| axis | 用于指定大小的轴。 |
| size | 指定轴上的所需大小。 |
使 RectTransform 计算的矩形在指定轴上具有给定大小。
此方法可使用当前锚定生成给定大小。如果父 RectTransform 更改大小，则矩形的大小可能会更改。如果打算保持大小，则 RectTransform 锚点应设置为不拉伸，或是每当父大小更改时都再次调用此方法。
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