Core data CoreData fetchRequest导致未捕获异常
在CoreData中，我希望通过键获取元素。但是，执行fetch请求会导致Core data CoreData fetchRequest导致未捕获异常,core-data,swift,ios8,Core Data,Swift,Ios8,在CoreData中，我希望通过键获取元素。但是，执行fetch请求会导致无法识别的选择器发送到实例。下面是我代码的摘录，最后一行失败了managedObjectContext是一个有效的实例，因为我也是插入新实例的那个人。这是否与Swift的Int64和CoreData的Integer 64不兼容 var error : NSError? var request = NSFetchRequest(entityName: "Node") var nodeId = NSNumber(longLon
无法识别的选择器发送到实例。下面是我代码的摘录，最后一行失败了managedObjectContext
是一个有效的实例，因为我也是插入新实例的那个人。这是否与Swift的Int64和CoreData的Integer 64不兼容
var error : NSError?
var request = NSFetchRequest(entityName: "Node")
var nodeId = NSNumber(longLong: Int64(46763376))
request.predicate = NSPredicate(format: "id = %@", [nodeId])
var nodes = managedObjectContext.executeFetchRequest(request, error: &error)
数据模型中的实体定义：
节点实体在Swift中定义为：
class Node : NSManagedObject {
@NSManaged var id: NSNumber
@NSManaged var lat: NSNumber
@NSManaged var lon: NSNumber
@NSManaged var tags: NSMutableSet
@NSManaged var ways: NSMutableSet
func description() -> String {
return "Node(id=\(id), lat=\(lat), lon=\(lon))"
}
}
堆栈跟踪：
2014-06-30 08:27:58.238 SwiftApp[35316:1660108] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_TtCSs22ContiguousArrayStorage000000000B6E69C4 longLongValue]: unrecognized selector sent to instance 0xd7d0018'
*** First throw call stack:
(
0 CoreFoundation 0x00864646 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x0218f8e3 objc_exception_throw + 44
2 CoreFoundation 0x0086b575 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277
3 CoreFoundation 0x007b6407 ___forwarding___ + 1047
4 CoreFoundation 0x007b5fce _CF_forwarding_prep_0 + 14
5 CoreData 0x0035a125 -[NSSQLiteConnection execute] + 1349
6 CoreData 0x0036e197 -[NSSQLChannel selectRowsWithStatement:] + 119
7 CoreData 0x0037767d newFetchedRowsForFetchPlan_MT + 1741
8 CoreData 0x00362723 -[NSSQLCore newRowsForFetchPlan:] + 403
9 CoreData 0x00361d85 -[NSSQLCore objectsForFetchRequest:inContext:] + 709
10 CoreData 0x00361740 -[NSSQLCore executeRequest:withContext:error:] + 448
11 CoreData 0x0045c6a5 __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke + 2917
12 CoreData 0x00465be8 internalBlockToNSPersistentStoreCoordinatorPerform + 72
13 libdispatch.dylib 0x026a6488 _dispatch_client_callout + 14
14 libdispatch.dylib 0x0268ea38 _dispatch_barrier_sync_f_invoke + 124
15 libdispatch.dylib 0x0268e2c0 dispatch_barrier_sync_f + 89
16 CoreData 0x004574b3 _perform + 99
17 CoreData 0x00361345 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 1525
18 CoreData 0x0035f575 -[NSManagedObjectContext executeFetchRequest:error:] + 597
19 SwiftApp 0x000189b6 _TFC8SwiftApp11AppDelegate6parserfS0_FTGSQCSo11NSXMLParser_15didStartElementGSQSS_12namespaceURIGSQSS_13qualifiedNameGSQSS_10attributesGSQCSo12NSDictionary__T_ + 18086
20 SwiftApp 0x0001a335 _TToFC8SwiftApp11AppDelegate6parserfS0_FTGSQCSo11NSXMLParser_15didStartElementGSQSS_12namespaceURIGSQSS_13qualifiedNameGSQSS_10attributesGSQCSo12NSDictionary__T_ + 1221
21 Foundation 0x00d1c00d _startElementNs + 3178
22 libxml2.2.dylib 0x02e8333d xmlParseStartTag2 + 4426
23 libxml2.2.dylib 0x02e860b2 xmlParseTryOrFinish + 3828
24 libxml2.2.dylib 0x02e84fc2 xmlParseChunk + 952
25 Foundation 0x00d19054 -[NSXMLParser parseData:] + 314
26 Foundation 0x00d194f5 -[NSXMLParser parseFromStream] + 276
27 Foundation 0x00d19639 -[NSXMLParser parse] + 33
28 SwiftApp 0x00012b72 _TFC8SwiftApp11AppDelegate11applicationfS0_FTCSo13UIApplication29didFinishLaunchingWithOptionsGSqCSo12NSDictionary__Sb + 1970
29 SwiftApp 0x000133a5 _TToFC8SwiftApp11AppDelegate11applicationfS0_FTCSo13UIApplication29didFinishLaunchingWithOptionsGSqCSo12NSDictionary__Sb + 101
30 UIKit 0x0105bb37 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 291
31 UIKit 0x0105c875 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2920
32 UIKit 0x0105fa33 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1507
33 UIKit 0x01077eb8 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke + 59
34 UIKit 0x0105e77e -[UIApplication workspaceDidEndTransaction:] + 29
35 FrontBoardServices 0x0381bf1f -[FBSWorkspace clientEndTransaction:] + 87
36 FrontBoardServices 0x038234ed __53-[FBSWorkspaceClient _queue_handleTransactionBookEnd]_block_invoke + 49
37 CoreFoundation 0x00788f90 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 16
38 CoreFoundation 0x0077e133 __CFRunLoopDoBlocks + 195
39 CoreFoundation 0x0077d898 __CFRunLoopRun + 936
40 CoreFoundation 0x0077d22b CFRunLoopRunSpecific + 443
41 CoreFoundation 0x0077d05b CFRunLoopRunInMode + 123
42 UIKit 0x0105e095 -[UIApplication _run] + 571
43 UIKit 0x010616e5 UIApplicationMain + 1526
44 SwiftApp 0x0001e471 top_level_code + 97
45 SwiftApp 0x0001eaeb main + 43
46 libdyld.dylib 0x026d0ac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
错误在这里：
request.predicate = NSPredicate(format: "id = %@", [nodeId])
因为您将数组传递给predicateWithFormat
的“变量参数列表”形式。
这两个版本都应该适用：
request.predicate = NSPredicate(format: "id = %@", nodeId)
request.predicate = NSPredicate(format: "id = %@", argumentArray: [nodeId])
备注：NSManagedObject
文档声明您“非常不受鼓励”
在子类中重写description
方法。是的，这解决了我的问题。看起来像是初学者的错误，但是Xcode建议首先删除argumentArray:
。不过，谢谢你。@bouke:不客气。（我有一种感觉，Swift中桥接方法的自动完成还不能完美地工作。）