[chicken_tastes_good]

I've been reading on eventLoops and still don't understand how I can start/stop an "infinite" loop via one (or two) NSButtons.

I have my action that a "Start" button is attached to, and in it I can change "Start" to "Stop". I could, at this time, start the loop, but I want to be able to click "Stop" to (naturally) stop the loop.

I could use NSTimer to run the loop (as opposed to using two threads) but how do I exit this Action when the "Stop" button is clicked?

[chicken_tastes_good]

I just found this at
http://www.omnigroup.com/mailman/arc...er/004964.html


<quote>
- (void)startNSButton *)sender
{
if (!_timer) {
[sender setTitle:@"Stop"];
[sender setAction:@selector(stop];
_timer = [[NSTimer scheduledTimerWithTimerInterval:30 target:self
selector:@selector(timerFired) userInfo:nil repeats:YES] retain];
}
}

- (void)stopNSButton *)sender
{
if (_timer) {
[sender setTitle:@"Start"];
[sender setAction:@selector(start];
[_timer release];
_timer = nil;
}
}
</quote>

Is that what I'm looking for?

[DaGuy]

I'm not exactly sure about your needs but below is some code that works for me in a perhaps closely related situation:

Code:
//  
//From the controlling class, you could implement the following two methods.

// Before your UI is available to the user, this method is triggered automatically
- (void) awakeFromNib
{
    startStopFlag = YES;
}

// the is action is the associated with an NSButton
- (IBAction)toggleOnOff: (id)sender
{
    if(startStopFlag){
        [viewOutlet start];
        [OnOffButton setTitle:@"Stop"];
        startStopFlag = NO;
    }else{
        [viewOutlet stop];
        [OnOffButton setTitle:@"Start"];
        startStopFlag = YES;
    }
}

// Here's what the target methods look like.
// ViewOutlet is an outlet to a class that responds to "start" and "stop" messages.

- (void) start
{
    
    // Startup the main timer
   NSTimer *mainTimer = [NSTimer scheduledTimerWithTimeInterval: 1.0 
            target:self 
            selector:@selector(theMethodThatWillBeCalledByThisTimer) 
            userInfo:nil
            repeats:YES];
}

- (void) stop
{
    [mainTimer invalidate];
}

The timer will fire until infinity unless the user press the on/off button.

Now that I look at your prior post, I think my code does exactly the same thing. Heck of way to double post!



The only significant differnces relate to garbage collection efforts -which is evident in their code.