| edge | 要相对于其进行内嵌的父矩形边缘。 |
| inset | 内嵌距离。 |
| size | 矩形在内嵌相同方向上的大小。 |
设置此矩形相对于父矩形指定边缘的距离，同时也会设置其大小。
调用此方法可同时设置锚点 anchoredPosition 和 sizeDelta，不过只会设置水平或垂直分量（具体取决于为内嵌指定的边缘）。
该方法在对布局行为编写脚本时可能会特别有用，因为通过它可简单地指定相对于父边缘的位置，而无需考虑锚定功能。
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