NSFetchedResultsController
이 있는데, 사용자가 새 개체를 만들 때마다 데이터가 저장되는 것을 확인했습니다. 그러나, 나는 아직 업데이 트되지 않는 유일한 것은 섹션과 행의 수를 발견했습니다 NSFetchedResultsController
. 왜 그런지 모르겠습니다.섹션 및 행 개수 NSFetchedResultsController
나는 다양한 방법으로 새로운 객체를 생성하는 것을 시도해 보았습니다. 또한 어떤 일이 벌어지고 있는지 보려고 프로세스의 모든 단계를 로깅하려고 시도했지만 실제로 이런 일을 기록 할 수있는 것은별로 없기 때문에 왜 이런 일이 발생했는지에 대한 정보는 거의 남지 않았습니다. .
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
NSLog(@"number of sections: %d", [[self.fetchedResultsController sections] count]);
return [[self.fetchedResultsController sections] count];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(@"number of rows: %d", [[[self.fetchedResultsController sections] objectAtIndex:section] numberOfObjects]);
return [[[self.fetchedResultsController sections] objectAtIndex:section] numberOfObjects];
}
- (void)saveForName:(NSString *)name
photo:(NSData *)photo
timePosted:(NSDate *)timePosted
details:(NSString *)details
dateAndTime:(NSDate *)dateTime
location:(NSString *)location
{
if (!self.shindysDatabase) {
NSURL *url = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
self.shindysDatabase = [[UIManagedDocument alloc] initWithFileURL:url];
NSLog(@"shindy database reset.");
}
Shindy *shindy = (Shindy *)[NSEntityDescription insertNewObjectForEntityForName:@"Shindy" inManagedObjectContext:self.shindysDatabase.managedObjectContext];
shindy.name = name;
shindy.photo = photo;
shindy.timePosted = timePosted;
shindy.details = details;
shindy.dateAndTime = dateTime;
shindy.location = location;
NSError *error = nil;
[self.shindysDatabase.managedObjectContext save:&error];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
}
Shindy *shindy = (Shindy *)[NSEntityDescription entityForName:@"Shindy" inManagedObjectContext:self.shindysDatabase.managedObjectContext];
shindy = [self.fetchedResultsController objectAtIndexPath:indexPath];
UIImageView *avatar = [[UIImageView alloc] initWithFrame:CGRectMake(20, 10, 64, 56)];
// Converting NSData to UIImage
avatar.image = shindy.photo;
avatar.clipsToBounds = NO;
[cell addSubview:avatar];
NSLog(@"avatar: %@", avatar);
// The name of the user who posted the shindy
UILabel *avatarName = [[UILabel alloc] initWithFrame:CGRectMake(90, 10, 125, 19)];
avatarName.font = [UIFont boldSystemFontOfSize:15];
avatarName.backgroundColor= [UIColor clearColor];
avatarName.text = shindy.name;
[cell addSubview:avatarName];
NSLog(@"avatarName: %@", avatarName);
// The time the shindy was posted
NSDateFormatter *timePostedFormatter = [[NSDateFormatter alloc] init];
[timePostedFormatter setDateFormat:@"mm"];
UILabel *timePosted = [[UILabel alloc] initWithFrame:CGRectMake(280, 10, 30, 20)];
timePosted.font = [UIFont systemFontOfSize:12];
timePosted.textColor = [UIColor lightGrayColor];
timePosted.backgroundColor= [UIColor clearColor];
timePosted.text = [timePostedFormatter stringFromDate:shindy.timePosted];
[cell addSubview:timePosted];
NSLog(@"Time posted: %@", timePosted);
// Formatting fetched NSDate into string
NSDateFormatter *dateAndTimeFormatter = [[NSDateFormatter alloc] init];
[timePostedFormatter setDateFormat:@"MM/DD/YYYY hh:mm"];
UILabel *dateAndTimeLabel = [[UILabel alloc] initWithFrame:CGRectMake(250, 70, 30, 20)];
dateAndTimeLabel.font = [UIFont systemFontOfSize:12];
dateAndTimeLabel.backgroundColor= [UIColor clearColor];
dateAndTimeLabel.text = [dateAndTimeFormatter stringFromDate:shindy.dateAndTime];
[cell addSubview:dateAndTimeLabel];
NSLog(@"date and time: %@", dateAndTimeLabel.text);
// Details of the Shindy
UILabel *shindyDescription = [[UILabel alloc] initWithFrame:CGRectMake(90, 20, 220 , 50)];
shindyDescription.numberOfLines = 3;
shindyDescription.font = [UIFont systemFontOfSize:12];
shindyDescription.backgroundColor = [UIColor clearColor];
shindyDescription.text = shindy.details;
[cell addSubview:shindyDescription];
NSLog(@"details: %@", shindyDescription.text);
return cell;
}
상용구 코드 :
이 내가 객체가 변경 될 때 업데이트를해야 할 단지 코드가 어쨌든, 여기에 코드입니다.
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
// The fetch controller is about to start sending change notifications, so prepare the table view for updates.
[self.tableView beginUpdates];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {
UITableView *tableView = self.tableView;
switch(type) {
case NSFetchedResultsChangeInsert:
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeDelete:
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeUpdate:
[self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
break;
case NSFetchedResultsChangeMove:
[tableView deleteRowsAtIndexPaths:[NSArray
arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
[tableView insertRowsAtIndexPaths:[NSArray
arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
break;
}
}
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {
switch(type) {
case NSFetchedResultsChangeInsert:
[self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
case NSFetchedResultsChangeDelete:
[self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
break;
}
}
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
// The fetch controller has sent all current change notifications, so tell the table view to process all updates.
[self.tableView endUpdates];
}
나는 이미 다른 곳에서 내 코드에있는 것들을 모두 셋업했다. 이 코드는 일종의 "기본"코드로 간주되기 때문에 게시하지 않아도됩니다. – jakenberg
"기본"코드로 얼마나 많은 실수가 있었는지보고 놀랍니다. –
Apple 문서에서 복사하여 붙여 넣습니다. 하지만 당신이 정말로 그것을보고 싶어, 그래서 그것을 보여 내 질문을 편집했습니다 :) – jakenberg