我创建了一个获取来获取一些朋友（'friend_id'是Friend实体的属性）：
NSPredicate* perdicate = [NSPredicate predicateWithFormat:@"friend_id IN %@", aryFriendIds];
有时它会崩溃 - 一直发生到现在。
Thread 11:
0 libsystem_kernel.dylib 0x313bc848 __kill + 8
1 Messenger 0x00026fcc -[CrashInfoReporter fatalSignal:Handler_Impl:With:] (CrashInfoReporter.m:575)
2 Messenger 0x000250aa fatal_sig_handler (CrashInfoReporter.m:401)
3 libsystem_c.dylib 0x33ac47e6 _sigtramp + 42
4 CoreFoundation 0x3714fbe8 CFEqual + 100
5 CoreFoundation 0x3715b01e -[__NSCFString isEqual:] + 210
6 CoreFoundation 0x37165318 -[NSArray containsObject:] + 164
7 Foundation 0x37aba56a -[NSInPredicateOperator performPrimitiveOperationUsingObject:andObject:] + 358
8 CoreData 0x369e1b36 -[NSMemoryStoreInPredicateOperator performPrimitiveOperationUsingObject:andObject:] + 942
9 Foundation 0x37a1a57e -[NSPredicateOperator performOperationUsingObject:andObject:] + 94
10 Foundation 0x37a19be6 -[NSComparisonPredicate evaluateWithObject:substitutionVariables:] + 246
11 Foundation 0x37a197bc -[NSPredicate evaluateWithObject:] + 16
12 CoreData 0x36959284 -[NSManagedObjectContext executeFetchRequest:error:] + 2232
我无法弄清楚问题，因为我无法重现它，但崩溃线是4 CoreFoundation 0x3714fbe8 CFEqual + 100，我想问题可能是字符串比较。
感谢您的任何提示。
我尝试将NSNumber or NSArray object添加到aryFriendIds中以让CFEqual进行比较，但效果很好。