从一个NSManagedObjectContext保存的更改不会反映在主NSManagedObjectContext上
||
我在main1ѭ中创建了一个主
NSManagedObjectContext
NSManagedObjectContext
NSError* error = nil;
if ([managedObjectContext hasChanges]) {
NSLog(@\"This new object has changes\");
}
if (![managedObjectContext save:&error]) {
NSLog(@\"Failed to save to data store: %@\", [error localizedDescription]);
NSArray* detailedErrors = [[error userInfo] objectForKey:NSDetailedErrorsKey];
if(detailedErrors != nil && [detailedErrors count] > 0) {
for(NSError* detailedError in detailedErrors) {
NSLog(@\" DetailedError: %@\", [detailedError userInfo]);
}
}
else {
NSLog(@\" %@\", [error userInfo]);
}
}
没有找到相关结果
已邀请:
1 个回复
刷骸码
// second managed object context save // register for the notification [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleDidSaveNotification:) name:NSManagedObjectContextDidSaveNotification object:secondManagedObjectContext]; // rest of the code ommitted for clarity if (![secondManagedObjectContext save:&error]) { // ... } // unregister from notification [[NSNotificationCenter defaultCenter] removeObserver:self name:NSManagedObjectContextDidSaveNotification object:secondManagedObjectContext];- (void)handleDidSaveNotification:(NSNotification *)note { [firstManagedObjectContext mergeChangesFromContextDidSaveNotification:note]; }