iphone - 円形パスで uibutton をアニメーション化する方法 (Objective C)

Question

float degrees = -30.0;
float radians = (degrees/180.0) * M_PI;

[UIView animateWithDuration:0.5 animations:^
 {
     bottomRoundedView.transform = CGAffineTransformMakeRotation(radians);
 }
 ];