdb4在CFRunLoopRunSpecific（）
＃42 0x0148bccb在CFRunLoopRunInMode（）
＃43 0x02441879在GSEventRunModal $ b＃44 0x0244193e在GSEventRun（）
＃45 0x001d9a9b在UIApplicationMain（）
＃46 0x000020ed在main（argc = 1，argv = 0xbffff5e8）在/ Users / david / Dropbox / Xcode / MyApp / MyApp / main.m：14
这里是NSFetchedResultsController中的相关代码：
- （NSFetchedResultsController *）fetchedResultsController
{
if（__fetchedResultsController！= nil）
{
return __fetchedResultsController;
}
NSFetchRequest * fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription * entity = [NSEntityDescription entityForName：kGestureEntity inManagedObjectContext：self.managedObjectContext];
[fetchRequest setEntity：entity];
[fetchRequest setFetchBatchSize：0];
//排序键
NSSortDescriptor * sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey：kCategory ascending：YES];
NSSortDescriptor * sortDescriptor2 = [[NSSortDescriptor alloc] initWithKey：kOrder ascending：YES]; //这是内核16在内核数据模型
NSArray * sortDescriptors = [[NSArray alloc] initWithObjects：sortDescriptor1，sortDescriptor2，nil];
[fetchRequest setSortDescriptors：sortDescriptors];
//通过制表符索引过滤男性或女性
//设置tabIndex，以便fetchedResultsController知道要过滤的性别
NSUInteger tabIndex = self.appDelegate.tabBarController.selectedIndex;
NSString * theSex = [NSString string];
if（tabIndex == 0）
theSex = vFemale;
else
theSex = vMale;
//确定坐或站立
NSInteger segmentIndex = self.segmentedControl.selectedSegmentIndex;
NSString * sittingOrStanding = [NSString string];
if（segmentIndex == 0）
sittingOrStanding = vSitting;
else
sittingOrStanding = vStanding;
NSPredicate * predicate = [NSPredicate predicateWithFormat：@％K like％@ AND（％K like％@ OR％K like％@），kSex，theSex，kSittingOrStanding，sittingOrStanding，kSittingOrStanding，vBothSittingAndStanding ];
[fetchRequest setPredicate：predicate];
NSFetchedResultsController * aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest：fetchRequest managedObjectContext：self.managedObjectContext sectionNameKeyPath：kCategory cacheName：nil];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
NSError * error = nil;
if（！[self.fetchedResultsController performFetch：& error]）//这是WHERE EXC_BAD_ACCESS HAPPENS
{
NSLog（@未解决的错误％@，％@ error userInfo]）;
}
[aFetchedResultsController release];
[fetchRequest release];
[sortDescriptor1 release];
[sortDescriptor2 release];
[sortDescriptors release];
return __fetchedResultsController;
}
只有我能看到的是 kOrder 属性设置为Int 16.但是，我不确定是什么是过早发布这个 CFNumber 通过私人方法保留。非常感谢任何帮助。
Edit1：头文件：
@property（nonatomic，retain）NSFetchedResultsController * fetchedResultsController;
然后在实现中：
@synthesize fetchedResultsController = __ fetchedResultsController;
Edit2：为了清楚起见，我的应用程序在iOS 4上运行良好，只有iOS 5崩溃。 p>
设置 NSZombieEnabled ， MallocStackLogging 和 guard malloc 。然后，当你的应用程序崩溃，在gdb控制台中输入：
（gdb）info malloc-history 0x6e88d10
使用 Trying to track down this error I get when I have I get an EXC_BAD_ACCESS when the fetched results controllers attempts to execute a fetch. Debugger says: Backtrace says: Here's the pertinent code in NSFetchedResultsController: Only thing I can figure is the Edit1: Header file: Then in the implementation: Edit2: For clarity, my app worked fine with iOS 4 and only crashes with iOS 5. Set NSZombieEnabled, MallocStackLogging, and guard malloc in the debugger. Then, when your App crashes, type this in the gdb console: Replace See this article for more detailed instructions. 这篇关于EXC_BAD_ACCESS与NSFetchedResultsController的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
NSZombieEnabled.-[CFNumber retain]: message sent to deallocated instance 0x6e88d10
#0 0x014bbe1e in ___forwarding___ ()
#1 0x014bbce2 in __forwarding_prep_0___ ()
#2 0x0145c490 in CFRetain ()
#3 0x0147929a in CFNumberCreate ()
#4 0x00b221ed in -[NSPlaceholderNumber initWithShort:] ()
#5 0x00b2216a in +[NSNumber numberWithShort:] ()
#6 0x010a549e in snapshot_get_value_as_object ()
#7 0x010a2a41 in _sharedIMPL_pvfk_core ()
#8 0x010a707d in -[NSManagedObject(_PFDynamicAccessorsAndPropertySupport) _genericValueForKey:withIndex:flags:] ()
#9 0x010df6f0 in _PF_Handler_Public_GetProperty ()
#10 0x010df61d in -[NSManagedObject valueForKey:] ()
#11 0x00aea8d5 in -[NSObject(NSKeyValueCoding) valueForKeyPath:] ()
#12 0x00b1ad5e in _NSSortFunctionMany ()
#13 0x0152bf3f in __CFMergeSortArray_block_invoke_0 ()
#14 0x014b19d3 in __CFSimpleMergeSort ()
#15 0x014b1969 in __CFSimpleMergeSort ()
#16 0x014b1969 in __CFSimpleMergeSort ()
