POPSpringAnimation *popAna = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPosition];popAna.springBounciness = 10;popAna.springSpeed = 10;popAna.toValue = [NSValue valueWithCGPoint:CGPointMake(self.width/2, self.height/2 - 100)];

 

POPSpringAnimation *sprintAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewScaleXY];sprintAnimation.toValue = [NSValue valueWithCGPoint:CGPointMake(1.0, 1.0)];sprintAnimation.velocity = [NSValue valueWithCGPoint:CGPointMake(1.6, 1.6)];sprintAnimation.springBounciness = 10.f;