UK2Node_AIMoveTo::UK2Node_AIMoveTo(const FObjectInitializer& ObjectInitializer)
    : Super(ObjectInitializer)
{
    ProxyFactoryFunctionName = GET_FUNCTION_NAME_CHECKED(UAIBlueprintHelperLibrary, CreateMoveToProxyObject);   //確定異步調(diào)用的函數(shù)名
    ProxyFactoryClass = UAIBlueprintHelperLibrary::StaticClass();                                               //包含異步函數(shù)實現(xiàn)的類
    ProxyClass = UAIAsyncTaskBlueprintProxy::StaticClass();                                                     //將會被實例化的類
}

從上述代碼中可以知道，AIMoveTo主要調(diào)用的函數(shù)為UAIBlueprintHelperLibrary類中的CreateMoveToProxyObject方法。

查看源碼，發(fā)現(xiàn)CreateMoveToProxyObject方法返回值的就是一個UAIAsyncTaskBlueprintProxy實例。

以下截取部分關鍵代碼進行分析（MyObj就是新建的UAIAsyncTaskBlueprintProxy實例）：

UAIAsyncTaskBlueprintProxy* UAIBlueprintHelperLibrary::CreateMoveToProxyObject(UObject* WorldContextObject, APawn* Pawn, FVector Destination, 
AActor* TargetActor, float AcceptanceRadius, bool bStopOnOverlap)
{
            ……
        FPathFollowingRequestResult ResultData = AIController->MoveTo(MoveReq);     //調(diào)用AIController相關函數(shù)進行尋路
        switch (ResultData.Code)
        {
        case EPathFollowingRequestResult::RequestSuccessful:
            MyObj->AIController = AIController;
            MyObj->AIController->ReceiveMoveCompleted.AddDynamic(MyObj, &UAIAsyncTaskBlueprintProxy::OnMoveCompleted);  //尋路請求完成后，觸發(fā)OnCompleted函數(shù)
            MyObj->MoveRequestId = ResultData.MoveId;
            break;
            ……
        }
            ……
    return MyObj;
}

再看 OnMoveCompleted 函數(shù)：該函數(shù)可觸發(fā)兩個多播委托 OnSuccess 和 OnFail，正好是 AIMoveTo 節(jié)點的兩個異步回調(diào)引腳名：

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);        //廣播事件OnSuccess
        }
        else
        {
            OnFail.Broadcast(MovementResult);           //廣播事件OnFail
            // ……
        }
    }
}

而這兩個委托都是在類 UAIAsyncTaskBlueprintProxy 中聲明的藍圖可分配委托：

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

總結：CreateMoveToProxyObject 函數(shù)實現(xiàn)尋路，UAIAsyncTaskBlueprintProxy 定義委托。

Unlua代碼實現(xiàn)

關鍵代碼:

function BTT_FuncName_C:ReceiveExecuteAI(OwnerController,ControlledPawn)
    ……
    --調(diào)用CreateMoveProxyObject函數(shù)實現(xiàn)尋路并返回UAIAsyncTaskBlueprintProxy實例
    local MoveResult = UE4.UAIBlueprintHelperLibrary.CreateMoveToProxyObject(ControlledPawn,ControlledPawn,DesLocation)      
    --在返回的實例中，綁定委托相關回調(diào)函數(shù)
    MoveResult.OnSuccess:Add(self,BTT_FuncName_C.OnAIMoveSuccess)
end
--實現(xiàn)回調(diào)函數(shù)
function BTT_FuncName_C:OnAIMoveSuccess(MovementResult)
    print("尋路成功")
    self:FinishExecute()
end

以上就是UE4 Unlua 調(diào)用AIMoveTo函數(shù)示例詳解的詳細內(nèi)容，更多關于UE4 Unlua 調(diào)用AIMoveTo的資料請關注腳本之家其它相關文章！

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