https://docs.unrealengine.com/5.2/en-US/interfaces-in-unreal-engine/

1 纯c++ 接口  没有ufunction

#pragma once#include "CoreMinimal.h"
#include "UObject/Interface.h"
#include "ALWorldWeatherConfig.h"
#include "AL_WeatherInterface.generated.h"// This class does not need to be modified.
UINTERFACE(MinimalAPI)
class UAL_WeatherInterface : public UInterface
{GENERATED_BODY()
};/*** */
class SKYCREATORPLUGIN_API IAL_WeatherInterface
{GENERATED_BODY()// Add interface functions to this class. This is the class that will be inherited to implement this interface.
public://纯虚函数virtual void GetLevelWeatherPresetConfig(TSoftObjectPtr<UALWorldWeatherConfig>& PresetConfig) const = 0;
};UCLASS()
class ABOVELAND_API AALWorldSettings : public AWorldSettings, public IAL_WeatherInterface
{GENERATED_BODY()
public:UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "AL Weather")TSoftObjectPtr<UALWorldWeatherConfig> WeatherConfig;//interface override 必须有overridevirtual void GetLevelWeatherPresetConfig(TSoftObjectPtr<UALWorldWeatherConfig>& PresetConfig) const override;};//调用if (IAL_WeatherInterface* Interface = Cast<IAL_WeatherInterface>(InWorld.GetWorldSettings())){Interface->GetLevelWeatherPresetConfig(WorldWeatherConfig);}

2 纯c++ 有ufunction

UINTERFACE(MinimalAPI, BlueprintType)
class UALClimbItemInterface : public UInterface
{GENERATED_BODY()
};/*** */
class ABOVELAND_API IALClimbItemInterface
{GENERATED_BODY()// Add interface functions to this class. This is the class that will be inherited to implement this interface.
public:UFUNCTION(BlueprintNativeEvent, BlueprintCallable, Category = "ALClimbItemInterface")void CalculateClimbItemData();UFUNCTION(BlueprintNativeEvent, BlueprintCallable, Category = "ALClimbItemInterface")void CopyClimbItemData(UPARAM(ref) FClimbItemData& InOutRes,bool InOrOut);UFUNCTION(BlueprintNativeEvent, BlueprintCallable, Category = "ALClimbItemInterface")void ShowHook(bool IsShow);};UCLASS()
class ABOVELAND_API AALClimbStaticMeshActor : public AStaticMeshActor ,public IALClimbItemInterface
{GENERATED_BODY()
public:AALClimbStaticMeshActor();
public://必须带_Implementation 必须带overridevoid CalculateClimbItemData_Implementation() override;void CopyClimbItemData_Implementation(FClimbItemData& InOutRes, bool InOrOut) override;void ShowHook_Implementation(bool IsShow) override;};//调用IALClimbItemInterface::Execute_CopyClimbItemData(CurClimbItemActor, ClimbItemData, false);