从 Table 视图中删除行

Question

我正在开发 IOS 应用程序。删除 table 视图中的行，并在 table 视图中的核心数据中加载数据。当单击删除按钮应用程序崩溃。原因是原因：Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (18) must be equal to the number of rows contained in that section before the update (18), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out)...

_fetchedobj 是一个 NSArray，用于从核心数据中获取数据

//Code is
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    return _fetchedobj.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *MyIdentifier = @"MyReuseIdentifier";
    UITableViewCell *cell = [myTable dequeueReusableCellWithIdentifier:MyIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault  reuseIdentifier:MyIdentifier];
    }
    data = [_fetchedobj objectAtIndex:indexPath.row];
    return cell;
}

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath*)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [tableView beginUpdates];
        NSManagedObject *managedObject = [_fetchedobj objectAtIndex:indexPath.row];
        [self.managedObjectContext deleteObject:managedObject];
        [myTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
        [myTable endUpdates];
    }
}

Answer 1

尝试使用此行删除 table 视图的行

[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

Answer 2

您是否忘记从您的数据源数组中删除该对象？

尝试重新填充您的 _fetchedobj，因为您必须在删除后配置您的模型。有关详细信息，请阅读 https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/TableView_iPhone/ManageInsertDeleteRow/ManageInsertDeleteRow.html

试试这个

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath*)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [tableView beginUpdates];
        NSManagedObject *managedObject = [_fetchedobj objectAtIndex:indexPath.row];
        [self.managedObjectContext deleteObject:managedObject];
        // insert this line to your code

        NSMutableArray *newA = [_fetchedobj mutableCopy ];
        [newA removeObjectAtIndex: indexPath.row];
        _fetchedobj = newA;

        [myTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
        [myTable endUpdates];
    }
}

从 Table 视图中删除行

Delete Row from Table view

core-data

uitableview

nsmanagedobject

ios