How to Draw and animate the wifi signal pulse - ios

Question

i want to draw an wifi signal pulse and want to animate with that in launch screen. i tried with this code. the signal is showing in the down words but i need to show in up words. Starting from a point ti increase [like our phone wifi signal]
- (void)viewDidLoad
{
[super viewDidLoad];
[self addWavesToView];
[self addAnimationsToLayers];
}
- (void)addWavesToView
{
CGRect rect = CGRectMake(0.0f, 0.0f, 300.0f, 300.0f);
UIBezierPath *circlePath = [UIBezierPath
bezierPathWithOvalInRect:rect];
for (NSInteger i = 0; i < 10; ++i) {
CAShapeLayer *waveLayer = [CAShapeLayer layer];
waveLayer.bounds = rect;
waveLayer.position = CGPointMake(100, 100);
waveLayer.strokeColor = [[UIColor lightGrayColor] CGColor];
waveLayer.fillColor = [[UIColor clearColor] CGColor];
waveLayer.lineWidth = 5.0f;
waveLayer.path = circlePath.CGPath;
waveLayer.transform = CATransform3DMakeTranslation(0.0f, i*25, 0.0f);
waveLayer.strokeStart = 0.25- ((i+1) * 0.01f);
waveLayer.strokeEnd = 0.25+((i+1) * 0.01f);
[self.view.layer addSublayer:waveLayer];
}
}
- (void)addAnimationsToLayers
{
NSInteger timeOffset = 10;
for (CALayer *layer in self.view.layer.sublayers) {
CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:#"strokeColor"];
animation.duration = 10.0f;
// Stagger the animations so they don't begin until the
// desired time in each
animation.timeOffset = timeOffset--;
animation.toValue = (id)[[UIColor lightGrayColor] CGColor];
animation.fromValue = (id)[[UIColor darkGrayColor] CGColor];
// Repeat forever
animation.repeatCount = HUGE_VALF;
// Run it at 10x. You can adjust this to taste.
animation.speed = 10;
// Add to the layer to start the animation
[layer addAnimation:animation forKey:#"strokeColor"];
}

Answer 1

"show in up words", it'll take more time so we can rotate base view to 180 degree by this code inside of viewDidLoad() Function
CGFloat degreesOfRotation = 180.0;
self.view.transform = CGAffineTransformRotate(self.view.transform,
degreesOfRotation * M_PI/180.0);