虚幻4 几个常用属性说明及不同之处

刚开始看这几个属性的时候，因为有些描述不太明确，我也被官方的文档说懵了。在自己做了一些实验后才理清了一些词语的不同。

下面所谓的Blueprint只表示蓝图节点而不表示蓝图资源的属性窗口；archetypes是指蓝图资源，instances是指蓝图实例（比如把一个蓝图拖动到场景就变成一个实例）。Anywhere是相对蓝图资源和蓝图实例来说的，并不包括蓝图节点。

BlueprintReadWrite：This property can be read or written from a Blueprint. This operator is incompatible with the BlueprintReadOnly specifier.

BlueprintReadWrite：在蓝图（节点）里面可以读写（get和set方法）。

BlueprintReadOnly：This property can be read by Blueprints, but not modified. This operator is incompatible with the BlueprintReadWrite specifier.

BlueprintReadOnly：在蓝图（节点）里面只读。

EditAnywhere：Indicates that this property can be edited by property windows, on archetypes and instances.

EditAnywhere：在资源和实例的属性窗口都可以编辑。与Visible*标识符冲突。

EditDefaultsOnly：Indicates that this property can be edited by property windows, but only on archetypes. This operator is incompatible with the Visible* specifiers.

EditDefaultsOnly：只能在资源的属性窗口编辑。与Visible*标识符冲突。

EditInstanceOnly：Indicates that this property can be edited by property windows, but only on instances, not on archetypes. This operator is incompatible with the Visible* specifiers.

EditDefaultsOnly：只能在实例的属性窗口编辑。与Visible*标识符冲突。

VisibleAnywhere：Indicates that this property is visible in property windows, but cannot be edited at all. This operator is incompatible with the Edit* specifiers.

VisibleAnywhere：在资源和实例的属性窗口可视，但不可编辑。与Edit*冲突。

VisibleDefaultsOnly：Indicates that this property is only visible in property windows for archetypes, and cannot be edited. This operator is incompatible with the Edit* specifiers.

VisibleDefaultsOnly：在资源的属性窗口可视，但不可编辑。与Edit*冲突。

VisibleInstanceOnly：Indicates that this property is only visible in property windows for instances, not for archetypes, and cannot be edited. This operator is incompatible with the Edit* specifiers.

VisibleDefaultsOnly：在实例的属性窗口可视，但不可编辑。与Edit*冲突。