我已阅读我的 XCode 数据模型发生任何更改后，我不断收到“保存操作失败”
错误代码：
This NSPersistentStoreCoordinator has no persistent stores. It cannot perform a save operation.
(null)
(
0 CoreFoundation 0x36aeb8a7 __exceptionPreprocess + 186
1 libobjc.A.dylib 0x32f02259 objc_exception_throw + 32
2 CoreData 0x353a8fe7 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 282
3 CoreData 0x35411287 -[NSManagedObjectContext save:] + 522
4 myshine 0x001a1e59 _mh_execute_header + 1293913
5 myshine 0x0006cacd _mh_execute_header + 27341
6 myshine 0x000aa829 _mh_execute_header + 280617
7 myshine 0x000abe07 _mh_execute_header + 286215
8 myshine 0x0009a12b _mh_execute_header + 213291
9 myshine 0x00099fb3 _mh_execute_header + 212915
10 myshine 0x0009ad9b _mh_execute_header + 216475
11 myshine 0x000978a7 _mh_execute_header + 202919
12 CoreFoundation 0x36a80533 _signalEventSync + 74
13 CoreFoundation 0x36a804e1 _cfstream_solo_signalEventSync + 76
14 CoreFoundation 0x36a80353 _CFStreamSignalEvent + 374
15 CFNetwork 0x3367b121 _ZN12SocketStream40dispatchSignalFromSocketCallbackUnlockedEP24SocketStreamSignalHolder + 24
16 CFNetwork 0x33607bb9 _ZN12SocketStream14socketCallbackEP10__CFSocketmPK8__CFDataPKv + 112
17 CFNetwork 0x33607b39 _ZN12SocketStream22_SocketCallBack_streamEP10__CFSocketmPK8__CFDataPKvPv + 64
18 CoreFoundation 0x36ac22ef __CFSocketPerformV0 + 638
19 CoreFoundation 0x36abfad3 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
20 CoreFoundation 0x36abf29f __CFRunLoopDoSources0 + 214
21 CoreFoundation 0x36abe045 __CFRunLoopRun + 652
22 CoreFoundation 0x36a414a5 CFRunLoopRunSpecific + 300
23 CoreFoundation 0x36a4136d CFRunLoopRunInMode + 104
24 GraphicsServices 0x34c08439 GSEventRunModal + 136
25 UIKit 0x34ceacd5 UIApplicationMain + 1080
26 myshine 0x00069f0b _mh_execute_header + 16139
27 myshine 0x000686b0 _mh_execute_header + 9904
)
我的代码：
+ (CoreDataManager *)sharedInstance {
@synchronized(self) {
if (instance == nil) {
instance = [[CoreDataManager alloc] init];
}
}
return instance;
}
-(NSManagedObjectModel *)getmanagedObjectModel:(NSManagedObjectModel *)managedobjectModel
{
if (managedobjectModel != nil) {
return managedobjectModel;
}
// managedobjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"PushNoticationModel" withExtension:@"momd"];
managedobjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return managedobjectModel;
}
-(NSPersistentStoreCoordinator *)persistentStoreCoordinator:(NSString*)modelName
{
if (persistentStoreCoordinator != nil) {
return persistentStoreCoordinator;
}
NSString *docs = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
@"PushNoticationModal.sqlite"
NSURL *storeUrl = [NSURL fileURLWithPath:[docs stringByAppendingPathComponent:modelName]];
NSError *error = nil;
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc]initWithManagedObjectModel:[self getmanagedObjectModel:self.managedObjectModel]];
if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) {
NSLog(@"persistentStoreCoordinator Error: %@,%@",error,[error userInfo]);
}
return persistentStoreCoordinator;
}
-(NSManagedObjectContext *)managedObjectContext:(NSString*)modelName
{
if (managedObjectContext != nil) {
return managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator =[self persistentStoreCoordinator:modelName];
if (coordinator != nil) {
managedObjectContext = [[NSManagedObjectContext alloc]init];
