UE4使用定时器-Toy模板网

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上面的文章中，我们创建了一个门，并且当人才上去的时候，门就会打开，当离开的时候，门就自动关闭了。大概但是我们希望当我们离开以后，至少还要有一段时间才能关闭，这时就用到了定时器。

定义一个定时器句柄

FTimerHandle switchTimer;

使用定时器

GetWorldTimerManager().SetTimer(switchTimer, this, &AFloorSwitch::closeTheDoor, 2.0);

第一个参数：把时间控制权交给谁，TimeHandle
第二个参数：哪个类的对象
第三个参数：时间到时执行的函数指针，（去执行closeTheDoor（）函数）
第四个参数：间隔多久（2s）去执行closeTheDoor（）函数
第五个参数： false - 只执行一次 true - 循环执行

// 清空
GetWorldTimerManager().ClearTimer(switchTimer);
// 暂停
GetWorldTimerManager().PauseTimer(switchTimer);
// 结束暂停
GetWorldTimerManager().UnPauseTimer(switchTimer);

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "FloorSwitch.generated.h"

UCLASS()
class FIRSTPROJECT_API AFloorSwitch : public AActor
{
	GENERATED_BODY()
	
public:	
	// Sets default values for this actor's properties
	AFloorSwitch();

	//触发盒子
	UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category="FloorSwitch")
	class UBoxComponent* traggerBox = nullptr;

	//地板开关
	UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = "FloorSwitch")
	class UStaticMeshComponent* floorSwitch = nullptr;

	//门
	UPROPERTY(VisibleAnywhere, BlueprintReadWrite, Category = "FloorSwitch")
	class UStaticMeshComponent* door = nullptr;


	UFUNCTION()
	void onBeginOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult&SweepResult);

	UFUNCTION()
	void onEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent*OtherComp, int32 OtherBodyIndex);

	UFUNCTION(BlueprintImplementableEvent, Category="FloorSwitch")
	void riseDoor();
	UFUNCTION(BlueprintImplementableEvent, Category = "FloorSwitch")
	void lowerDoor();

	//门的初始位置
	UPROPERTY(BlueprintReadWrite, Category = "FloorSwitch")
	FVector initDoorLocation;

	//地板开关的初始位置
	UPROPERTY(BlueprintReadWrite, Category = "FloorSwitch")
	FVector initFloorSwitchLocation;

	UFUNCTION(BlueprintImplementableEvent, Category = "FloorSwitch")
	void riseFloorSwitch();
	UFUNCTION(BlueprintImplementableEvent, Category = "FloorSwitch")
	void lowerFloorSwitch();

	UFUNCTION(BlueprintCallable, Category="FloorSwitch")
	void updateDoorLocation(float z);

	UFUNCTION(BlueprintCallable, Category = "FloorSwitch")
	void updateFloorSwitchLocation(float z);

private:
	FTimerHandle switchTimer;
	void closeTheDoor();

	bool bIsOnFloor = false;//是否站在地板开关上
protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

};

// Fill out your copyright notice in the Description page of Project Settings.


#include "FloorSwitch.h"
#include "Components/BoxComponent.h"

// Sets default values
AFloorSwitch::AFloorSwitch() {
	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
	PrimaryActorTick.bCanEverTick = true;

	traggerBox = CreateDefaultSubobject<UBoxComponent>(TEXT("TriggerBox"));
	RootComponent = traggerBox;

	traggerBox->SetCollisionEnabled(ECollisionEnabled::QueryOnly);//只检测碰撞事件
	traggerBox->SetCollisionObjectType(ECC_WorldStatic);//设置对象类型
	traggerBox->SetCollisionResponseToAllChannels(ECollisionResponse::ECR_Ignore);//忽略所有通道
	traggerBox->SetCollisionResponseToChannel(ECC_Pawn, ECR_Overlap);//对Pawn类型开放事件重叠事件

	traggerBox->SetBoxExtent(FVector(50.0, 50.0, 50.0));

	floorSwitch = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("FloorSwitch"));
	floorSwitch->SetupAttachment(GetRootComponent());

	door = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("Door"));
	door->SetupAttachment(GetRootComponent());

}

void AFloorSwitch::onBeginOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult) {
	UE_LOG(LogTemp, Warning, TEXT("AFloorSwitch::onBeginOverlap"));
	riseDoor();
	lowerFloorSwitch();

	bIsOnFloor = true;
}

void AFloorSwitch::onEndOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex) {
	UE_LOG(LogTemp, Warning, TEXT("AFloorSwitch::onEndOverlap"));
	bIsOnFloor = false;
	GetWorldTimerManager().SetTimer(switchTimer, this, &AFloorSwitch::closeTheDoor, 2.0);
}

void AFloorSwitch::updateDoorLocation(float z) {
	FVector newLocation = initDoorLocation;
	newLocation.Z += z;
	door->SetWorldLocation(newLocation);
}

void AFloorSwitch::updateFloorSwitchLocation(float z) {
	FVector newLocation = initFloorSwitchLocation;
	newLocation.Z += z;
	floorSwitch->SetWorldLocation(newLocation);
}

void AFloorSwitch::closeTheDoor() {
	if (!bIsOnFloor){
		riseFloorSwitch();
		lowerDoor();
	}
}

// Called when the game starts or when spawned
void AFloorSwitch::BeginPlay() {
	Super::BeginPlay();

	//绑定事件
	traggerBox->OnComponentBeginOverlap.AddDynamic(this, &AFloorSwitch::onBeginOverlap);
	traggerBox->OnComponentEndOverlap.AddDynamic(this, &AFloorSwitch::onEndOverlap);

	initDoorLocation = door->GetComponentLocation();
	initFloorSwitchLocation = floorSwitch->GetComponentLocation();
}

// Called every frame
void AFloorSwitch::Tick(float DeltaTime) {
	Super::Tick(DeltaTime);

}