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03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Serialization/MatchedSerializers.md

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+# MatchedSerializers
+
+- **功能描述：** 只在NoExportTypes.h中使用，标明采用结构序列化器。是否支持文本导入导出
+
+- **使用位置：** UCLASS
+
+- **引擎模块：** Serialization
+
+- **元数据类型：** bool
+
+- **关联项：** 
+
+  UCLASS：[MatchedSerializers](../../Specifier/UCLASS/Serialization/MatchedSerializers/MatchedSerializers.md)
+
+- **常用程度：** 0
+
+```cpp
+if (!GetUnrealSourceFile().IsNoExportTypes())
+{
+	LogError(TEXT("The 'MatchedSerializers' class specifier is only valid in the NoExportTypes.h file"));
+}
+ParsedClassFlags |= CLASS_MatchedSerializers;
+```
+
+跟在Class中标记MatchedSerializers是等价的

03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/Serialization/SkipUCSModifiedProperties.md

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+# SkipUCSModifiedProperties
+
+- **功能描述：** 跳过序列化Component里某个属性
+- **使用位置：** UPROPERTY
+- **引擎模块：** Serialization
+- **元数据类型：** bool
+- **限制类型：** ActorComponent下的属性
+- **常用程度：** 0
+
+## 原理：
+
+只在ActorComponent.cpp里用到，感觉是用于跳过序列化某个属性。
+也只在UPrimitiveComponent 里的BodyInstance用到。物理的表示信息是运行时生成的，确实不需要序列化。但其实标一个Transient也就可以了，只能说是混乱的用法了。
+
+SimpleConstructionScript指的是这个组件是在Actor的蓝图面板里添加进去的，而不是再蓝图通过AddComponent里动态添加的。
+
+```cpp
+UCLASS(abstract, HideCategories=(Mobility, VirtualTexture), ShowCategories=(PhysicsVolume), MinimalAPI)
+class UPrimitiveComponent : public USceneComponent, public INavRelevantInterface, public IInterface_AsyncCompilation, public IPhysicsComponent
+{
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category=Collision, meta=(ShowOnlyInnerProperties, SkipUCSModifiedProperties))
+	FBodyInstance BodyInstance;
+}
+
+void UActorComponent::DetermineUCSModifiedProperties()
+{
+  	if (CreationMethod == EComponentCreationMethod::SimpleConstructionScript)
+    {
+   	 //TMap<UActorComponent*, TArray<FSimpleMemberReference>> AllUCSModifiedProperties;
+    	//把组件里和CDO不一样的属性存到AllUCSModifiedProperties里
+		class FComponentPropertySkipper : public FArchive
+		{
+		public:
+			FComponentPropertySkipper()
+				: FArchive()
+			{
+				this->SetIsSaving(true);
+
+				// Include properties that would normally skip tagged serialization (e.g. bulk serialization of array properties).
+				ArPortFlags |= PPF_ForceTaggedSerialization;
+			}
+
+			virtual bool ShouldSkipProperty(const FProperty* InProperty) const override
+			{
+				static const FName MD_SkipUCSModifiedProperties(TEXT("SkipUCSModifiedProperties"));
+				return (InProperty->HasAnyPropertyFlags(CPF_Transient)
+					|| !InProperty->HasAnyPropertyFlags(CPF_Edit | CPF_Interp)
+					|| InProperty->IsA<FMulticastDelegateProperty>()
+#if WITH_EDITOR
+					|| InProperty->HasMetaData(MD_SkipUCSModifiedProperties)
+#endif
+					);
+			}
+		} PropertySkipper;
+    
+        }
+    }
+```