[managedObjectContext setPersistentStoreCoordinator:coordinator];
}
return managedObjectContext;
}
-(NSManagedObjectContext *)managedObjectContext:(NSString*)modelName managedObjectContext:(NSManagedObjectContext *)managedContext
{
if (managedContext != nil) {
return managedContext;
}
NSPersistentStoreCoordinator *coordinator =[self persistentStoreCoordinator:modelName];
if (coordinator != nil) {
managedContext = [[NSManagedObjectContext alloc]init];
[managedContext setPersistentStoreCoordinator:coordinator];
}
return managedContext;
}
我用过
-(NSManagedObjectContext *)getManagedObjectContext{
return [[CoreDataManager sharedInstance] managedObjectContext:kSqlname managedObjectContext:[CoreDataManager sharedInstance].managedObjectContext];
}
如果我每次都需要修改kSqlname，当我的代码数据添加新字段时？例如，如果修改 sqlname：
NSURL *storeUrl = [NSURL fileURLWithPath:[docs stringByAppendingPathComponent:modelName]];
如果我需要重命名模型名，例如：version1 modelName=version1.sqlite 当我添加新字段 modelName=version2.sqlite
编辑：我认为不是在不同的线程，因为我测试了很多次没有给我错误，只有其他用户更新版本可能会给出错误
-(void)refreshData{
NSLog(@"ChatHistoryViewController2333");
isRefresh=NO;
AppDelegate *delegate = (AppDelegate *) [[UIApplication sharedApplication] delegate];
dispatch_queue_t downloadQueue = dispatch_queue_create("refresh history", NULL);
dispatch_async(downloadQueue, ^{
NSManagedObjectContext *managedObjectContext =[self getManagedObjectContext];
readArray=[[CoreDataManager sharedInstance] readEvent:@"ChatHistoryEntity" SortDescriptor:@"when" managedObjectContext:managedObjectContext];
__block NSMutableArray *chatArr=[[NSMutableArray alloc]init];
if(readArray.count>0){
for(int i=0;i<readArray.count;i++){
// ChatHistoryEntity *chatHistoryEntity=[readArray objectAtIndex:(readArray.count-i-1)];
ChatHistoryEntity *chatHistoryEntity=[readArray objectAtIndex:i];
People *people=[[People alloc]init];
people.lastActivity=chatHistoryEntity.lastChat;
people.avatarsmall=chatHistoryEntity.avatarsmall;
people.when=chatHistoryEntity.when;
people.source=chatHistoryEntity.source;
people.idName=chatHistoryEntity.idName;
people.foreignId=[NSString stringWithFormat:@"%@",chatHistoryEntity.from];
NSManagedObjectContext *managedObjectContext =[self getManagedObjectContext];
int count=[[CoreDataManager sharedInstance]Count_ChatEventEntity:chatHistoryEntity.from to:delegate.myAuraId managedObjectContext:managedObjectContext];
people.readnum=[NSString stringWithFormat:@"%d",count];
NSString *distanceStr;
if (people.lastActivity) {
distanceStr=[ModelClass CheckIsNull:people.lastActivity];
}
if (chatHistoryEntity.name) {
people.screenName=[ModelClass CheckIsNull:chatHistoryEntity.name];
}
// NSLog(@"distanceStr:%@",distanceStr);
if (distanceStr==nil||[distanceStr isEqualToString:@"(null)"]||
people.screenName==nil||[people.screenName isEqualToString:@"(null)"]){
}else{
NSLog(@"people.foreignId=%@ people.screenName=%@ people.source=%@",chatHistoryEntity.from ,chatHistoryEntity.name ,chatHistoryEntity.source);
NSLog(@"people.idName=%@",chatHistoryEntity.idName);
[chatArr addObject:people];
}
}
}
dispatch_async(dispatch_get_main_queue(), ^{
if (chatListArry) {
chatListArry=[[NSMutableArray alloc]init];
}
chatListArry=chatArr;
if ([chatListArry count]==0) {
self.tableView1.hidden=YES;
nodataView.hidden=NO;
}else{
self.tableView1.hidden=NO;
nodataView.hidden=YES;
[self.tableView1 reloadData];
}
chatArr=nil;
});
});
dispatch_release(downloadQueue);
}