NSTimer in sheet window not firing

Question

I have a timer within a panel that I am trying to get to fire every second, however I cannot seem to get it to fire. I am creating my panel like so:

// Begin our sheet
[NSApp beginSheet: targetController.window
   modalForWindow: self.window
    modalDelegate: self
   didEndSelector: nil
      contextInfo: nil];

Then in my targetController I have the following:

- (void) awakeFromNib
{
    NSLog(@"awakeFromNib.");
    displayUpdateTimer = [NSTimer timerWithTimeInterval: 1.0
                                                 target: self
                                               selector: @selector(updateDisplay:)
                                               userInfo: nil
                                                repeats: TRUE];

    [[NSRunLoop currentRunLoop] addTimer: displayUpdateTimer
                                 forMode: NSModalPanelRunLoopMode];
}

My understanding is that I am doing this correctly by adding the timer with the NSModalPanelRunLoopMode, however even doing so, my updateDisplay: selector never gets fired.

Does anyone have any ideas on what I am doing wrong here?

Note: I have also tried NSDefaultRunLoopMode but it made no difference. The timer was still not fired.

Edit: My overall goal is the following -

My panel has a table view that can have many items added to it at one time (from multiple threads). So I add the items into a temporary array, then when the timer fires, it adds items from the temporary array to the main array and reloads the table. Below is samples of the code doing this:

- (void) addOverwriteObject: (id) overwriteObject
{
    @synchronized(newObjects)
    {
        // Add our overwrite object
        [newObjects addObject: overwriteObject];
    } // End of overwriteObject
} // End of addOverwriteObject

And the method that fires when the timer updates:

- (void)updateDisplay:(id)sender
{
    @synchronized(newObjects)
    {
        if(newObjects.count > 0)
        {
            [overwriteObjects addObjectsFromArray: newObjects];
            [newObjects removeAllObjects];

            [tableView reloadData];
        } // End of newObjects has entries
    } // End of newObjects sync
} // End of updateDisplay

Unfortunately without the timer firing, I get no entries in the table at all.

Below is a screenshot of exactly what I am trying to do (entries have been added directly to the main array.)

Answer 1

Your code seems to be correct,there might be the issue with run loop.Try using scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:.