Ios 带有自定义NSSortDescriptor的NSFetchedResultsController
我有一个Ios 带有自定义NSSortDescriptor的NSFetchedResultsController,ios,core-data,nssortdescriptor,Ios,Core Data,Nssortdescriptor,我有一个Person对象，其中包含firstName、lastName和类别（字符串） 我想创建一个NSSortDescriptor，它允许我获取所有按“category”排序的Person，然后按firstName排序 示例： 所需的顺序如下所示： 潜在客户、潜在客户、总承包商、总承包商。 然后，在类别中，它们必须按字母顺序排列（lastName，firstName） 我尝试使用NSSortDescriptor（键：，升序：，比较器：）但没有成功 下面是NSFetchRequest的我的代码
PersonfirstNamelastName类别NSSortDescriptorcategoryPersonfirstNameNSSortDescriptor（键：，升序：，比较器：）NSFetchRequest的我的代码
let categoryDescriptor = NSSortDescriptor(key: "category", ascending: true) { (category1, category2) -> ComparisonResult in
let arrayCategory = [PROSPECT, INATIVE_1Y, GC, VGC]
let c1Index = arrayCategory.firstIndex(of: category1) ?? 0
let c2Index = arrayCategory.firstIndex(of: category2) ?? 0
if c1Index < c2Index {
return .orderedAscending
} else if c1Index > c2Index {
return .orderedDescending
}
return .orderedSame
}
objectFetchRequest.sortDescriptors?.append(categoryDescriptor)
let lastNameSortDescriptor = NSSortDescriptor(key: "lastName", ascending: true)
objectFetchRequest.sortDescriptors?.append(lastNameSortDescriptor)
let firstNameSortDescriptor = NSSortDescriptor(key: "firstName", ascending: true)
objectFetchRequest.sortDescriptors?.append(firstNameSortDescriptor)
let categoryDescriptor=NSSortDescriptor（键：“category”，升序：true）{（category1，category2）->比较中的结果
让arrayCategory=[PROSPECT，INATIVE_1Y，GC，VGC]
设c1Index=arrayCategory.firstIndex（属于：category1）？？0
设c2Index=arrayCategory.firstIndex（属于：category2）？？0
如果c1索引c2Index，则为else{
return.orderedDescending
}
退货。订购相同
}
objectFetchRequest.sortDescriptors？.append（categoryDescriptor）
让lastNameSortDescriptor=NSSortDescriptor（键：“lastName”，升序：true）
objectFetchRequest.sortDescriptors？.append（lastNameSortDescriptor）
让firstNameSortDescriptor=NSSortDescriptor（键：“firstName”，升序：true）
objectFetchRequest.sortDescriptors？.append（firstNameSortDescriptor）
应用程序崩溃：
CoreData: error: SQLCore dispatchRequest: exception handling request: <NSSQLFetchRequestContext: 0x600002e82a00> , unsupported NSSortDescriptor (comparator blocks are not supported) with userInfo of (null)
2019-11-05 20:05:59.779136+0200 APP NAME [45129:1204138] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'unsupported NSSortDescriptor (comparator blocks are not supported)'
*** First throw call stack:
(
0 CoreFoundation 0x0000000110efa8db __exceptionPreprocess + 331
1 libobjc.A.dylib 0x000000010f99fac5 objc_exception_throw + 48
2 CoreData 0x00000001109ba53e -[NSSQLGenerator newSQLStatementForRequest:ignoreInheritance:countOnly:nestingLevel:nestIsWhereScoped:requestContext:] + 1646
3 CoreData 0x00000001109c4b0e -[NSSQLiteAdapter _statementForFetchRequestContext:ignoreInheritance:countOnly:nestingLevel:] + 142
4 CoreData 0x00000001108724c4 -[NSSQLiteAdapter newSelectStatementWithFetchRequestContext:ignoreInheritance:] + 116
5 CoreData 0x0000000110a0feb3 -[NSSQLFetchRequestContext _createStatement] + 67
6 CoreData 0x0000000110a0fe4e -[NSSQLFetchRequestContext fetchStatement] + 142
7 CoreData 0x0000000110a10e3b -[NSSQLFetchRequestContext executeRequestCore:] + 27
