CODEWITHSUNDEEP
iosuitableviewtimer
sergtk
sergtk

Reputation: 10974

How to update UITableView cells when user swipe and see 'Delete' button?

I have UITableVIew table.

I implemented deleting in method tableView:commitEditingStyle:forRowAtIndexPath: of UITableViewDataSource Protocol.

All work fine here. Useful question on subject here Deleting table row with animation using core data .

But every cell shows timer which count down and I have issue with this.

I use NSTimer in following way:

timer = [NSTimer scheduledTimerWithTimeInterval:0.25 target:self
    selector:@selector(updateTickerHandler:) userInfo:nil repeats:YES];

...

- (void)updateTickerHandler:(NSTimer*)timer
{
    [tableView reloadData];
}

When user swipes to delete timer, button "Delete" disappear when [tableView reloadData]; called.

I want to implement updating timer count down values on table cells which allows user to use swipe with "Delete" smoothly.

How to achieve this?

Upvotes: 0

Views: 1190

Answers (2)

sergtk
sergtk

Reputation: 10974

I was not able to obtain working behaviour with the call:

[tableView reloadData];

The working solution is to update cell components manually and not to call [table reloadData]

Code of updateTickerHandler: could be updated in the following way:

- (void)updateTickerHandler:(NSTimer*)timer
{
    [tableView beginUpdates];


    // select visible cells only which we will update 
    NSArray *visibleIndices = [tableView indexPathsForVisibleRows];

    // iterate through visible cells
    for (NSIndexPath *visibleIndex in visibleIndices)
    {
        MyTableCell *cell = (MyTableCell*)
            [tableView cellForRowAtIndexPath:visibleIndex];

        // add here code to fill `cell` with actual values
        // visibleIndex can be used to retrieve corresponding data

        ...
    }

    [tableView endUpdates];
}

Upvotes: 3

hitesh
hitesh

Reputation: 374

 - (void)updateTickerHandler:(NSTimer*)timer
{
 [Table beginUpdates];
 [Table reloadData];
 [Table endUpdates];
}

Upvotes: 0

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