本文详细解释了CALayer中anchorPoint属性与transform属性的作用，展示如何使用它们来精确控制层的位置、旋转、缩放等效果，特别强调默认情况下锚点位于层中心导致的视觉变化。
CALayer的anchorPoint属性与transform属性
When you apply a transform to a layer, the transform uses the anchor point to determine where to rotate, scale, and so on.
With the examples so far, the scale transform causes the layer to appear to shrink into the middle of the window. This is because the default position of the anchor point of any layer is the center.
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