8 CoreData 0x0000000110a7a790 -[NSSQLStoreRequestContext executeRequestUsingConnection:] + 208
9 CoreData 0x0000000110a4f0eb __52-[NSSQLDefaultConnectionManager handleStoreRequest:]_block_invoke + 75
10 libdispatch.dylib 0x000000011271adb5 _dispatch_client_callout + 8
11 libdispatch.dylib 0x0000000112728d08 _dispatch_lane_barrier_sync_invoke_and_complete + 132
12 CoreData 0x0000000110a4efd0 -[NSSQLDefaultConnectionManager handleStoreRequest:] + 336
13 CoreData 0x0000000110a56c24 -[NSSQLCoreDispatchManager routeStoreRequest:] + 308
14 CoreData 0x000000011099f288 -[NSSQLCore dispatchRequest:withRetries:] + 232
15 CoreData 0x000000011099bffd -[NSSQLCore processFetchRequest:inContext:] + 93
16 CoreData 0x00000001108719ce -[NSSQLCore executeRequest:withContext:error:] + 574
17 CoreData 0x0000000110980657 __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke + 2039
18 CoreData 0x0000000110978870 -[NSPersistentStoreCoordinator _routeHeavyweightBlock:] + 288
19 CoreData 0x00000001108711a0 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 1296
20 CoreData 0x000000011086f475 -[NSManagedObjectContext executeFetchRequest:error:] + 933
21 CoreData 0x0000000110a1f9c0 __43-[NSFetchedResultsController performFetch:]_block_invoke + 448
22 CoreData 0x000000011098d104 gutsOfBlockToNSPersistentStoreCoordinatorPerform + 212
23 libdispatch.dylib 0x000000011271adb5 _dispatch_client_callout + 8
24 libdispatch.dylib 0x0000000112728d08 _dispatch_lane_barrier_sync_invoke_and_complete + 132
25 CoreData 0x0000000110978146 -[NSPersistentStoreCoordinator performBlockAndWait:] + 198
26 CoreData 0x00000001108b2a2a developerSubmittedBlockToNSManagedObjectContextPerform + 170
27 CoreData 0x00000001108b28ff -[NSManagedObjectContext performBlockAndWait:] + 239
28 CoreData 0x0000000110a1fd11 -[NSFetchedResultsController _recursivePerformBlockAndWait:withContext:] + 145
29 CoreData 0x0000000110a1f72b -[NSFetchedResultsController performFetch:] + 299
30 APP NAME 0x0000000109f25278 $s20APP_NAME22GeneralFetchControllerC14refreshResultsyySSF + 1512
31 APP NAME 0x0000000109daca74 $s20APP_NAME19LocalClientSearchVCC14refreshResultsyySSF + 164
32 APP NAME 0x0000000109f24b8b $s20APP_NAME22GeneralFetchControllerC024initializeFetchedResultsG0yyF + 619
33 APP NAME 0x0000000109f247fa $s20APP_NAME22GeneralFetchControllerC11viewDidLoadyyFyycfU_ + 58
34 APP NAME 0x0000000109f2487d $s20APP_NAME22GeneralFetchControllerC11viewDidLoadyyFyycfU_TA + 13
35 APP NAME 0x0000000109c78c4d $sIeg_IeyB_TR + 45
36 libdispatch.dylib 0x0000000112719d7f _dispatch_call_block_and_release + 12
37 libdispatch.dylib 0x000000011271adb5 _dispatch_client_callout + 8
38 libdispatch.dylib 0x0000000112728080 _dispatch_main_queue_callback_4CF + 1540
39 CoreFoundation 0x0000000110e61a79 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9
40 CoreFoundation 0x0000000110e5c126 __CFRunLoopRun + 2310
41 CoreFoundation 0x0000000110e5b4d2 CFRunLoopRunSpecific + 626
42 GraphicsServices 0x00000001140b42fe GSEventRunModal + 65
43 UIKitCore 0x000000011a14ffc2 UIApplicationMain + 140
44 APP NAME 0x000000010a307ffb main + 75
