using CADisplayLink

gistfile1.m

- (void)startAnimating
{
  if(self.displayLink)
    return;

  self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(tick:)];
  [self.displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}

- (void)stopAnimating
{
  [self.displayLink invalidate];
  self.displayLink = nil;
}

- (void)tick:(CADisplayLink *)displayLink
{
}

- (void)dealloc
{
  [self stopAnimating];
  [super dealloc];
}