有和。onValueChanged
_ 不知道您使用的是哪一个,但这里是注册 事件的示例代码。您可以在此处找到其他 UI 事件示例。将对其进行修改以包含此答案中的示例。Scrollbar
ScrollRect
onValueChanged
您可能需要Scrollbar
. 获取原始值,然后在滚动时将其与当前值进行比较。您可以使用它来确定上下。这假定direction
设置为TopToBottom
。
scrollBar.direction = Scrollbar.Direction.TopToBottom;
滚动条:
public Scrollbar scrollBar;
float lastValue = 0;
void OnEnable()
{
//Subscribe to the Scrollbar event
scrollBar.onValueChanged.AddListener(scrollbarCallBack);
lastValue = scrollBar.value;
}
//Will be called when Scrollbar changes
void scrollbarCallBack(float value)
{
if (lastValue > value)
{
UnityEngine.Debug.Log("Scrolling UP: " + value);
}
else
{
UnityEngine.Debug.Log("Scrolling DOWN: " + value);
}
lastValue = value;
}
void OnDisable()
{
//Un-Subscribe To Scrollbar Event
scrollBar.onValueChanged.RemoveListener(scrollbarCallBack);
}
滚动矩形:
public ScrollRect scrollRect;
void OnEnable()
{
//Subscribe to the ScrollRect event
scrollRect.onValueChanged.AddListener(scrollRectCallBack);
}
//Will be called when ScrollRect changes
void scrollRectCallBack(Vector2 value)
{
Debug.Log("ScrollRect Changed: " + value);
}
void OnDisable()
{
//Un-Subscribe To ScrollRect Event
scrollRect.onValueChanged.RemoveListener(scrollRectCallBack);
}