45 libdyld.dylib 0x000000011278f541 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
CoreData:错误：SQLCore dispatchRequest:异常处理请求：，不支持的NSSortDescriptor（不支持比较程序块），userInfo为（null）
2019-11-05 20:05:59.779136+0200应用程序名称[45129:1204138]***由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因是：“不支持的NSSortDescriptor（不支持比较器块）”
***第一次抛出调用堆栈：
(
0 CoreFoundation 0x0000000110efa8db例外预处理+331
1 libobjc.A.dylib 0x000000010f99fac5 objc_异常_抛出+48
2 CoreData 0x00000001109ba53e-[NSSQLGenerator newSQLStatementForRequest:IgnoreInheritation:countOnly:nestingLevel:NestisWhereScope:requestContext:+1646
3 CoreData 0x00000001109c4b0e-[NSSQLiteAdapter\u语句ForFetchRequestContext:IgnoreInheritation:countOnly:nestingLevel:+142
4 CoreData 0x00000001108724c4-[NSSQLiteAdapter newSelectStatementWithFetchRequestContext:IgnoreInheritation:+116
5 CoreData 0x000000011A0FEB3-[NSSQLFetchRequestContext\u createStatement]+67
6 CoreData 0x000000011A0FE4E-[NSSQLFetchRequestContext fetchStatement]+142
7 CoreData 0x000000011010E3B-[NSSQLFetchRequestContext ExecuterRequestCore:+27
8 CoreData 0x00000001107A790-[NSSQLStoreRequestContext ExecuterRequestUsingConnection:+208
9 CoreData 0x0000000110A4 F0EB__52-[NSSQLDefaultConnectionManager handleStoreRequest:][U block_invoke+75
10 libdispatch.dylib 0x0000000111271ADB5 _dispatch_client_callout+8
11 libdispatch.dylib 0x0000000112728d08 _调度_车道_障碍_同步_调用_和_完成+132
12 CoreData 0x00000001104EFD0-[NSSQLDefaultConnectionManager handleStoreRequest:+336
13 CoreData 0x000000011056C24-[NSSQLCoreDispatchManager路由请求：+308
14 CoreData 0x000000011099f288-[NSSQLCore dispatchRequest:withRetries:][232
15 CoreData 0x000000011099bffd-[NSSQLCore processFetchRequest:inContext:+93
16 CoreData 0x00000001108719ce-[NSSQLCore executeRequest:withContext:error:+574
17 CoreData 0x0000000110980657 u 65-[NSPersistentStoreCoordinator executeRequest:withContext:error:][u block_invoke+2039
18核心数据0x0000000110978870-[NSPersistentStoreCoordinator\u routeHeavyweightBlock:+288
19 CoreData 0x00000001108711a0-[NSPersistentStoreCoordinator executeRequest:withContext:error:+1296
20 CoreData 0x000000011086f475-[NSManagedObjectContext executeFetchRequest:错误：][933
21 CoreData 0x0000000110a1f9c0\uU43-[NSFETCHEEDRESULTSCONTROLLER performFetch:]块调用+448
22 CoreData 0x000000011098d104块体槽口存储协调器性能+212
23 libdispatch.dylib 0x0000000111271ADB5 _dispatch_client_callout+8
24 libdispatch.dylib 0x0000000112728d08 _调度_车道_障碍_同步_调用_和_完成+132
25核心数据0x0000000110978146-[NSPersistentStoreCoordinator performBlockAndWait:+198
26 CoreData 0x00000001108b2a2a开发人员SubmittedBlocktonsManagedObjectContextPerform+170
27 CoreData 0x00000001108b28ff-[NSManagedObjectContext performBlockAndWait:+239
28 CoreData 0x0000000110a1fd11-[NSFetchedResultsController\u递归执行锁和等待：withContext:+145
29 CoreData 0x0000000110a1f72b-[NSFetchedResultsController性能测试：+299
30应用程序名称0x0000000109f25278$s20APP_名称22通用蚀刻控制器14刷新结果YYSSF+1512
31应用程序名称0x0000000109daca74$s20APP_名称19LocalClientSearchVCC14RefreshResultsYYSSF+164
32应用程序名称
var categoryIndex : Int {
switch category {
case "PROSPECT": return 0
case "INATIVE_1Y": return 1
case "GC": return 2
case "VGC": return 3
default: fatalError("category not available")
}
}