如何使UIButton动画化(移动)，使其在移动过程中保持可触性?

It seems that when you animate a UIButton, the real button is always at the destination position. Animation is just a "movie". In this code, while in the animation, the button gets the event only if i touch the empty final destination (centered at 600x900). If I touch it as i see it in the showing position, meaning at some point where the button is being drawn (in the middle of the animation) it gets nothing.It seems that when you animate a UIButton, the