how to clear all the rows of uitableview

Question

I added a button on the uinavigationbar I want to use it to clear all the rows of uitablview

How can I do that?

Please clarify what you mean by "clear all the rows". – hennes Mar 13 '11 at 18:27 — hennes, Mar 13 '11 at 18:27
It means that delete all contents from table view – Praphin SP Feb 07 '14 at 07:20 — Praphin SP, Feb 07 '14 at 07:20

score 12 · Answer 1 · answered Jan 27 '12 at 11:11

A bit late... but try this:

Where you want to clear the table:

// clear table
clearTable = YES;
[table reloadData];
clearTable = NO;

This function should look like:

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

    if(clearTable)
        return 0;

    (...)
}

score 2 · Answer 2 · answered Mar 13 '11 at 18:03

There should be a UITableView delegate method that populates the UITableView control:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

Find this method and change where the data for each cell is being pulled from. If you are currently using the indexPath to access an array of values to populate your tableView cells, you can programmatically switch to an array of empty values, or even just return empty cells from this method when the condition is right.

And he also needs to call reloadData on the table view. – hennes Mar 13 '11 at 18:26 — hennes, Mar 13 '11 at 18:26

score 2 · Answer 3 · answered Aug 11 '11 at 01:02

2

Simple.. set your data source (NSArray or NSDictionary) to nil and [self.tableView reloadData]!

answered Aug 11 '11 at 01:02

REALFREE

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wouldn't that just remove the array and where as the objects will still exist ? if Yes, then it is not a good solution as it creates memory leaks... Instead you should try NSMutableArray *arrayThatYouCanRemoveObjects = [NSMutableArray arrayWithArray:your_array]; [arrayThatYouCanRemoveObjects removeObjectAtIndex:your_object_index]; [your_array release]; your_array = [[NSArray arrayWithArray: arrayThatYouCanRemoveObjects] retain]; copied from http://stackoverflow.com/questions/1728475/nsarray-remove-item-from-array – yunas Jan 03 '12 at 11:40

score 1 · Answer 4 · answered Mar 28 '15 at 00:07

1

Before you are reloading the table remove all objects from your tableView array (The array which populated your tableView) like so:

[myArray removeAllObjects];
[tableView reloadData];

answered Mar 28 '15 at 00:07

Waqleh

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Basel · Answer 5 · 2011-03-13T18:02:39.113

1

What do you exactly mean by clearing the row? Do you still want them to be there, but without text? If yes, here's this code:

   UITableViewCell *cell;

    NSIndexPath *index;

        for (int i = 0 ; i < count; i++) {
            index = [NSIndexPath indexPathForRow:i inSection:0];
            cell = [tableView cellForRowAtIndexPath:index];
            cell.textLabel.text = @"";
        }

If you want to delete them, you can use this code:

[uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index] withRowAnimation:UITableViewRowAnimationFade];

edited Mar 13 '11 at 18:02

answered Mar 13 '11 at 17:52

Basel

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in for loop I increment and use: index = [NSIndexPath indexPathForRow:i inSection:0];;[uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index] withRowAnimation:UITableViewRowAnimationFade]; but after the seccont iteration it crash – Ali Mar 14 '11 at 08:28
I think that you're looping from 0 incrementally. Try the opposite as follows: for (i = [uiTable numberOfRowsInSection:0] - 1; i >=0 ; i--){ NSIndexPath *index = [NSIndexPath indexPathForRow:i inSection:0]; [uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index] withRowAnimation:UITableViewRowAnimationFade]; } – Basel Mar 14 '11 at 08:35
the same error , I tried your comment but the same error appeared – Ali Mar 14 '11 at 09:04

score 0 · Answer 6 · edited Oct 14 '17 at 22:18

0

The rowcount = i should go before the call.

[uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index]
withRowAnimation:UITableViewRowAnimationFade];

Otherwise, it will crash.

edited Oct 14 '17 at 22:18

Dima Kozhevin

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answered Oct 14 '17 at 19:27

Jim D

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score 0 · Answer 7 · answered Jul 16 '20 at 14:14

0

tableView.dataSource = nil
tableView.reloadData()

answered Jul 16 '20 at 14:14

Haiyuan

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score 0 · Answer 8 · answered Aug 11 '11 at 00:52

The crash is occurring because you need to reset number if rows count in the -

-(NSInteger)tableView:(UITableView *)tableView 
 numberOfRowsInSection:(NSInteger)section
{
    return [tempArray count];
}

one way is use a flag variable as below:

-(NSInteger)tableView:(UITableView *)tableView 
 numberOfRowsInSection:(NSInteger)section
{
   if (deleting)
      return rowcount;
   else
       return [tempArray count];
}

Also you need to modify the deleting code as below:

    deleting = YES;
    for (i = [uiTable numberOfRowsInSection:0] - 1; i >=0 ; i--)
    { 
    NSIndexPath *index = [NSIndexPath indexPathForRow:i inSection:0]; 
    [uiTable deleteRowsAtIndexPaths:[NSArray arrayWithObject:index] withRowAnimation:UITableViewRowAnimationFade]; 

     rowcount = i;
    } 

    deleting = NO;
    [uiTable reloadData];

in your .h file

BOOL deleting;
NSInteger  rowcount;

Hope this helps...

how to clear all the rows of uitableview

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