Question

I am having table view in my iPhone application. The requirement is that I have to use gestures for that table view so that when user tap+hold on a row then a dialogue box should come up confirming user to save the data of that specific row to iPhone core data or nsuserdefaults.

I want to know that what option would be the best to save the data i.e., core data or nsuserdefaults?

And the most important How can I achieve it?

I need any example or code snippet to get accomplish this…

thanx

Answer 1

I would go for NSUserDefault if I am sure that will be no more than 10-20 rows of data, otherwise I would go for CoreData so it can be scaled in the future. I would use the LongPressGestureRecognizer in the cell to get the indexPath of the cell and display the dialog as shown in sample code below.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{ 
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        UILongPressGestureRecognizer *pressRecongnizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(tableCellPressed:)];
            pressRecongnizer.minimumPressDuration = 0.5f;
            [cell addGestureRecognizer:pressRecongnizer];
            [pressRecongnizer release];
    }
    // your cell info
    cell.textLabel.text = @"test";
    return cell;
} 

- (void)tableCellPressed:(UILongPressGestureRecognizer *)recognizer
{
    // You can access to the tableview cell from the recognizer.view
    // You can get the data directly from the cell data more or label and etc.
    UITableViewCell *cell = (UITableViewCell *)recognizer.view;

    // You can either get the NSIndexPath of the cell from the tableview to 
    // access the data model from you data collection.
    NSIndexPath *indexPath = [self.tableview indexPathForCell:cell]

    // Use the index path to get data and display dialog.
    // For example:
    UIAlertView *alert = [UIAlertView alloc] – initWithTitle:@"table cell pressed" message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
}