UE4Unlua调用异步蓝图节点AIMoveTo函数示例详解

UK2Node_AIMoveTo::UK2Node_AIMoveTo(const FObjectInitializer& ObjectInitializer)
    : Super(ObjectInitializer)
{
    ProxyFactoryFunctionName = GET_FUNCTION_NAME_CHECKED(UAIBlueprintHelperLibrary, CreateMoveToProxyObject);   //确定异步调用的函数名
    ProxyFactoryClass = UAIBlueprintHelperLibrary::StaticClass();                                               //包含异步函数实现的类
    ProxyClass = UAIAsyncTaskBlueprintProxy::StaticClass();                                                     //将会被实例化的类
}

UAIAsyncTaskBlueprintProxy* UAIBlueprintHelperLibrary::CreateMoveToProxyObject(UObject* WorldContextObject, APawn* Pawn, FVector Destination, 
AActor* TargetActor, float AcceptanceRadius, bool bStopOnOverlap)
{
            ……
        FPathFollowingRequestResult ResultData = AIController->MoveTo(MoveReq);     //调用AIController相关函数进行寻路
        switch (ResultData.Code)
        {
        case EPathFollowingRequestResult::RequestSuccessful:
            MyObj->AIController = AIController;
            MyObj->AIController->ReceiveMoveCompleted.ADDDynamic(MyObj, &UAIAsyncTaskBlueprintProxy::OnMoveCompleted);  //寻路请求完成后，触发OnCompleted函数
            MyObj->MoveRequestId = ResultData.MoveId;
            break;
            ……
        }
            ……
    return MyObj;
}

void UAIAsyncTaskBlueprintProxy::OnMoveCompleted(FAIRequestID RequestID, EPathFollowingResult::Type MovementResult)
{
    if (RequestID.IsEquivalent(MoveRequestId) && AIController.IsValid(true))
    {
        AIController->ReceiveMoveCompleted.RemoveDynamic(this, &UAIAsyncTaskBlueprintProxy::OnMoveCompleted);
        if (MovementResult == EPathFollowingResult::Success)
        {
            OnSuccess.Broadcast(MovementResult);        //广播事件OnSuccess
        }
        else
        {
            OnFail.Broadcast(MovementResult);           //广播事件OnFail
            // ……
        }
    }
}

UPROPERTY(BlueprintAssignable)
FOAISimpleDelegate    OnSuccess;
UPROPERTY(BlueprintAssignable)
FOAISimpleDelegate    OnFail;

function BTT_FuncName_C:ReceiveExecuteAI(OwnerController,ControlledPawn)
    ……
    --调用CreateMoveProxyObject函数实现寻路并返回UAIAsyncTaskBlueprintProxy实例
    local MoveResult = UE4.UAIBlueprintHelperLibrary.CreateMoveToProxyObject(ControlledPawn,ControlledPawn,DesLocation)      
    --在返回的实例中，绑定委托相关回调函数
    MoveResult.OnSuccess:Add(self,BTT_FuncName_C.OnAIMoveSuccess)
end
--实现回调函数
function BTT_FuncName_C:OnAIMoveSuccess(MovementResult)
    print("寻路成功")
    self:FinishExecute()
end