在iPhone应用程序中，您将如何为UIView的形状设置动画，例如从矩形变为圆形？我试过:CABasicAnimation*animation=[CABasicAnimationanimationWithKeyPath:@"path"];animation.duration=20.0;animation.timingFunction=[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];animation.fromValue=(__bridge_transferid)aPath;anim