Is rippleEffect private Api? IOS

Question

just as the title. Is rippleEffect the type of CATransition private api?

CATransition * canimation = [CATransition animation];
[canimation setDelegate:self];
[canimation setDuration:0.5];
canimation.timingFunction = UIViewAnimationCurveEaseInOut;
canimation.fillMode = kCAFillModeBackwards;
canimation.removedOnCompletion = NO;
[canimation setType:@"rippleEffect"];
[card.layer addAnimation:canimation forKey:@"animation"];

Answer 1

Yes, it's private. If it were public, there would be a constant defined for it in a QuartzCore header file, named something like kCATransitionRipple. No constant = not public.