| axis | 指定尺寸的轴。 |
| size | 指定轴的期望值。 |
让 RectTransform 计算出的矩形在指定轴上达到给定尺寸。
此方法使用当前锚点生成给定的尺寸。如果父级 RectTransform 更改大小，其矩形尺寸可能发生变化。如果希望尺寸保持不变，则要么将 RectTransform 锚点设置为不可拉伸，要么在父级尺寸发生变化时再次调用此方法。
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