代码实现

方式一：

通过重写继承来的NotifyActorBeginOverlap，这更易于实现

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//Actor.h:
Public:
  /** 
  *Event when this actor overlaps another actor, for example a player     walking into a trigger.
  *For events when objects have a blocking collision, for example a player hitting a wall, see 'Hit' events.
  *@note Components on both this and the other Actor must have  bGenerateOverlapEvents set to true to generate overlap events.
*/
  virtual void NotifyActorBeginOverlap(AActor* OtherActor);

举例：

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//AFPSActor.h:
public:
    virtual void NotifyActorBeginOverlap(AActor* OtherActor) override;

//AFPSActor.cpp:
void AFPSObjectiveActor::NotifyActorBeginOverlap(AActor* OtherActor)
{
    Super::NotifyActorBeginOverlap(OtherActor);
    AFPSCharacter* Mycharacter = Cast<AFPSCharacter>(OtherActor);
    if (Mycharacter) {
      Destroy();
    }
}

方式二：

通过组件触发event：Comp->OnComponentBeginOverlap.AddDynamic(this, &AClass::Handlefunc);

其中处理函数自己创建，函数类型见下方举例部分。

光标放在OnComponentBeginOverlap上，按F12：

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UPROPERTY(BlueprintAssignable, Category="Collision")
FComponentBeginOverlapSignature OnComponentBeginOverlap;

光标放在FComponentBeginOverlapSignature上，按F12(Visual Studio，Go to Definition）：

这里声明了事件本身，相关的处理函数要对应后六个参数，将它们复制，变量名称和变量类型之间的逗号。

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/** Delegate for notification of start of overlap with a specific component */
DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_SixParams( FComponentBeginOverlapSignature, UPrimitiveComponent, OnComponentBeginOverlap, UPrimitiveComponent*, OverlappedComponent, AActor*, OtherActor, UPrimitiveComponent*, OtherComp, int32, OtherBodyIndex, bool, bFromSweep, const FHitResult &, SweepResult);

举例：

//绑定这类型的函数时，需将其标记为UFUNCTION，以便让虚幻后端明白该函数的含义及如何将其与事件相绑定

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//AFPSActor.h:
  UPROPERTY(VisibleAnywhere, Category = "Components")
  UBoxComponent* OverlapComp;

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

//AFPSActor.cpp:
OverlapComp = CreateDefaultSubobject<UBoxComponent>(TEXT("OverlapComp"));
OverlapComp->OnComponentBeginOverlap.AddDynamic(this, &AFPSExtractionZone::HandleOverlap);


void AFPSExtractionZone::HandleOverlap(UPrimitiveComponent* OverlappedComponent,
AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult) {
    //sth.
}