tableview won't update after adding objects to an array

Question

I have a tableview inside a popover in my main view which is a web browser. Whenever the user visits a web page I want it to add the page to a list of recently visited websites. I have the code set up to add the URL as a string to the array that is the data source for the table view. The table view only shows the first site visited and won't show anything past that. However I know the sites are being added to the array because the array shows the Sites using NSLog statements after being added. However they still won't show up in the table. Can anyone help me?

EDIT:

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    // Return the number of rows in the section.
    return [recentlyVisitedUrls count];
}

Are you calling [tableView reloadData]?

Patrick Hernandez
– Patrick Hernandez

2012-01-13 21:12:46 +00:00
Commented Jan 13, 2012 at 21:12 — Patrick Hernandez
– Patrick Hernandez, Commented Jan 13, 2012 at 21:12
Yes but it deletes data that was there previously

Slayter
– Slayter

2012-01-13 22:06:26 +00:00
Commented Jan 13, 2012 at 22:06 — Slayter
– Slayter, Commented Jan 13, 2012 at 22:06

jonkroll · Accepted Answer · 2012-01-13 21:17:03Z

2

Also make sure you are returning the correct length of your array from – tableView:numberOfRowsInSection:

answered Jan 13, 2012 at 21:17

jonkroll

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Comments

Jim · Accepted Answer · 2012-01-13 21:13:09Z

2

Try

[tableView reloadTable];

after you add the new data.

answered Jan 13, 2012 at 21:13

Jim

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3 Comments

Slayter Over a year ago

when i do this i have to put it before the data is added and it comes up as [tableView reloadData]; also data that was there before disappears

Jim Over a year ago

Show your delegate methods for numberOfSectionsInTableView:, numberOfRowsInSection: and cellForRowAtIndexPath:. Put in your original question for formatting purposes.

Slayter Over a year ago

ive fixed it. i had to reload the data again after updating the numberOfRowsInSection:

OdNairy · Accepted Answer · 2012-01-13 21:53:10Z

0

If you wan't animated updating, you can call:

[self.tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO]

If you need animation, it will be better read: Table View Programming Guide for iOS, you need Batch insert… part.

answered Jan 13, 2012 at 21:53

OdNairy

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Comments

Aaron Hayman · Accepted Answer · 2012-01-14 00:14:35Z

If you have a large table, [tableView reloadData] is probably not ideal. It'll also will reset your view to the beginning of the table, which may or may not be desirable. You might try something like this:

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:_model.recordCount - 1 inSection:0];
[_tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationRight];
[_tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:NO];

BTW, _model is the data delegate class for the table in the example.

Also, make sure the data delegate updates it's total count correctly before you insert, or your app will crash on the insertRowsAtIndexPaths.

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