#17 0x014b1828 in CFSortIndexes ()
#18 0x014eb7e9 in CFMergeSortArray ()
#19 0x00b1828e in _sortedObjectsUsingDescriptors ()
#20 0x00b17fd9 in -[NSArray(NSKeyValueSorting) sortedArrayUsingDescriptors:] ()
#21 0x010853c6 in -[NSManagedObjectContext executeFetchRequest:error:] ()
#22 0x0118fc8f in -[NSFetchedResultsController performFetch:] ()
#23 0x000105c0 in -[RootViewController fetchedResultsController] (self=0x6d4bc80, _cmd=0x15a28) at /Users/david/Dropbox/Xcode/MyApp/MyApp/RootViewController.m:513
#24 0x0000e549 in -[RootViewController reloadTableView] (self=0x6d4bc80, _cmd=0x158d6) at /Users/david/Dropbox/Xcode/MyApp/MyApp/RootViewController.m:159
#25 0x01556ec9 in -[NSObject performSelector:withObject:withObject:] ()
#26 0x001dc5c2 in -[UIApplication sendAction:to:from:forEvent:] ()
#27 0x001dc55a in -[UIApplication sendAction:toTarget:fromSender:forEvent:] ()
#28 0x00281b76 in -[UIControl sendAction:to:forEvent:] ()
#29 0x0028203f in -[UIControl(Internal) _sendActionsForEvents:withEvent:] ()
#30 0x00281bab in -[UIControl sendActionsForControlEvents:] ()
#31 0x002cfa99 in -[UISegmentedControl _setSelectedSegmentIndex:notify:] ()
#32 0x002d1407 in -[UISegmentedControl touchesBegan:withEvent:] ()
#33 0x0020193f in -[UIWindow _sendTouchesForEvent:] ()
#34 0x00201c56 in -[UIWindow sendEvent:] ()
#35 0x001e8384 in -[UIApplication sendEvent:] ()
#36 0x001dbaa9 in _UIApplicationHandleEvent ()
#37 0x02442fa9 in PurpleEventCallback ()
#38 0x015291c5 in __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ ()
#39 0x0148e022 in __CFRunLoopDoSource1 ()
#40 0x0148c90a in __CFRunLoopRun ()
#41 0x0148bdb4 in CFRunLoopRunSpecific ()
#42 0x0148bccb in CFRunLoopRunInMode ()
#43 0x02441879 in GSEventRunModal ()
#44 0x0244193e in GSEventRun ()
#45 0x001d9a9b in UIApplicationMain ()
#46 0x000020ed in main (argc=1, argv=0xbffff5e8) at /Users/david/Dropbox/Xcode/MyApp/MyApp/main.m:14
- (NSFetchedResultsController *)fetchedResultsController
{
if (__fetchedResultsController != nil)
{
return __fetchedResultsController;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:kGestureEntity inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
[fetchRequest setFetchBatchSize:0];
// sort keys
NSSortDescriptor *sortDescriptor1 = [[NSSortDescriptor alloc] initWithKey:kCategory ascending:YES];
NSSortDescriptor *sortDescriptor2 = [[NSSortDescriptor alloc] initWithKey:kOrder ascending:YES]; // THIS IS AN INT 16 IN THE CORE DATA MODEL
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor1, sortDescriptor2, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
//filter for males or females by tab index
//set the tabIndex so the fetchedResultsController knows which sex to filter
NSUInteger tabIndex = self.appDelegate.tabBarController.selectedIndex;
NSString *theSex = [NSString string];
if (tabIndex == 0)
theSex = vFemale;
else
theSex = vMale;
//determine if sitting or standing
NSInteger segmentIndex = self.segmentedControl.selectedSegmentIndex;
NSString *sittingOrStanding = [NSString string];
if (segmentIndex == 0)
sittingOrStanding = vSitting;
else
sittingOrStanding = vStanding;
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"%K like %@ AND (%K like %@ OR %K like %@)", kSex, theSex, kSittingOrStanding, sittingOrStanding, kSittingOrStanding, vBothSittingAndStanding];
[fetchRequest setPredicate:predicate];
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:kCategory cacheName:nil];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error]) //THIS IS WHERE EXC_BAD_ACCESS HAPPENS
{
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
}
[aFetchedResultsController release];
[fetchRequest release];
[sortDescriptor1 release];
[sortDescriptor2 release];
[sortDescriptors release];
return __fetchedResultsController;
}
kOrder property in my core data model is set to an Int 16. But, I'm not sure what's prematurely releasing this CFNumber which appears to be retained via private methods. Any help is greatly appreciated.@property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController;
@synthesize fetchedResultsController=__fetchedResultsController;
(gdb) info malloc-history 0x6e88d10
0x6e88d10 with the address of the "message sent to deallocated instance" object that caused the crash, and you will get a much more useful stack trace and it should help you pinpoint the exact line in your code that is causing the problem.
