我从其他人那里继承了一个项目，它是在旧版本的Xcode中创建的。升级后，我发现了一些我必须解决的问题，但这个问题让我感到难过。
我有一个CoreData模型，其中包含由Xcode（NSManagedObject）生成的类。我有一个Meeting对象，其中包含使用Speaker类的speaker属性。这些关系都已到位，但在第一次尝试分配会议实例的发言人属性时，我得到以下内容：
2016-05-26 16:32:46.276 SignMeIn[7829:316171] -[NSKnownKeysDictionary1 setSpeaker:]: unrecognized selector sent to instance 0x7a9042b0
2016-05-26 16:32:46.288 SignMeIn[7829:316171] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSKnownKeysDictionary1 setSpeaker:]: unrecognized selector sent to instance 0x7a9042b0'
*** First throw call stack:
(
0 CoreFoundation 0x033ea494 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x02ea4e02 objc_exception_throw + 50
2 CoreFoundation 0x033f4253 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x0332989d ___forwarding___ + 1037
4 CoreFoundation 0x0332946e _CF_forwarding_prep_0 + 14
5 SignMeIn 0x000be242 +[CoreDataManager addSpeakerWithDictionary:forMeeting:] + 1458
6 SignMeIn 0x000bf6b6 +[CoreDataManager insertMeetingsFromArray:] + 902
7 SignMeIn 0x000b7f5b -[SyncView request:hasBeenTerminatedWithSuccess:forServiceMethod:] + 2203
8 SignMeIn 0x0009c0f6 __91+[OnsiteAttendeeAPI callApiMethod:isPost:parametersDictionary:delegate:shouldStartRequest:]_block_invoke.101 + 118
9 SignMeIn 0x00070425 -[ASIHTTPRequest reportFinished] + 213
10 libobjc.A.dylib 0x02eb9059 -[NSObject performSelector:withObject:] + 70
11 Foundation 0x023eb5f8 __NSThreadPerformPerform + 323
12 CoreFoundation 0x032fce5f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
13 CoreFoundation 0x032f2aeb __CFRunLoopDoSources0 + 523
14 CoreFoundation 0x032f1f08 __CFRunLoopRun + 1032
15 CoreFoundation 0x032f1846 CFRunLoopRunSpecific + 470
16 CoreFoundation 0x032f165b CFRunLoopRunInMode + 123
17 GraphicsServices 0x04a71664 GSEventRunModal + 192
18 GraphicsServices 0x04a714a1 GSEventRun + 104
19 UIKit 0x00e64eb9 UIApplicationMain + 160
20 SignMeIn 0x000534f2 main + 178
21 libdyld.dylib 0x040aaa25 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我的Meeting类具有Speaker *类型的speaker属性，.m中的所有内容都有@dynamic语句，应该创建getter / setter。
以下是代码：
+ (void) addSpeakerWithDictionary: (NSDictionary *) speakerDict forMeeting: (Meeting *) aMeeting
{
int speakerID = [speakerDict[@"id"] intValue];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"identification = %d AND %@ IN meeting", speakerID, aMeeting];
NSArray *speakersArray = [CoreDataManager fetchObjects:@"Speaker" withSortDescriptors:nil andPredicate:predicate];
if (speakersArray.count == 0)
{
Speaker *speaker = [NSEntityDescription insertNewObjectForEntityForName:@"Speaker" inManagedObjectContext:[CoreDataManager managedObjectContext]];
speaker.degree = speakerDict[@"degree"];
speaker.firstName = speakerDict[@"firstName"];
speaker.identification = @(speakerID);
speaker.lastName = speakerDict[@"lastName"];
speaker.preTitle = speakerDict[@"preTitle"];
speaker.version = speakerDict[@"version"];
aMeeting.speaker = speaker;
}
非常感谢任何帮助。谢谢！
编辑：这是调用方法：
+ (void) insertMeetingsFromArray: (NSArray *) meetingsArray
{
for (NSDictionary *dict in meetingsArray)
{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"identification = %d AND user = %@", [dict[@"id"] intValue], SessionManagerInstance.loggedUser];
NSArray *meetArray = [CoreDataManager fetchObjects:@"Meeting" withSortDescriptors:nil andPredicate:predicate];
if (meetArray.count)
{
Meeting *meeting = meetArray[0];
[CoreDataManager addSpeakerWithDictionary:dict[@"speaker"] forMeeting:meeting];
}
else
[CoreDataManager insertMeetingWithDictionary:dict];
}
[CoreDataManager saveContext];
}
和
+ (void) insertMeetingWithDictionary: (NSDictionary *) dict
{
// NSLog(@"dict: %@", dict);
