Get current CAAnimation transform value

Question

I want to access get the value of the transform scale at a point in time. Here is the animation creation :

    CABasicAnimation *grow = [CABasicAnimation ani         


        

Answer 1

Swift 5: The nicest answer, in a function from Hacking With Swift

func scale(from transform: CGAffineTransform) -> Double {
    return sqrt(Double(transform.a * transform.a + transform.c * transform.c))
}