4.构建 Grab 事件

在这步中，我们将覆盖 GrenadeGunPistol 上的 Grab 事件，以便确定枪和物体发生碰撞时是否会发生爆炸。
步骤

在事件图表中 点击右键 并搜索 Begin Primary Grab。选择 Event Begin Primary Grab 将节点添加到事件图表。
为以下节点重复此操作：
- Event Begin Secondary Grab
- Event End Primary Grab
- Event End Secondary Grab
对每个这些事件节点而言，都需要在父蓝图中调用相同事件，以确保现有功能仍在执行。右键点击 刚创建的 4 个事件节点并选择 Add call to parent function 即可执行此操作。
将事件节点连接到其 Parent 节点。
点击 My Blueprint 面板中 Variables 旁的 + 按钮新建一个变量并将其命名为 bCanExplode。

如尚未在虚幻编辑器的此会话中创建一个新变量，它将自动成为一个布尔（红色图标说明这是一个布尔）。如果需要修改，在 My Blueprint 标签中选中变量，则可在 Details 面板中进行修改。
点击并拖动 bCanExplode 变量到 事件图表 中，并选择 Set 选项。
使用 Ctrl + W 组合键复制 Set Can Explode 节点，点击新节点中的勾选框将 bCanExplode 的值设为 True。
最后，按下图所示将 Parent 节点连接到相应的 Set Can Explode 节点。
Copy Node Graph
image alt text
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    CustomProperties Pin (PinId=E0F4A52E424426C37B5EF98C8FFAF121,PinName="then",Direction="EGPD_Output",PinType.PinCategory="exec",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)

    CustomProperties Pin (PinId=DAB7D07A426D67E49C8D63A7911BFC1B,PinName="bCanExplode",PinType.PinCategory="bool",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,DefaultValue="true",AutogeneratedDefaultValue="false",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)

    CustomProperties Pin (PinId=26DA759E42C15E427748F283E9F317CC,PinName="Output_Get",PinToolTip="Retrieves the value of the variable, can use instead of a separate Get node",Direction="EGPD_Output",PinType.PinCategory="bool",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,DefaultValue="false",AutogeneratedDefaultValue="false",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)

    CustomProperties Pin (PinId=93A90B8F461C1A8D79FF37B7F054C5F3,PinName="self",PinFriendlyName=NSLOCTEXT("K2Node", "Target", "Target"),PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=BlueprintGeneratedClass'/GrenadeGun/Blueprints/Weapons/GrenadeGunPistol.GrenadeGunPistol_C',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.bIsMap=False,PinType.bIsSet=False,PinType.bIsArray=False,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PersistentGuid=00000000000000000000000000000000,bHidden=True,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,)

End Object
点击此图左上角的图标复制蓝图图表并将其粘贴到项目中。
在蓝图编辑器工具栏中，点击 Compile 更新更新蓝图并点击 Save 保存修改。
结果

当捡起或放下枪时，这些事件集便会调用。需要使用蓝图下一部分中的 bCanExplode 变量，防止用手枪敲击机器人时手枪在角色手中爆炸。