指示用户是否存在以及是否在与设备交互。
HMD 等许多 XR 设备都可以检测用户当前是否正穿戴着设备和/或与设备交互。此属性可用于测试此用户的交互状态。此属性的确切行为因各类设备而异 -- 一些设备会有专用于检测用户接近度的传感器;当用户移动时,如果该属性为 UserPresenceState.Present,则应用程序可以合理地推断出用户与设备在同一位置。
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