实用函数，用于查询布局元素的最小大小、首选大小和灵活大小。
另请参阅：Auto Layout。
| GetFlexibleHeight | 返回布局元素的灵活高度。 |
| GetFlexibleSize | 返回布局元素的灵活大小。 |
| GetFlexibleWidth | 返回布局元素的灵活宽度。 |
| GetLayoutProperty | 获取具有给定 RectTransform 的布局元素的计算的布局属性。 |
| GetMinHeight | 返回布局元素的最小高度。 |
| GetMinSize | 返回布局元素的最小大小。 |
| GetMinWidth | 返回布局元素的最小宽度。 |
| GetPreferredHeight | 返回布局元素的首选高度。 |
| GetPreferredSize | 返回布局元素的首选大小。 |
| GetPreferredWidth | 返回布局元素的首选宽度。 |
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