我正在尝试为圆角矩形的宽度设置动画，问题是当从较大的宽度变为较窄的宽度时，动画会出现“像差缓和跳跃”。代码如下:shapeLayer=[CAShapeLayerlayer];shapeRect=CGRectMake(0.0f,0.0f,150.0f,200.0f);[shapeLayersetBounds:shapeRect];[shapeLayersetPosition:CGPointMake(iniPosX,80.0f)];[shapeLayersetFillColor:[[UIColorblackColor]CGColor]];[shapeLayersetStrokeColor: