NSTimer

[kohtenko]

Hi, NSTimer in your control is never stops and because of that object never released. Actually, I think you don't even need NSTimer. Try this for smooth rotation:

define RADIANS(degrees) ((degrees * M_PI) / 180.0)

• (void)startAnimating {
  [self.activityImageView.layer removeAnimationForKey:@"ROTATE_ANIMATION"];
  CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
  animation.duration = 0.1;
  animation.cumulative = YES;
  animation.repeatCount = NSIntegerMax;
  animation.toValue = @(M_2_PI);
  animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
  animation.removedOnCompletion = NO;

  [self.activityImageView.layer addAnimation:animation forKey:@"ROTATE_ANIMATION"];

  self.hidden = NO;
  }

• (void)stopAnimating {
  [self.activityImageView.layer removeAnimationForKey:@"ROTATE_ANIMATION"];
  }