驱动此 RectTransform 的值的对象。如果未驱动，则值为 null。
有时 RectTransform 的值可以由脚本驱动。如果是这种情况，则值在 Inspector 中不应是可编辑的，并且它们不应进行序列化。
当 RectTransform 的值由一个脚本驱动时，该脚本可以将 drivenByObject 值设置为自己，这样 RectTransform 便可阻止在 Inspector 中编辑这些值，并且阻止将这些值序列化。
如果这些值之前由脚本驱动，但是已不再驱动，则应将 drivenByObject 值重新设置为 null。
驱动 RectTransform 的值的脚本应始终设置所有值，而不仅仅是部分值；否则剩余值会是未定义的，也无法由用户编辑。
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