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03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Object/MustBeLevelActor.md

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+# MustBeLevelActor
+
+- **使用位置：** UPROPERTY
+- **引擎模块：** Object Property
+- **元数据类型：** bool
+
+意思是这个必须是场景里的Actor，而不是LevelScriptActor的意思。
+
+触发时机在用箭头选择的当前选中actor的时候。
+
+## 源码中遇见：
+
+```cpp
+if (FObjectPropertyBase* ObjectProperty = CastField<FObjectPropertyBase>(Property))
+{
+	ObjectClass = ObjectProperty->PropertyClass;
+	bMustBeLevelActor = ObjectProperty->GetOwnerProperty()->GetBoolMetaData(TEXT("MustBeLevelActor"));
+	RequiredInterface = ObjectProperty->GetOwnerProperty()->GetClassMetaData(TEXT("MustImplement"));
+}
+```