pulseView.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
pulseView.colors = @[(__bridge id)[UIColor whiteColor].CGColor,
                     (__bridge id)[UIColor blackColor].CGColor,
                     (__bridge id)[UIColor whiteColor].CGColor];
pulseView.locations = @[@(0.3),@(0.5),@(0.7)];
pulseView.startPoint = CGPointMake(0, 0.5);
pulseView.endPoint = CGPointMake(1, 0.5);

pulseView.minRadius = 0;
pulseView.maxRadius = 100;

pulseView.duration = 3;
pulseView.count = 6;
pulseView.lineWidth = 3.0f;

[pulseView startAnimation];