Sample Gist 1

gistfile1.m

- (void)updateCarPosition
{
	CGFloat sliderPercent = self.slider.value;

	CGFloat carX = [QuadraticEasing easeInOutValueAtPercent:sliderPercent
													   from:self.carImageMinX
														 to:self.carImageMaxX];

	self.carImage.center = CGPointMake(carX, self.carImageY);
}