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    <p>I believe that Siri animation is made with CAEmitterLayer and CAEmitterCell and then animated with core animation, but I might be totally wrong. Here's some code that imitates the effect:</p> <pre><code>// create emitter layer self.emitterLayer = [CAEmitterLayer layer]; self.emitterLayer.frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height); self.emitterLayer.emitterMode = kCAEmitterLayerOutline; self.emitterLayer.emitterShape = kCAEmitterLayerLine; self.emitterLayer.renderMode = kCAEmitterLayerAdditive; [self.emitterLayer setEmitterSize:CGSizeMake(4, 4)]; // create the ball emitter cell CAEmitterCell *ball = [CAEmitterCell emitterCell]; ball.color = [[UIColor colorWithRed:111.0/255.0 green:80.0/255.0 blue:241.0/255.0 alpha:0.10] CGColor]; ball.contents = (id)[[UIImage imageNamed:@"ball.png"] CGImage]; // ball.png is simply an image of white circle [ball setName:@"ball"]; self.emitterLayer.emitterCells = [NSArray arrayWithObject:ball]; [self.view.layer addSublayer:self.emitterLayer]; float factor = 1.5; // you should play around with this value [self.emitterLayer setValue:[NSNumber numberWithInt:(factor * 500)] forKeyPath:@"emitterCells.ball.birthRate"]; [self.emitterLayer setValue:[NSNumber numberWithFloat:factor * 0.25] forKeyPath:@"emitterCells.ball.lifetime"]; [self.emitterLayer setValue:[NSNumber numberWithFloat:(factor * 0.15)] forKeyPath:@"emitterCells.ball.lifetimeRange"]; // animation code CAKeyframeAnimation* circularAnimation = [CAKeyframeAnimation animationWithKeyPath:@"emitterPosition"]; CGMutablePathRef path = CGPathCreateMutable(); CGRect pathRect = CGRectMake(0, 0, 200, 200); // define circle bounds with rectangle CGPathAddEllipseInRect(path, NULL, pathRect); circularAnimation.path = path; CGPathRelease(path); circularAnimation.duration = 2; circularAnimation.repeatDuration = 0; circularAnimation.repeatCount = 3; circularAnimation.calculationMode = kCAAnimationPaced; [self.emitterLayer addAnimation:circularAnimation forKey:@"circularAnimation"]; </code></pre> <p>CAEmitterCell and CAEmitterLayer classes have many properties so check out the docs for more.</p>
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    1. PORecreate Siri Button Glow Animation
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    1. COself.fireEmitter is missing the context here
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    2. COI've forgot to edit those lines when copying code. It should have been self.emitterLayer. I've fixed it.
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    3. COYou forgot to mention that "ball.png" should be around 5x5 pixels...
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