NSScrollView - scrollViewDidBeginScrolling & scrollViewDidEndScrolling

gistfile1.m

// When you init your view
[NSNotificationCenter.defaultCenter addObserver:self selector:@selector(scrollViewDidScroll:) name:NSViewBoundsDidChangeNotification object:scrollView.contentView];


// The methods
- (void)scrollViewDidBeginScrolling
{
    // Do stuff
}

- (void)scrollViewDidScroll:(NSNotification*)notification 
{
    if(scrollTimer == nil)
        [self scrollViewDidBeginScrolling];
    
    // Do stuff
    
    if (scrollTimer != nil && [scrollTimer isValid]) 
        [scrollTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:0.1]];
    else 
        scrollTimer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(scrollViewDidEndScrolling) userInfo:nil repeats:NO];
}

- (void)scrollViewDidEndScrolling
{
    // Do stuff
    
    if(scrollTimer != nil)
        scrollTimer = nil;
}