通过此属性可以设置/获取摄像机的自动焦点。仅在 **Android** 和 **iOS** 设备上有效。
Vector2.x 和 Vector2.y 分量是 0 到 1 范围内的相对值，原点 (0, 0) 位于纹理的左下角。
当前纹理正在播放时（在调用 WebCamTexture.Play 方法之后），可以设置此属性。设置新值后，设备摄像机会自动使用新的自动焦点来重新对焦。
重新对焦后，摄像机焦点将锁定。要禁用焦点并切换回连续自动对焦模式，autoFocusPoint 属性应
设置为 **null**。如果摄像机设备不支持此功能，或者当前无法对焦（例如因为之前的对焦尝试尚未完成），
则不会更改之前的焦点设置值。如果将此属性设置为 x 或 y 超出范围 0 到 1的值，那么会导致焦点重置为 null，
并且摄像机切换回连续自动对焦模式。
**注意：**前置摄像头设备可能不支持此功能。
另请参阅：WebCamDevice.isAutoFocusPointSupported。
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