我在后台线程上调用此代码。
backgroundContext.performAndWait {
let fetchRequest:NSFetchRequest<BlogPost> = BlogPost.fetchRequest()
fetchRequest.predicate = NSPredicate.init(format: "postid=%@", argumentArray: [someInt64Value]) // this line creates an exception
_ = try? fetchRequest.execute()
....
}
如果我删除谓词，它可以正常工作。 如果在fetchResultController中使用，则相同的谓词可以正常工作。 postid是Int64，但如果我将谓词更改为任何其他键，它将给出相同的 NSInvalidArgumentException
这与Core Data Error - NSDate localizedCaseInsensitiveCompare: unrecognised selector sent to instance
非常相似2016-10-11 21:58:13.918 BlogClient[44494:13192129] -[_SwiftValue longLongValue]: unrecognized selector sent to instance 0x618000243cc0
2016-10-11 21:58:13.922 BlogClient[44494:13192129] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_SwiftValue longLongValue]: unrecognized selector sent to instance 0x618000243cc0'
*** First throw call stack:
(
0 CoreFoundation 0x000000010f59534b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010ebd921e objc_exception_throw + 48
2 CoreFoundation 0x000000010f604f34 -[NSObject(NSObject) doesNotRecognizeSelector:] + 132
3 CoreFoundation 0x000000010f51ac15 ___forwarding___ + 1013
4 CoreFoundation 0x000000010f51a798 _CF_forwarding_prep_0 + 120
5 CoreData 0x000000010f09762e -[NSSQLiteConnection execute] + 2270
6 CoreData 0x000000010f0aeaba newFetchedRowsForFetchPlan_MT + 1658
7 CoreData 0x000000010f274467 _executeFetchRequest + 55
8 CoreData 0x000000010f1f3be5 -[NSSQLFetchRequestContext executeRequestUsingConnection:] + 53
9 CoreData 0x000000010f220eb7 __52-[NSSQLDefaultConnectionManager handleStoreRequest:]_block_invoke + 215
10 libdispatch.dylib 0x0000000112b8b0cd _dispatch_client_callout + 8
11 libdispatch.dylib 0x0000000112b6830a _dispatch_barrier_sync_f_invoke + 340
12 CoreData 0x000000010f220d8c -[NSSQLDefaultConnectionManager handleStoreRequest:] + 236
13 CoreData 0x000000010f22861f -[NSSQLCoreDispatchManager routeStoreRequest:] + 351
14 CoreData 0x000000010f1ab7d9 -[NSSQLCore dispatchRequest:withRetries:] + 233
15 CoreData 0x000000010f1a711d -[NSSQLCore processFetchRequest:inContext:] + 93
16 CoreData 0x000000010f09dcf8 -[NSSQLCore executeRequest:withContext:error:] + 568
17 CoreData 0x000000010f191b79 __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke + 5609
18 CoreData 0x000000010f189966 -[NSPersistentStoreCoordinator _routeHeavyweightBlock:] + 390
19 CoreData 0x000000010f09d87e -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 654
20 CoreData 0x000000010f09be24 -[NSManagedObjectContext executeFetchRequest:error:] + 548
21 CoreData 0x000000010f0e154f -[NSManagedObjectContext(_NestedContextSupport) _parentObjectsForFetchRequest:inContext:error:] + 431
22 CoreData 0x000000010f1626b3 __82-[NSManagedObjectContext(_NestedContextSupport) executeRequest:withContext:error:]_block_invoke + 611
23 CoreData 0x000000010f0e133d internalBlockToNSManagedObjectContextPerform + 93
24 libdispatch.dylib 0x0000000112b8b0cd _dispatch_client_callout + 8
25 libdispatch.dylib 0x0000000112b6d5e5 _dispatch_barrier_sync_f_slow_invoke + 617
26 libdispatch.dylib 0x0000000112b8b0cd _dispatch_client_callout + 8
27 libdispatch.dylib 0x0000000112b6b8d6 _dispatch_main_queue_callback_4CF + 406
28 CoreFoundation 0x000000010f5594f9 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
29 CoreFoundation 0x000000010f51ef8d __CFRunLoopRun + 2205
30 CoreFoundation 0x000000010f51e494 CFRunLoopRunSpecific + 420
31 GraphicsServices 0x0000000113b72a6f GSEventRunModal + 161
32 UIKit 0x000000010f9b8f34 UIApplicationMain + 159
33 BlogClient 0x000000010e5a8bdf main + 111
34 libdyld.dylib 0x0000000112bd768d start + 1
35 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
答案 0 :(得分：0)
我发现了这个问题。传递Int64会混淆argumentArray，将其转换为Int可以解决问题。
这似乎是作为雷达28749194提交的NSPredicate（）中的一个错误
let id:Int64 = 5785905063264256 // Making this Int works
@objc class Test:NSObject {
let postid = id
}
let predicate = NSPredicate(format: "postid == %@"
, argumentArray: [id])
let mytest = Test()
predicate.evaluate(with: mytest) //false but should be true