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03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Meta/AnimationGraph/OnEvaluate.md

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+# OnEvaluate
+
+- **使用位置：** UPROPERTY
+- **引擎模块：** AnimationGraph
+
+## 原理：
+
+在源码中发现，说明OnEvaluate已经放弃了。
+
+```cpp
+// Dynamic value that needs to be wired up and evaluated each frame
+	const FString& EvaluationHandlerStr = SourcePinProperty->GetMetaData(AnimGraphDefaultSchema->NAME_OnEvaluate);
+	FName EvaluationHandlerName(*EvaluationHandlerStr);
+	if (EvaluationHandlerName != NAME_None)
+	{
+		// warn that NAME_OnEvaluate is deprecated:
+		InCompilationContext.GetMessageLog().Warning(*LOCTEXT("OnEvaluateDeprecated", "OnEvaluate meta data is deprecated, found on @@").ToString(), SourcePinProperty);
+	}
+```