官方案例程序《Variables, Timers, and Events》的错误
官方案例程序《Variables, Timers, and Events》的错误一、缺包含文件：
#include "Runtime/Engine/Classes/Components/TextRenderComponent.h"
二、包含文件的位置：
应放在#include "Countdown.generated.h"之前！
本帖最后由 tzbm123456 于 2018-3-27 09:43 编辑
Countdown.h文件内容：
// Fill out your copyright notice in the Description page of Project Settings.
#pragma once
#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Runtime/Engine/Classes/Components/TextRenderComponent.h"
#include "Countdown.generated.h"
UCLASS()
class HOWTO_VTE_API ACountdown : public AActor
{
GENERATED_BODY()
public:
// Sets default values for this actor's properties
ACountdown();
protected:
// Called when the game starts or when spawned
virtual void BeginPlay() override;
public:
// Called every frame
virtual void Tick(float DeltaTime) override;
int32 CountdownTime;
UTextRenderComponent* CountdownText;
void UpdateTimerDisplay();
void AdvanceTimer();
void CountdownHasFinished();
FTimerHandle CountdownTimerHandle;
};
本帖最后由 tzbm123456 于 2018-3-27 09:44 编辑
Countdown.cpp文件内容：
// Fill out your copyright notice in the Description page of Project Settings.
#include "Countdown.h"
// Sets default values
ACountdown::ACountdown()
{
// Set this actor to call Tick() every frame.You can turn this off to improve performance if you don't need it.
PrimaryActorTick.bCanEverTick = false;
CountdownText = CreateDefaultSubobject<UTextRenderComponent>(TEXT("CountdownNumber"));
CountdownText->SetHorizontalAlignment(EHTA_Center);
CountdownText->SetWorldSize(150.0f);
RootComponent = CountdownText;
CountdownTime = 10;
}
// Called when the game starts or when spawned
void ACountdown::BeginPlay()
{
Super::BeginPlay();
UpdateTimerDisplay();
GetWorldTimerManager().SetTimer(CountdownTimerHandle, this, &ACountdown::AdvanceTimer, 1.0f, true);
}
// Called every frame
void ACountdown::Tick(float DeltaTime)
{
Super::Tick(DeltaTime);
}
void ACountdown::UpdateTimerDisplay()
{
CountdownText->SetText(FString::FromInt(FMath::Max(CountdownTime, 0)));
}
void ACountdown::AdvanceTimer()
{
--CountdownTime;
UpdateTimerDisplay();
if (CountdownTime < 1)
{
//We're done counting down, so stop running the timer.
GetWorldTimerManager().ClearTimer(CountdownTimerHandle);
CountdownHasFinished();
}
}
void ACountdown::CountdownHasFinished()
{
//Change to a special readout
CountdownText->SetText(TEXT("GO!"));
}
在蓝图中显现属性和事件
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