Meeting *meeting = [NSEntityDescription insertNewObjectForEntityForName:@"Meeting" inManagedObjectContext:[CoreDataManager managedObjectContext]];
meeting.brand = dict[@"brand"];
meeting.category = dict[@"category"];
meeting.city = dict[@"city"];
meeting.closed = @([dict[@"closed"] boolValue]);
meeting.date = [Utilities dateFromDateTime:dict[@"date"]];
meeting.dateString = dict[@"dateString"];
meeting.identification = @([dict[@"id"] intValue]);
meeting.initiative = dict[@"initiative"];
meeting.location = dict[@"location"];
meeting.notes = dict[@"notes"];
meeting.state = dict[@"state"];
meeting.timeZone = dict[@"timeZone"];
meeting.title = dict[@"title"];
meeting.type = dict[@"type"];
[meeting setUser:SessionManagerInstance.loggedUser];
[CoreDataManager addOrInsertRepWithDictionary:dict[@"rep"] forMeeting:meeting];
[CoreDataManager addSpeakerWithDictionary:dict[@"speaker"] forMeeting:meeting];
[CoreDataManager insertGroupsFromArray:dict[@"questiongroups"] forMeeting:meeting];
}
更新了课程：
Meeting.h（在.m中使用@dynamic）
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@class Attendee, Group, Rep, Speaker, User;
@interface Meeting : NSManagedObject
@property (nonatomic, retain) NSString * brand;
@property (nonatomic, retain) NSString * category;
@property (nonatomic, retain) NSString * city;
@property (nonatomic, retain) NSNumber * closed;
@property (nonatomic, retain) NSDate * date;
@property (nonatomic, retain) NSString * dateString;
@property (nonatomic, retain) NSNumber * identification;
@property (nonatomic, retain) NSString * initiative;
@property (nonatomic, retain) NSString * location;
@property (nonatomic, retain) NSNumber * needsToBeSubmitted;
@property (nonatomic, retain) NSString * notes;
@property (nonatomic, retain) NSString * state;
@property (nonatomic, retain) NSString * timeZone;
@property (nonatomic, retain) NSString * title;
@property (nonatomic, retain) NSString * transactionId;
@property (nonatomic, retain) NSString * type;
@property (nonatomic, retain) NSSet *attendees;
@property (nonatomic, retain) NSSet *groups;
@property (nonatomic, retain) Rep *rep;
@property (nonatomic, retain) Speaker *speaker;
@property (nonatomic, retain) User *user;
@end
@interface Meeting (CoreDataGeneratedAccessors)
- (void)addAttendeesObject:(Attendee *)value;
- (void)removeAttendeesObject:(Attendee *)value;
- (void)addAttendees:(NSSet *)values;
- (void)removeAttendees:(NSSet *)values;
- (void)addGroupsObject:(Group *)value;
- (void)removeGroupsObject:(Group *)value;
- (void)addGroups:(NSSet *)values;
- (void)removeGroups:(NSSet *)values;
@end
Speaker.h（在.m中使用@dynamic）
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@interface Speaker : NSManagedObject
@property (nonatomic, retain) NSString * degree;
@property (nonatomic, retain) NSString * firstName;
@property (nonatomic, retain) NSNumber * identification;
@property (nonatomic, retain) NSString * lastName;
@property (nonatomic, retain) NSString * preTitle;
@property (nonatomic, retain) NSString * version;
@property (nonatomic, retain) NSSet *meeting;
@end
@interface Speaker (CoreDataGeneratedAccessors)
- (void)addMeetingObject:(NSManagedObject *)value;
- (void)removeMeetingObject:(NSManagedObject *)value;
- (void)addMeeting:(NSSet *)values;
- (void)removeMeeting:(NSSet *)values;
@end
答案 0 :(得分：0)
提及NSKnownKeysDictionary1几乎肯定意味着这一行：
[CoreDataManager fetchObjects:@"Meeting" withSortDescriptors:nil andPredicate:predicate];
...正在执行获取请求，其结果类型为NSDictionaryResultType。这意味着meetArray[0]是一个字典，而不是一个托管对象。它没有setSpeaker方法，导致您看到的错误。
您可以更改获取请求以返回托管对象，除非您出于某种原因需要将它们作为字典。但你不能使用这样的词典。
答案 1 :(得分：0)
确保当前的Core Data模型具有正确的属性。
我遇到了一个与Core Data类似的问题，我遇到了一个无法识别的选择器，该设置器方法错误。我无意中将当前Core Data模型中的属性重命名为与Core Data类不同的名称。