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在將節標題添加到我的應用程序中的某個表之前，我能夠使用commitEditingStyle函數刪除行，而沒有任何問題。我決定實現節標題，以方便用戶查看按日期添加到表中的項目。此功能正常工作。在實現節標題後，我遇到了刪除行的問題，但是感謝來自stackoverflow上好人的幫助，問題得到部分解決。經過一些測試後，我意識到如果行在同一部分中，並且我試圖從部分的首行開始按順序刪除多行，則首行會刪除正常，但嘗試刪除第二行會導致應用程序崩潰。如果我刪除第一行以外的所有行，然後刪除最後一行，它可以正常工作。 Xcode沒有指出它在調試日誌中崩潰的原因。將節標題添加到uitableview後刪除行的問題
下面是的cellForRowAtIndexPath函數的代碼：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
AgendaCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[AgendaCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];
}
NSString *strDate = [dateArray objectAtIndex:indexPath.section];
NSMutableArray *dateSection = [tempDict objectForKey:strDate];
NSManagedObject *object = [dateSection objectAtIndex:indexPath.row];
cell.sessionNameLabel.text = [object valueForKey:@"sessionname"];
cell.sessionNameLabel.textColor = [UIColor blueColor];
cell.sessionDateLabel.text = [object valueForKey:@"sessiondate"];
cell.sessionDateLabel.textColor = [UIColor brownColor];
cell.sessionTimeLabel.text = [object valueForKey:@"sessiontime"];
cell.sessionTimeLabel.textColor = [UIColor brownColor];
return cell;
}
這裏是我的表刷新功能代碼：
- (void) refreshTable
{
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
// Edit the entity name as appropriate.
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Sessnotes" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
[fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"agenda == 'Yes'"]];
// Edit the sort key as appropriate.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"sessiondate" ascending:YES];
NSArray *sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
NSArray *results = [self.managedObjectContext executeFetchRequest:fetchRequest error:nil];
[self.refreshControl endRefreshing];
self.objects = results;
if (results.count == 0) {
NSString *message = @"You have not added any sessions to your planner.";
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Notification"
message:message
delegate:self
cancelButtonTitle:@"Ok"
otherButtonTitles:nil,nil];
[alertView show];
}
else if (results.count > 0){
tempDict = nil;
tempDict = [[NSMutableDictionary alloc] init];
NSString *strPrevDate= [[results objectAtIndex:0] valueForKey:@"sessiondate"];
NSLog(@"strPrevDate value is: %@", strPrevDate);
NSString *strCurrDate = nil;
NSMutableArray *tempArray = [[NSMutableArray alloc] init];
//Add the Similar Date data in An Array then add this array to Dictionary
//With date name as a Key. It helps to easily create section in table.
for(int i=0; i< [results count]; i++)
{
strCurrDate = [[results objectAtIndex:i] valueForKey:@"sessiondate"];
if ([strCurrDate isEqualToString:strPrevDate])
{
[tempArray addObject:[results objectAtIndex:i]];
}
else
{
[tempDict setValue:[tempArray copy] forKey:strPrevDate];
strPrevDate = strCurrDate;
[tempArray removeAllObjects];
[tempArray addObject:[results objectAtIndex:i]];
}
}
//Set the last date array in dictionary
[tempDict setValue:[tempArray copy] forKey:strPrevDate];
NSArray *tArray = [tempDict allKeys];
//Sort the array in ascending order
dateArray = [tArray sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)];
}
[self.tableView reloadData];
}
下面是commitEditingStyle函數的代碼：
- (void)tableView:(UITableView *)tableView commitEditingStyle: (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
//add code here for when you hit delete
NSManagedObject *object = [self.objects objectAtIndex:indexPath.row];
NSManagedObjectContext *context = [self managedObjectContext];
[context deleteObject:[context objectWithID:[object objectID]]];
NSError *error = nil;
// Save the object to persistent store
if (![context save:&error]) {
NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
}
NSMutableArray *array = [self.objects mutableCopy];
[array removeObjectAtIndex:indexPath.row];
self.objects = array;
[tableView reloadData];
}
}