如何更新tableView中的数据？

Question

I initialize data in my table with an array in viewDidLoad and then add the data to the cell. This a standard way of doing it that I read in a book. This is what I have:

- (void)viewDidLoad {
    [super viewDidLoad];
    //Create array and add data ("tableViewValues" is initialized in .h file)
    tableViewValues = [[NSMutableArray alloc]init];
    [tableViewValues addObject:@"$280,000.00"];
    [tableViewValues addObject:@"$279,318.79"];
}

// Customize the appearance of table view cells.
- (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] autorelease];
    }

    NSString *cellValue = [tableViewValues objectAtIndex:indexPath.row];

    cell.textLabel.text = cellValue;

    return cell;
}

So when the view loads, those two currency values are in my table. Now in another function, I populate a another array with different currency numbers depending on what the user enter in a textfield. How would I update my current table view and replace those values with the values in my other array? Can anyone help me? Thanks!

Answer 1

You can call

[self.tableView reloadData];

to reload all data, however, you will need to program a way to have the array that you want populate the table. Maybe you want your -cellForRowAtIndexPath to call a private method that conditionally picks the correct array.

Answer 2

You have to remove all values from your array then you have to call table reload data

// In the method where you will get new values
[tableViewValues removeAllObjects];  
[tableViewValues add:@"new values"];  
 //reload table view with new values
[self.tableView reloadData];

Answer 3

I've had this problem many times and I always make the same mistake.

[self._tableview reloadData] works!

The question is the place where you populate the table.

I did it in -(void)viewDidLoad and the table was updated with the same data . Apparently nothing happens.

Update the content of your table view (plist, dictionary, array, whatever) in the same place where you call [self._tableview reloadData], just before.

THAT IS THE KEY!!!

Do a test:

#pragma mark - Actions

- (IBAction)refreshParams:(id)sender {

   self.dictionary = nil;

   [self._tableView reloadData];
}

You can see how disappear the tableview content when you push the refresh button. Obviously, this is an example. I use a dictionary to populate the table and a button to refresh the content.

Answer 4

in that function, after assigning values to the new array, all you have to do is

 [tableViewValues removeAllObjects];
 tableViewValues = [[NSMutableArray alloc] arrayByAddingObjectsFromArray:newArray];
 [self.tableView reloadData];

Answer 5

You'd need to (release and) recreate same tableViewValues array and then call reloadData method on tableView like this:

[self.tableView reloadData];

This will work if you're on table view controller and self.tableView points to the table in question.

Answer 6

[self.tableView reloadData];

会帮助你。

Answer 7

In Swift,

tableView.reloadData() or self.tableView.reloadData() , where tableView is a property in your ViewController.