在子项的位置更改时执行的回调。
onValueChanged 用于监视 ScrollRect 对象中的更改。 onValueChanged 调用将使用 UnityEvent.AddListener API 来监视 更改。发生更改时，将调用用户提供的脚本代码。 ScrollRect.onValueChanged 的 UnityEvent.AddListener API 要求一个 Vector2 参数。\ \ **注意：**编辑器允许手动设置 onValueChanged 值。例如， 可将该值设置为仅在运行时运行。此处还提供要调用的 对象和脚本函数。\ \ 也可以选择在运行时设置 onValueChanged 变量。下面的脚本示例 演示如何执行此操作。将脚本附加至 ScrollRect 对象。
no example available in C#
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