CODEWITHSUNDEEP
iosuitableviewsdkinsert
Kingsley Sendze
Kingsley Sendze

Reputation: 55

reorder cells in UItableView and insert (new order) into database

I have a table populated by an NSMutableArray. The user has the ability to reorder the cells (rows) how they want. I want to insert the records into the database from the array inheriting the reordered sequence.

So say the table loaded: row 1 row 2 row 3 row 4

And the user reorders to: row 4 row 2 row 1 row 3

I want to push the data to the database with the reordered sequence. However when I insert all four rows via looping after reordering the rows via UITableView, the order goes into the database with the original order (not the rearranged order).

Is there a way to refresh the array from the reordered table?

Upvotes: 2

Views: 627

Answers (2)

cahn
cahn

Reputation: 1369

Your records should have an 'order' field and store it to database. When loading from database you should sort the records with the field.

EDIT: the code below illustrates the idea

- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath {
    if (destinationIndexPath.row > sourceIndexPath.row) {
        for (NSInteger row = sourceIndexPath.row + 1; row <= destinationIndexPath.row; ++row) {
            Record* record = array[row];
            record.row = [NSNumber numberWithInt:record.row.intValue - 1];
        }
    } else if (destinationIndexPath.row < sourceIndexPath.row) {
        for (NSInteger row = destinationIndexPath.row; row < sourceIndexPath.row; ++row) {
            Record* record = array[row];
            record.row = [NSNumber numberWithInt:record.row.intValue + 1];
        }
    }
    Record* record = array[sourceIndexPath.row];
    record.row = [NSNumber numberWithInt:destinationIndexPath.row];
    [array removeObjectAtIndex:sourceIndexPath.row];
    [array insertObject:record atIndex:destinationIndexPath.row];
    [self save];
}

- (void)loadFromCoreData {
    NSFetchRequest* request = [[NSFetchRequest alloc] init];
    NSEntityDescription* entity = [NSEntityDescription entityForName:@"Record" inManagedObjectContext:_managedObjectContext];
    request.entity = entity;

    NSSortDescriptor* sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"row" ascending:YES];
    NSArray* sortDescriptors = [NSArray arrayWithObject:sortDescriptor];
    request.sortDescriptors = sortDescriptors;

    NSError* error;
    array = [[_managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
}

Upvotes: 2

ahmedalkaff
ahmedalkaff

Reputation: 313

I think a better way is to store the row number as a field along with other cell data. This way whenever you want to show the data again you have the row number to construct user's order.

Upvotes: 0

Related Questions