| pointerEvent | 与触摸事件相关的事件数据，例如，要传递给触摸事件目标对象的位置和 ID。 |
| pressed | 对于触摸事件的第一帧，该参数为 true，对于之后的帧，则为 false。因此，这可用于确定触摸事件发生的瞬间。 |
| released | 仅对于触摸事件的最后一帧，该参数为 true。 |
每当处理触摸事件时，Unity 都会调用此方法。使用自定义实现重载此方法，以自行处理触摸事件。
此方法可在派生的类中重载，以更改触摸按下事件的处理方式。
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